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I think showing a code example is the best. Therefore i have created a small example that shows the problem.
I want to create a buffer geometry in which each group has its own shader. although i always create a new instance in the material array, i cannot use the uniforms of the individual shaders independently. what i adjust in the uniform of one shader in the array always has the same effect on all other shaders in the material array.
Before i ask, i try to advance through research, but here i have reached a point where i can not get any further. Does anyone know why the individual shaders in the material array are dependent on each other and how to avoid this?
var camera, controls, scene, renderer, container;
var PI = Math.PI;
var clock = new THREE.Clock();
var plane;
var MAX_Planes = 100;
var velocity = [];
var geometry;
var test1, test2, test3;
function init() {
renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true} );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
//renderer.sortObjects = true;
container = document.getElementById('container');
renderer.setSize(container.clientWidth, container.clientHeight);
container.appendChild( renderer.domElement );
var aspect = container.clientWidth / container.clientHeight;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x000000 );
camera = new THREE.PerspectiveCamera( 45, container.clientWidth / container.clientHeight, 1, 100000 );
camera.position.set(0, 0, 4000);
controls = new THREE.OrbitControls( camera, renderer.domElement );
controls.enableZoom = true;
controls.enabled = true;
controls.target.set(0, 0, 0);
//---------------shaders---------------
var BasicVertexShader = `
void main() {
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`;
var BasicFragmentShader = `
void main() {
gl_FragColor = vec4(vec3(1.0, 1.0, 0.8), 1.0);
}`;
var VertexShader = `
varying vec3 sPos;
uniform vec3 pos;
uniform float stretch;
void main() {
float rotation = 0.0;
sPos = position;
vec3 scale;
scale.x = 1.0*stretch;
scale.y = 1.0*stretch;
scale.z = 1.0*stretch;
vec3 alignedPosition = vec3(position.x * scale.x, position.y * scale.y, 0.0);
vec3 rotatedPosition;
rotatedPosition.x = cos(rotation) * alignedPosition.x - sin(rotation) * alignedPosition.y;
rotatedPosition.y = sin(rotation) * alignedPosition.x + cos(rotation) * alignedPosition.y;
rotatedPosition.z = alignedPosition.z;
vec4 finalPosition;
finalPosition = modelViewMatrix * vec4( 0, 0, 0, 1.0 );
finalPosition.xyz += rotatedPosition;
finalPosition = projectionMatrix * finalPosition;
gl_Position = finalPosition;
// gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`;
var FragmentShader = `
varying vec3 sPos;
void main() {
vec3 nDistVec = normalize(sPos);
float dist = pow(sPos.x, 2.0) + pow(sPos.y, 2.0);
float magnitude = 1.0/dist * pow(4.0, 2.0);
// gl_FragColor = vec4(vec3(1.0, 1.0, 0.8), 1.0) * magnitude;
gl_FragColor = vec4(vec3(1.0, 1.0, 0.8), 1.0);
}`;
var uniform = {
stretch: {type: 'f', value: 1.0},
pos: { value: new THREE.Vector3(0,0,0) },
}
Shader = new THREE.ShaderMaterial( {
uniforms: uniform,
vertexShader: VertexShader,
fragmentShader: FragmentShader,
transparent: true,
depthTest: false,
depthWrite: false
});
//just for tests
var Shade = new THREE.ShaderMaterial( {
vertexShader: BasicVertexShader,
fragmentShader: BasicFragmentShader,
side:THREE.DoubleSide
});
//-------------------------------------------------
//create a plane: points, normals, uv
const vertices = [
{ pos: [-10, -10, 0], norm: [ 0, 0, 1], uv: [0, 1], },
{ pos: [ 10, -10, 0], norm: [ 0, 0, 1], uv: [1, 1], },
{ pos: [-10, 10, 0], norm: [ 0, 0, 1], uv: [0, 0], },
{ pos: [ 10, 10, 0], norm: [ 0, 0, 1], uv: [1, 0], },
];
const numVertices = vertices.length;
const positionNumComponents = 3;
const normalNumComponents = 3;
const uvNumComponents = 2;
//arrays for buffergeometry
const positions = new Float32Array(numVertices * positionNumComponents * MAX_Planes);
const normals = new Float32Array(numVertices * normalNumComponents * MAX_Planes);
const uvs = new Float32Array(numVertices * uvNumComponents * MAX_Planes);
//fill arrays with vertices
var posPointer = 0;
var nrmPointer = 0;
var uvPointer = 0;
for(var i = 0; i <= MAX_Planes; i++) {
var posNdx = 0;
var nrmNdx = 0;
var uvNdx = 0;
for (const vertex of vertices) {
positions.set(vertex.pos, posNdx + posPointer);
normals.set(vertex.norm, nrmNdx + nrmPointer);
uvs.set(vertex.uv, uvNdx + uvPointer);
posNdx += positionNumComponents;
nrmNdx += normalNumComponents;
uvNdx += uvNumComponents;
}
posPointer = i * posNdx;
nrmPointer = i * nrmNdx;
uvPointer = i * uvNdx;
}
//create buffergeometry and assign the attribut arrays
geometry = new THREE.BufferGeometry();
geometry.setAttribute('position', new THREE.BufferAttribute(positions, positionNumComponents));
geometry.setAttribute('normal', new THREE.BufferAttribute(normals, normalNumComponents));
geometry.setAttribute('uv', new THREE.BufferAttribute(uvs, uvNumComponents));
var ndx = 0;
var indices = [];
//instead 6 vertices for the both triangles of a plane i used 4, so reindication is neccessary
for(var i = 0; i < MAX_Planes; i++){
indices.push(ndx, ndx + 1, ndx + 2, ndx + 2, ndx + 1, ndx + 3);
ndx += 4;
}
geometry.setIndex(indices);
var materials = [];
geometry.clearGroups();
for(var i = 0; i < MAX_Planes; i++){
geometry.addGroup( 6*i, 6, i );
materials.push(Shader);
}
plane = new THREE.Mesh(geometry, materials);
scene.add(plane);
plane.material[0].uniforms.stretch.value = 2;
plane.material[1].uniforms.stretch.value = 3;
test1 = Object.keys(plane.material);
test2 = plane.material[0].uniforms.stretch.value; //why this returns 3 and not 2?
test3 = plane.material[1].uniforms.stretch.value;
//the goal is that each group has its own Shader without effecting the other ones
//----------------------velocity---------------------------
for(var i = 0; i < MAX_Planes; i++){
velocity[i] = new THREE.Vector3(
Math.random()*2-1,
Math.random()*2-1,
Math.random()*2-1);
}
}//-------End init----------
function animate() {
requestAnimationFrame( animate );
render();
}//-------End animate----------
function render() {
document.getElementById("demo1").innerHTML = test1;
document.getElementById("demo2").innerHTML = test2;
document.getElementById("demo3").innerHTML = test3;
for(var i = 0; i < MAX_Planes; i++){
for(var j = 0; j < 4; j++){
plane.geometry.attributes.position.array[i*12+3*j] = plane.geometry.attributes.position.array[i*12+3*j] + velocity[i].x;
plane.geometry.attributes.position.array[i*12+3*j+1] = plane.geometry.attributes.position.array[i*12+3*j+1] + velocity[i].y;
plane.geometry.attributes.position.array[i*12+3*j+2] = plane.geometry.attributes.position.array[i*12+3*j+2] + velocity[i].z;
}
}
plane.geometry.attributes.position.needsUpdate = true;
camera.updateMatrixWorld();
camera.updateProjectionMatrix();
renderer.render(scene, camera);
}//-------End render----------
You are pushing references to a single ShaderMaterial into every index of your materials array.
materials.push(Shader);
Because each index is a reference, changing the properties on the object in one index will naturally change the object in all other indices.
If you want each group to have its own properties, then you will need to provide a unique material to each index. You can still do this by only creating one original definition, then using Material.clone to create copies.
for(var i = 0; i < MAX_Planes; i++){
geometry.addGroup( 6*i, 6, i );
materials.push( Shader.clone() ); // creates a unique copy for each index
}
this did not leave me in peace and it occurred to me that if i prealocate the buffer geometry, i would have to do that with the shaders for each group. I would now have made this much more complicated than with ".clone ()". good that i checked again. Your advice works wonderfully. I have corrected the positioning update and that is exactly the result that i had in mind. Here is the customized code for anyone interested. I will now combine this with my particle emitter.
var camera, controls, scene, renderer, container;
var PI = Math.PI;
var clock = new THREE.Clock();
var plane;
var MAX_Planes = 2000;
var velocity = [];
var geometry;
function init() {
renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true} );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
//renderer.sortObjects = true;
container = document.getElementById('container');
renderer.setSize(container.clientWidth, container.clientHeight);
container.appendChild( renderer.domElement );
var aspect = container.clientWidth / container.clientHeight;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x000000 );
camera = new THREE.PerspectiveCamera( 45, container.clientWidth / container.clientHeight, 1, 100000 );
camera.position.set(0, 0, 4000);
controls = new THREE.OrbitControls( camera, renderer.domElement );
controls.enableZoom = true;
controls.enabled = true;
controls.target.set(0, 0, 0);
//---------------shader---------------
var VertexShader = `
varying vec3 sPos;
uniform vec3 pos;
uniform float stretch;
void main() {
float rotation = 0.0;
sPos = position;
vec3 scale;
scale.x = 1.0*stretch;
scale.y = 1.0*stretch;
scale.z = 1.0*stretch;
vec3 alignedPosition = vec3(position.x * scale.x, position.y * scale.y, 0.0);
vec3 rotatedPosition;
rotatedPosition.x = cos(rotation) * alignedPosition.x - sin(rotation) * alignedPosition.y;
rotatedPosition.y = sin(rotation) * alignedPosition.x + cos(rotation) * alignedPosition.y;
rotatedPosition.z = alignedPosition.z;
vec4 finalPosition;
finalPosition = modelViewMatrix * vec4( pos, 1.0 );
finalPosition.xyz += rotatedPosition;
finalPosition = projectionMatrix * finalPosition;
gl_Position = finalPosition;
}`;
var FragmentShader = `
varying vec3 sPos;
void main() {
vec3 nDistVec = normalize(sPos);
float dist = pow(sPos.x, 2.0) + pow(sPos.y, 2.0);
float magnitude = 1.0/dist * pow(3.0, 2.0);
float alpha = 1.0;
if(magnitude < 0.01){
alpha = 0.0;
}
gl_FragColor = vec4(vec3(1.0, 1.0, 0.8), alpha) * magnitude;
// gl_FragColor = vec4(vec3(1.0, 1.0, 0.8), 1.0);
}`;
var uniform = {
stretch: {type: 'f', value: 1.0},
pos: { value: new THREE.Vector3(0,0,0) },
}
var Shader = new THREE.ShaderMaterial( {
uniforms: uniform,
vertexShader: VertexShader,
fragmentShader: FragmentShader,
transparent: true,
depthTest: false,
depthWrite: false
});
//-------------------------------------------------
//create a plane: points, normals, uv
const vertices = [
{ pos: [-20, -20, 0], norm: [ 0, 0, 1], uv: [0, 1], },
{ pos: [ 20, -20, 0], norm: [ 0, 0, 1], uv: [1, 1], },
{ pos: [-20, 20, 0], norm: [ 0, 0, 1], uv: [0, 0], },
{ pos: [ 20, 20, 0], norm: [ 0, 0, 1], uv: [1, 0], },
];
const numVertices = vertices.length;
const positionNumComponents = 3;
const normalNumComponents = 3;
const uvNumComponents = 2;
//arrays for buffergeometry
const positions = new Float32Array(numVertices * positionNumComponents * MAX_Planes);
const normals = new Float32Array(numVertices * normalNumComponents * MAX_Planes);
const uvs = new Float32Array(numVertices * uvNumComponents * MAX_Planes);
//fill arrays with vertices
var posPointer = 0;
var nrmPointer = 0;
var uvPointer = 0;
for(var i = 0; i <= MAX_Planes; i++) {
var posNdx = 0;
var nrmNdx = 0;
var uvNdx = 0;
for (const vertex of vertices) {
positions.set(vertex.pos, posNdx + posPointer);
normals.set(vertex.norm, nrmNdx + nrmPointer);
uvs.set(vertex.uv, uvNdx + uvPointer);
posNdx += positionNumComponents;
nrmNdx += normalNumComponents;
uvNdx += uvNumComponents;
}
posPointer = i * posNdx;
nrmPointer = i * nrmNdx;
uvPointer = i * uvNdx;
}
//create buffergeometry and assign the attribut arrays
geometry = new THREE.BufferGeometry();
geometry.setAttribute('position', new THREE.BufferAttribute(positions, positionNumComponents));
geometry.setAttribute('normal', new THREE.BufferAttribute(normals, normalNumComponents));
geometry.setAttribute('uv', new THREE.BufferAttribute(uvs, uvNumComponents));
var ndx = 0;
var indices = [];
//instead 6 vertices for the both triangles of a plane i used 4, so reindication is neccessary
for(var i = 0; i < MAX_Planes; i++){
indices.push(ndx, ndx + 1, ndx + 2, ndx + 2, ndx + 1, ndx + 3);
ndx += 4;
}
geometry.setIndex(indices);
var materials = [];
geometry.clearGroups();
for(var i = 0; i < MAX_Planes; i++){
geometry.addGroup( 6*i, 6, i );
materials.push(Shader.clone());
}
plane = new THREE.Mesh(geometry, materials);
scene.add(plane);
//----------------------velocity---------------------------
for(var i = 0; i < MAX_Planes; i++){
velocity[i] = new THREE.Vector3(
Math.random()*2-1,
Math.random()*2-1,
Math.random()*2-1);
}
}//-------End init----------
function animate() {
requestAnimationFrame( animate );
render();
}//-------End animate----------
var loop = 0;
function render() {
loop = loop + 0.5;
for(var i = 0; i < MAX_Planes; i++){
var pos = new THREE.Vector3(0, 0, 0);
pos.x += velocity[i].x*loop;
pos.y += velocity[i].y*loop;
pos.z += velocity[i].z*loop;
plane.material[i].uniforms.pos.value = pos;
}
plane.geometry.attributes.position.needsUpdate = true;
camera.updateMatrixWorld();
camera.updateProjectionMatrix();
renderer.render(scene, camera);
}//-------End render----------
I set 2000 rectangles here and am pleasantly surprised at how smoothly the code runs. Even with 5000 rectangles everything went smoothly, even though each rectangle has its own shader. buffer geometries are really cool.
Thank you TheJim01
without your advice i would have preinitialized all shaders in a for loop. Such as vertexshader[i], fragmentshader[i], uniforms[i], Shader[i]. Using
".clone()" is of course much better 👍
demo link
//vertexShader
attribute float percent;
varying float vPercent;
void main() {
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_Position = projectionMatrix * mvPosition;
gl_PointSize = 10.0;
vPercent = percent;
}
//fragmentShader
varying float vPercent;
void main() {
gl_FragColor = vec4( vec3(0.0), vPercent );
}
let points = [];
for(let i = 0; i < 1000; i++) {
points.push(new THREE.Vector3(i / 1000, 1, 0));
}
let geometry = new THREE.BufferGeometry().setFromPoints(points);
let percents = new Float32Array(1000);
for(let i = 0; i < 1000; i++) {
percents[i] = i / 1000;
}
geometry.addAttribute('percent', new THREE.BufferAttribute(percents, 1));
let line = new THREE.Points(geometry,
new THREE.ShaderMaterial({
vertexShader: shader_content["vertexShader"],
fragmentShader: shader_content["fragmentShader"],
vertexColors: THREE.VertexColors,
transparent: true
})
);
scene.add(line);
Rotate the scene, points are all black at some degrees. THREE.js 109.
Is it a bug or it is just what it supposed to be?
Screenshots may explain better.
all black picture
normal picture
What you see is a depth sorting issue that can be avoid by setting depthWrite of your shader material to false. The points do not flicker anymore and you always see the expected result (which actually corresponds to your black picture).
I have simple point cloud shader, which renders points as circles on screen.
vertexShader:
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform vec3 cameraPosition;
uniform sampler2D texture;
uniform vec2 mouse;
uniform vec2 resolution;
attribute vec3 position;
attribute float radius;
attribute vec3 color;
varying vec3 vColor;
void main() {
vColor = color;
vec3 pos = position;
vec4 projected = projectionMatrix * modelViewMatrix * vec4(pos, 1.0);
gl_Position = projected;
gl_PointSize = radius;
}
fraqShader:
precision mediump float;
varying vec3 vColor;
uniform sampler2D texture;
uniform float useColor;
uniform vec2 mouse;
uniform vec2 resolution;
void main() {
float mx = mouse.x / resolution.x;
float my = mouse.y / resolution.y;
float d = sqrt((gl_PointCoord.x - mx)*(gl_PointCoord.x - mx) + (gl_PointCoord.y - mx)*(gl_PointCoord.y - mx));
if (useColor == 1.) {
gl_FragColor = vec4(vColor, 1.0);
} else {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
gl_FragColor = gl_FragColor * texture2D(texture, gl_PointCoord);
if(d < 0.1) { gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0); }
}
The question is: Is possible to make a mouse interaction with these circles, I mean if the distance from current mouse position is less than point radius then the color would be different?
I have tried to set mouse.x and mouse.y to event_.clientX and event_.clinetY, then pass it to the shader trying to calculate distance:
float mx = mouse.x / resolution.x;
float my = mouse.y / resolution.y;
float d = sqrt((gl_PointCoord.x - mx)*(gl_PointCoord.x - mx) + (gl_PointCoord.y - mx)*(gl_PointCoord.y - mx));
But it doesn't work. Is there any solutions?/
gl_FragCoord.xy contains the window coordinates of the fragment. The lower left is (0,0) and the upper right is the width and height of the viewport in pixels.
Probably you have to flip the y coordinate of the mouse coordinates, because at screen coordinates the upper left is (0, 0) and the bottom right is the width and height of the window:
vec2 mc = vec2(mouse.x, u_resolution.y - mouse.y);
float d = length((mc - gl_FragCoord.xy) / u_resolutuon.xy);
var circularPoint = 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";
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 10);
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0xEEEEEE, 1.0);
document.body.appendChild(renderer.domElement);
var controls = new THREE.OrbitControls(camera, renderer.domElement);
var N = 2560;
var pallete = ["#FF6138", "#FFFF9D", "#BEEB9F", "#79BD8F", "#00A388"];
var verts = [], colors = [], rad = [], size = [], id = [], enabled = [];
for (let i = 0; i < N; i++) {
verts.push(getXYZ().multiplyScalar(5));
size.push(0.25 + Math.random() * 1.25);
rad.push(size[size.length - 1] * 1.0E-1 );
colors.push.apply(colors, randomRGB());
enabled.push(1);
var indx = new THREE.Color().setHex((i + 1));
id.push(indx.r, indx.g, indx.b);
}
var geometry = new THREE.BufferGeometry().setFromPoints(verts);
geometry.addAttribute("color", new THREE.BufferAttribute(new Float32Array(colors), 3));
geometry.addAttribute("id", new THREE.BufferAttribute(new Float32Array(id), 3));
geometry.addAttribute("size", new THREE.BufferAttribute(new Float32Array(size), 1));
geometry.addAttribute("rad", new THREE.BufferAttribute(new Float32Array(rad), 1));
geometry.addAttribute("enabled", new THREE.BufferAttribute(new Float32Array(enabled), 1));
var material = new THREE.ShaderMaterial({
uniforms: {
texture: {
value: new THREE.TextureLoader().load(circularPoint)
},
ori: {
value: new THREE.Vector3()
},
dir: {
value: new THREE.Vector3()
},
scale: {
value: window.innerHeight / 2
}
},
vertexShader: document.getElementById('vertexShader').textContent,
fragmentShader: document.getElementById('fragmentShader').textContent,
alphaTest: 0.9
})
var last_id = 0;
material.extensions.fragDepth = true;
material.extensions.drawBuffers = true;
var points = new THREE.Points(geometry, material);
scene.add(points);
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
var inverseMatrix = new THREE.Matrix4();
var ray = new THREE.Ray();
pickingScene = new THREE.Scene();
pickingTexture = new THREE.WebGLRenderTarget(window.innerWidth, window.innerHeight);
pickingTexture.texture.minFilter = THREE.LinearFilter;
pickingScene.add(points.clone());
renderer.domElement.addEventListener("mousemove", onMouseMove, false);
function onMouseMove(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
inverseMatrix.getInverse(points.matrixWorld);
ray.copy(raycaster.ray).applyMatrix4(inverseMatrix);
material.uniforms.ori.value = ray.origin;
material.uniforms.dir.value = ray.direction;
renderer.render(pickingScene, camera, pickingTexture);
var pixelBuffer = new Uint8Array(4);
renderer.readRenderTargetPixels(
pickingTexture, event.clientX, pickingTexture.height - event.clientY,
1, 1, pixelBuffer);
var id = (pixelBuffer[0] << 16) | (pixelBuffer[1] << 8) | (pixelBuffer[2]);
if(id < N){
last_id = id;
console.log("highlighted node: " + id);
for(var i = 0; i < N; i++){ if(i != (id)) { enabled[i] = 0.0; } }
points.geometry.attributes.enabled.needsUpdate = true;
}else if(id != last_id){
for(var i = 0; i < N; i++){ enabled[i] = 1.0; }
points.geometry.attributes.enabled.needsUpdate = true;
}
}
renderer.setAnimationLoop(() => { renderer.render(scene, camera) });
function getXYZ(){
var n = 1E1;
var rho = Math.random();
var theta = Math.random() * Math.PI * 2;
var phi = Math.random() * Math.PI * 2;
var x = rho * Math.cos(phi) * Math.sin(theta);
var y = rho * Math.sin(phi) * Math.sin(theta);
var z = rho * Math.cos(theta);
return new THREE.Vector3(x, y, z);
}
function randomRGB() {
var i = Math.floor(Math.random() * 5);
var hex = pallete[i];
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? [
parseInt(result[1], 16) / 255,
parseInt(result[2], 16) / 255,
parseInt(result[3], 16) / 255
] : null;
}
body {
overflow: hidden;
margin: 0;
}
<script src="https://cdn.jsdelivr.net/npm/three#0.98.0/build/three.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three#0.98.0/examples/js/controls/OrbitControls.js"></script>
<script type='x-shader/x-vertex' id='vertexShader'>
uniform vec3 ori;
uniform vec3 dir;
attribute float rad;
attribute float size;
attribute vec3 color;
uniform float scale;
attribute float enabled;
attribute vec3 id;
varying vec3 vColor;
vec3 closestPointToPoint() {
vec3 target = position - ori;
float distance = dot(target, dir);
return dir * distance + ori;
}
void main() {
vColor = color;
if (length(position - closestPointToPoint()) < rad) if(enabled == 1.) { vColor = id; }
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( scale / -mvPosition.z );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type='x-shader/x-fragment' id='fragmentShader'>
varying vec3 vColor;
uniform sampler2D texture;
void main() {
gl_FragColor = vec4(vColor, 1.);
gl_FragColor = gl_FragColor * texture2D(texture, gl_PointCoord);
if (gl_FragColor.a < 0.1) discard;
}
</script>
That's the result I was looking for, but any tweaks are welcome.
Thanks to prisoner849, it's mainly his code.
Code demonstrating issue
(comment/uncomment out the gl_Position lines in the vertex shader)
var scene;
var book;
var shaderMaterial;
var renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setClearColor(0x000000);
document.body.appendChild(renderer.domElement);
var camera = new THREE.PerspectiveCamera(55, 1, 0.1, 40000);
window.onresize = function () {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
};
window.onresize();
scene = new THREE.Scene();
camera.position.z = 25;
camera.position.y = 15;
scene.add(camera);
var grid = new THREE.GridHelper(100, 10);
scene.add(grid);
var controls = new THREE.OrbitControls(camera);
controls.damping = 0.2;
var lettersPerSide = 16;
function createGlpyhSheet() {
var fontSize = 64;
var c = document.createElement('canvas');
c.width = c.height = fontSize * lettersPerSide;
var ctx = c.getContext('2d');
ctx.font = fontSize + 'px Monospace';
var i = 0;
for (var y = 0; y < lettersPerSide; y++) {
for (var x = 0; x < lettersPerSide; x++, i++) {
var ch = String.fromCharCode(i);
ctx.fillText(ch, x * fontSize, -(8 / 32) * fontSize + (y + 1) * fontSize);
}
}
var tex = new THREE.Texture(c);
tex.flipY = false;
tex.needsUpdate = true;
return tex;
}
function createLabels(textArrays, positions) {
//console.log(textArrays, positions);
var master_geometry = new THREE.Geometry();
for (var k = 0; k < textArrays.length; k++) {
var geo = new THREE.Geometry();
geo.dynamic = true;
var str = textArrays[k];
var vec = positions[k];
//console.log(shaderMaterial);
//console.log('str is', str, 'vec is', vec);
var j = 0,
ln = 0;
for (i = 0; i < str.length; i++) {
//console.log('creating glyph', str[i]);
var code = str.charCodeAt(i);
var cx = code % lettersPerSide;
var cy = Math.floor(code / lettersPerSide);
var oneDotOne = .55;
geo.vertices.push(
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 0.05, 0).add(vec),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 0.05, 0).add(vec),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 1.05, 0).add(vec),
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 1.05, 0).add(vec));
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
var face = new THREE.Face3(i * 4 + 0, i * 4 + 1, i * 4 + 2);
geo.faces.push(face);
face = new THREE.Face3(i * 4 + 0, i * 4 + 2, i * 4 + 3);
geo.faces.push(face);
var ox = (cx + 0.05) / lettersPerSide;
var oy = (cy + 0.05) / lettersPerSide;
var off = 0.9 / lettersPerSide;
geo.faceVertexUvs[0].push([
new THREE.Vector2(ox, oy + off),
new THREE.Vector2(ox + off, oy + off),
new THREE.Vector2(ox + off, oy)]);
geo.faceVertexUvs[0].push([
new THREE.Vector2(ox, oy + off),
new THREE.Vector2(ox + off, oy),
new THREE.Vector2(ox, oy)]);
if (code == 10) {
ln--;
j = 0;
} else {
j++;
}
}
// i can only get this working with merge.
// Building one giant geometry doesn't work for some reason
master_geometry.merge(geo);
}
console.log(shaderMaterial);
shaderMaterial.attributes.labelpos.needsUpdate = true;
book = new THREE.Mesh(
master_geometry,
shaderMaterial);
//book.doubleSided = true;
scene.add(book);
}
var uniforms = {
map: {
type: "t",
value: createGlpyhSheet()
}
};
var attributes = {
labelpos: {
type: 'v3',
value: []
}
};
shaderMaterial = new THREE.ShaderMaterial({
attributes: attributes,
uniforms: uniforms,
vertexShader: document.querySelector('#vertex').textContent,
fragmentShader: document.querySelector('#fragment').textContent
});
shaderMaterial.transparent = true;
shaderMaterial.depthTest = false;
strings = [];
vectors = [];
var sizeOfWorld = 100;
var halfSize = sizeOfWorld * 0.5;
for (var i = 0; i < 500; i++) {
strings.push('test' + i);
var vector = new THREE.Vector3();
vector.x = Math.random() * sizeOfWorld - halfSize;
vector.y = Math.random() * sizeOfWorld - halfSize;
vector.z = Math.random() * sizeOfWorld - halfSize;
vectors.push(vector);
}
console.log('creating labels');
createLabels(strings, vectors);
function animate() {
controls.update();
renderer.render(scene, camera);
requestAnimationFrame(animate, renderer.domElement);
}
animate();
html {
background-color: #ffffff;
}
* {
margin: 0;
padding: 0;
}
<script src="http://threejs.org/build/three.min.js"></script>
<script src="http://threejs.org/examples/js/controls/OrbitControls.js"></script>
<script id="vertex" type="text/x-glsl-vert">
varying vec2 vUv;
attribute vec3 labelpos;
void main() {
vUv = uv;
// standard gl_Position. Labels stay in the correct place, but do not billboard.
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
// this is the billboarding position as described by:
// http://stackoverflow.com/questions/22053932/three-js-billboard-vertex-shader
//gl_Position = projectionMatrix * (modelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0) + vec4(position.x, position.y, 0.0, 0.0));
// this gets a little closer
//gl_Position = projectionMatrix * (modelViewMatrix * vec4(0.0, 0.0, position.z, 1.0) + vec4(position.x, position.y, 0.0, 0.0));
}
</script>
<script id="fragment" type="text/x-glsl-frag">
varying vec2 vUv;
uniform sampler2D map;
void main() {
vec4 diffuse = texture2D(map, vUv);
vec4 letters = mix(diffuse, vec4(1.0, 1.0, 1.0, diffuse.a), 1.0);
gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) * letters;
}
</script>
I need help billboarding labels in my scene. My final scene will have hundreds of labels which I want to face the camera. I cannot figure out a way of doing this via a single mesh geometry. I've tried a few different gl_Position methods to get the billboarding look:
// standard gl_Position. Labels stay in the correct place, but do not billboard.
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
// this is the billboarding position as described by:
// http://stackoverflow.com/questions/22053932/three-js-billboard-vertex-shader
gl_Position = projectionMatrix * (modelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0) + vec4(position.x, position.y, 0.0, 0.0));
// this gets a little closer
gl_Position = projectionMatrix * (modelViewMatrix * vec4(0.0, 0.0, position.z, 1.0) + vec4(position.x, position.y, 0.0, 0.0));
My thinking was to send a shader attribute to each vertex to assist with the billboarding calculation, so that's why I have a label_pos attribute in the vertex shader.
I can get the exact look and feel I want if each label (made up of characters) is added to the scene separately. Unfortunately this results in too many draw calls per render loop, hence the reason for adding them all to a single geometry.
Any assistance on this would be greatly appreciated, thanks.
I think you want
gl_Position = projectionMatrix *
(modelViewMatrix * vec4(labelpos, 1) +
vec4(position.xy, 0, 0));
and you need to not add in the position to the vertices
geo.vertices.push(
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 0.05, 0),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 0.05, 0),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 1.05, 0),
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 1.05, 0));
Otherwise you'd be putting in the position twice.
Because all your labels are in the same mesh then there's only 1 draw call which means you won't get a different location for each label unless you pass it in (which you were in labelpos but you weren't using it)
In which case modelViewMatrix * vec4(0,0,0,1) is the same as just saying modelViewMatrix[3] All you're doing is getting the translation of the model that contains all the labels. That would work if each label was a separate mesh and had its own matrix but since you've put them all in one mesh it won't work.
Your fix was the pass in the location of each label in a separate attribute which you had already included, you just needed to use it.
modelViewMatrix * vec4(labelpos, 1)
gets you the root of the label
vec4(position.x, position.y, 0.0, 0.0)
adds in the corners in view space
var scene;
var book;
var shaderMaterial;
var renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setClearColor(0x000000);
document.body.appendChild(renderer.domElement);
var camera = new THREE.PerspectiveCamera(55, 1, 0.1, 40000);
window.onresize = function () {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
};
window.onresize();
scene = new THREE.Scene();
camera.position.z = 25;
camera.position.y = 15;
scene.add(camera);
var grid = new THREE.GridHelper(100, 10);
scene.add(grid);
var controls = new THREE.OrbitControls(camera);
controls.damping = 0.2;
var lettersPerSide = 16;
function createGlpyhSheet() {
var fontSize = 64;
var c = document.createElement('canvas');
c.width = c.height = fontSize * lettersPerSide;
var ctx = c.getContext('2d');
ctx.font = fontSize + 'px Monospace';
var i = 0;
for (var y = 0; y < lettersPerSide; y++) {
for (var x = 0; x < lettersPerSide; x++, i++) {
var ch = String.fromCharCode(i);
ctx.fillText(ch, x * fontSize, -(8 / 32) * fontSize + (y + 1) * fontSize);
}
}
var tex = new THREE.Texture(c);
tex.flipY = false;
tex.needsUpdate = true;
return tex;
}
function createLabels(textArrays, positions) {
//console.log(textArrays, positions);
var master_geometry = new THREE.Geometry();
for (var k = 0; k < textArrays.length; k++) {
var geo = new THREE.Geometry();
geo.dynamic = true;
var str = textArrays[k];
var vec = positions[k];
//console.log(shaderMaterial);
//console.log('str is', str, 'vec is', vec);
var j = 0,
ln = 0;
for (i = 0; i < str.length; i++) {
//console.log('creating glyph', str[i]);
var code = str.charCodeAt(i);
var cx = code % lettersPerSide;
var cy = Math.floor(code / lettersPerSide);
var oneDotOne = .55;
geo.vertices.push(
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 0.05, 0),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 0.05, 0),
new THREE.Vector3(j * oneDotOne + 1.05, ln * oneDotOne + 1.05, 0),
new THREE.Vector3(j * oneDotOne + 0.05, ln * oneDotOne + 1.05, 0));
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
shaderMaterial.attributes.labelpos.value.push(vec);
var face = new THREE.Face3(i * 4 + 0, i * 4 + 1, i * 4 + 2);
geo.faces.push(face);
face = new THREE.Face3(i * 4 + 0, i * 4 + 2, i * 4 + 3);
geo.faces.push(face);
var ox = (cx + 0.05) / lettersPerSide;
var oy = (cy + 0.05) / lettersPerSide;
var off = 0.9 / lettersPerSide;
geo.faceVertexUvs[0].push([
new THREE.Vector2(ox, oy + off),
new THREE.Vector2(ox + off, oy + off),
new THREE.Vector2(ox + off, oy)]);
geo.faceVertexUvs[0].push([
new THREE.Vector2(ox, oy + off),
new THREE.Vector2(ox + off, oy),
new THREE.Vector2(ox, oy)]);
if (code == 10) {
ln--;
j = 0;
} else {
j++;
}
}
// i can only get this working with merge.
// Building one giant geometry doesn't work for some reason
master_geometry.merge(geo);
}
console.log(shaderMaterial);
shaderMaterial.attributes.labelpos.needsUpdate = true;
book = new THREE.Mesh(
master_geometry,
shaderMaterial);
//book.doubleSided = true;
scene.add(book);
}
var uniforms = {
map: {
type: "t",
value: createGlpyhSheet()
}
};
var attributes = {
labelpos: {
type: 'v3',
value: []
}
};
shaderMaterial = new THREE.ShaderMaterial({
attributes: attributes,
uniforms: uniforms,
vertexShader: document.querySelector('#vertex').textContent,
fragmentShader: document.querySelector('#fragment').textContent
});
shaderMaterial.transparent = true;
shaderMaterial.depthTest = false;
strings = [];
vectors = [];
var sizeOfWorld = 100;
var halfSize = sizeOfWorld * 0.5;
for (var i = 0; i < 500; i++) {
strings.push('test' + i);
var vector = new THREE.Vector3();
vector.x = Math.random() * sizeOfWorld - halfSize;
vector.y = Math.random() * sizeOfWorld - halfSize;
vector.z = Math.random() * sizeOfWorld - halfSize;
vectors.push(vector);
}
console.log('creating labels');
createLabels(strings, vectors);
function animate() {
controls.update();
renderer.render(scene, camera);
requestAnimationFrame(animate, renderer.domElement);
}
animate();
html {
background-color: #ffffff;
}
* {
margin: 0;
padding: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/69/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/4862f5f1111346a957ac3e0cb0858be1568d0e03/examples/js/controls/OrbitControls.js"></script>
<script id="vertex" type="text/x-glsl-vert">
varying vec2 vUv;
attribute vec3 labelpos;
void main() {
vUv = uv;
gl_Position = projectionMatrix *
(modelViewMatrix * vec4(labelpos, 1) +
vec4(position.xy, 0, 0));
}
</script>
<script id="fragment" type="text/x-glsl-frag">
varying vec2 vUv;
uniform sampler2D map;
void main() {
vec4 diffuse = texture2D(map, vUv);
vec4 letters = mix(diffuse, vec4(1.0, 1.0, 1.0, diffuse.a), 1.0);
gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) * letters;
}
</script>
It is also worth looking at how it is done in Three.js and their SpriteMaterial: sprite_vert.glsl
Here is an annotated snippet:
// optional: pass 2D rotation angle as an uniform
uniform float rotation;
// optional: pass 2D center point as an uniform
uniform vec2 center;
// optional: use this define to scale the model according to distance from the camera
#define USE_SIZEATTENUATION
// [skipped includes]
void main() {
// discard rotation and scale
vec4 mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );
// extract model's scale
vec2 scale;
scale.x = length( vec3( modelMatrix[ 0 ].x, modelMatrix[ 0 ].y, modelMatrix[ 0 ].z ) );
scale.y = length( vec3( modelMatrix[ 1 ].x, modelMatrix[ 1 ].y, modelMatrix[ 1 ].z ) );
// if not defined, keep model the same size regardless of distance from the camera
#ifndef USE_SIZEATTENUATION
bool isPerspective = isPerspectiveMatrix( projectionMatrix );
if ( isPerspective ) scale *= - mvPosition.z;
#endif
// if center is not passed as uniform, create vec2 center = vec2(0.0);
// aligned with the camera [and scaled]
vec2 alignedPosition = ( position.xy - ( center - vec2( 0.5 ) ) ) * scale;
// if rotation is not passed as uniform, skip the next block
// rotate 2D
vec2 rotatedPosition;
rotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;
rotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;
// billboard
mvPosition.xy += rotatedPosition;
gl_Position = projectionMatrix * mvPosition;
// [skipped includes]
}
I'm creating a cube full of spheres. So I'm using a particle system. It's all working well until I try to apply a shader material to each of the particles. I've pretty much used the example at http://threejs.org/examples/#webgl_custom_attributes_particles3.
It is working, but what I'm trying to do now is add lighting to the scene using directional lighting. That's where I'm not getting anywhere. I have no experience in GLSL and am just copying and pasting at the moment, testing the waters. Any help would be great.
Here's what I have so far.
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec4 ca;
varying vec4 vColor;
void main() {
vColor = ca;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 150.0 / length( mvPosition.xyz ) );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform sampler2D texture;
varying vec4 vColor;
void main() {
vec4 outColor = texture2D( texture, gl_PointCoord );
if ( outColor.a < 0.5 ) discard;
gl_FragColor = outColor * vec4( color * vColor.xyz, 1.0 );
float depth = gl_FragCoord.z / gl_FragCoord.w;
const vec3 fogColor = vec3( 0.0 );
float fogFactor = smoothstep( 200.0, 700.0, depth );
gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
}
</script>
and in my js:
(function addSpheres() {
var cube = new THREE.Object3D();
scene.add(cube);
var totalSpheres = 3840; //15*16*16
var particles = new THREE.Geometry();
var attributes = {
size: { type: 'f', value: [] },
ca: { type: 'c', value: [] }
};
var uniforms = {
amplitude: { type: "f", value: 1.0 },
color: { type: "c", value: new THREE.Color(0xffffff) },
texture: { type: "t", value: THREE.ImageUtils.loadTexture("textures/sprites/ball.png") }
};
uniforms.texture.value.wrapS = uniforms.texture.value.wrapT = THREE.RepeatWrapping;
var shaderMaterial = new THREE.ShaderMaterial({
uniforms: uniforms,
attributes: attributes,
vertexShader: document.getElementById('vertexshader').textContent,
fragmentShader: document.getElementById('fragmentshader').textContent,
});
shaderMaterial.lights = true;
var n = 20, n2 = n / 2;
var particle;
for (var i = -7; i < 9; i++) {
for (var j = -7; j < 9; j++) {
for (var k = -7; k < 8; k++) {
var pX = i * n - n2;
var pY = j * n - n2;
var pZ = k * n - n2;
particle = new THREE.Vector3(pX, pY, pZ);
particles.vertices.push(particle);
}
}
}
particleSystem = new THREE.ParticleSystem(particles, shaderMaterial);
particleSystem.dynamic = true;
// custom attributes
var vertices = particleSystem.geometry.vertices;
var values_size = attributes.size.value;
var values_color = attributes.ca.value;
for (var v = 0; v < vertices.length; v++) {
attributes.size.value[v] = 55;
attributes.ca.value[v] = new THREE.Color(0xffffff);
attributes.size.needsUpdate = true;
attributes.ca.needsUpdate = true;
}
cube.add(particleSystem);
scene.matrixAutoUpdate = false;
})();
Thanks in advance.
John.