I'm mapping a texture of dimensions 300 x 250 to a Mesh that is 600 x 20. The texture are being scaled down, distorting the image. Anyway to prevent this?
Ideally, I want to map the texture at 300 X 20, "cutting" away at 20 and above
My code is as follows.
var floorTx = THREE.ImageUtils.loadTexture( './walltile/floorTx.jpg' );
floorTx.wrapS = floorTx.wrapT = THREE.RepeatWrapping;
floorTx.repeat.set(2, 2);
var floorMat = new THREE.MeshPhongMaterial( { map: floorTx, specular: 0x050505, shininess: 100});
var floor = new THREE.Mesh(cube, floorMat );
floor.castShadow = true;
floor.receiveShadow = true;
floor.name = "floor";
floor.dynamic = true;
scene.add( floor );
The key is to set the texture's repeat property according to the size of the mesh.
floorTx.repeat.set(meshWidth / textureWidth, meshHeight / textureHeight);
Related
I'm currently working with a directionnal ligth for my scene. A small character can move around. All shadows works. But if I start to go a bit further with the avatar, the shadows don't work anymore on it. I think it's may come from the angle of the light but I can't change it. I can draw a square around the shadow/non-shadow area.
Here is my code. Huge numbers were here for me to test things
const dirLight = new THREE.DirectionalLight( 0xffffff, 1 );
dirLight.color.setHSL( 0.1, 1, 0.95 );
dirLight.position.set( - 1, 1.75, 1 );
dirLight.position.multiplyScalar( 30 );
dirLight.distance = 1200;
dirLight.focus = 1200;
dirLight.angle = Math.PI / 1;
scene.add( dirLight );
dirLight.castShadow = true;
dirLight.shadow.mapSize.width = 2048;
dirLight.shadow.mapSize.height = 2048;
const d = 100;
dirLight.shadow.camera.left = - d;
dirLight.shadow.camera.right = d;
dirLight.shadow.camera.top = d;
dirLight.shadow.camera.bottom = - d;
dirLight.shadow.camera.far = 35000;
dirLight.shadow.bias = - 0;
const dirLightHelper = new THREE.DirectionalLightHelper( dirLight, 10 );
scene.add( dirLightHelper );
Here is the code of the ground that recive shadows
const groundGeo = new THREE.PlaneBufferGeometry( 10000, 10000 );
const groundMat = new THREE.MeshLambertMaterial( { color: 0xffffff } );
groundMat.color.setHSL( 0.095, 1, 0.75 );
const ground = new THREE.Mesh( groundGeo, groundMat );
ground.position.y = - 33;
ground.rotation.x = - Math.PI / 2;
ground.receiveShadow = true;
scene.add( ground );
I reused a huge part of the code provided by the ThreeJS example with the flamingo https://threejs.org/examples/?q=light#webgl_lights_hemisphere
Here is also a link to an imgur where I just put some picture to see the shadows
https://imgur.com/a/MGrc5cw
Thanks
If your shadows are working within a limited area, then it must be that your character is walking beyond the frustum of the shadow-camera.
To create directional shadows, you create an orthographic camera and assign its dimensions with .left, .right, .top, .bottom, in this case your camera is has 100 in each direction. When your character walks beyond those 200 units, it is outside the shadow camera, and it no longer receives shadows.
You should add a CameraHelper to the light shadow to let you see the space within its view frustum, as seen in the DirectionalLightShadow code sample
const helper = new THREE.CameraHelper( dirLight.shadow.camera );
scene.add( helper );
Maybe you could have the shadow camera follow the character so he'll always be inside of it.
My image texture is positioned relative to the center of 3d space instead of mesh and I don't quite understand what determines its size.
Here is example showing how the same image is positioned on different meshes:
https://imgur.com/glHE97L
I'd like the image be in the center of the mesh and it's size set similar as 'contain' in css.
The mesh is flat plane created using ShapeBufferGeometry:
const shape = new THREE.Shape( edgePoints );
const geometry = new THREE.ShapeBufferGeometry( shape );
To see any image I have to set:
texture.repeat.set(0.001, 0.001);
Not sure if that matters but after creating the mesh I than set its position and rotation:
mesh.position.copy( position[0] );
mesh.rotation.set( rotation[0], rotation[1], rotation[2] );
I've tried setting those:
mesh.updateMatrixWorld( true );
mesh.geometry.computeBoundingSphere();
mesh.geometry.verticesNeedUpdate = true;
mesh.geometry.elementsNeedUpdate = true;
mesh.geometry.morphTargetsNeedUpdate = true;
mesh.geometry.uvsNeedUpdate = true;
mesh.geometry.normalsNeedUpdate = true;
mesh.geometry.colorsNeedUpdate = true;
mesh.geometry.tangentsNeedUpdate = true;
texture.needsUpdate = true;
I've played with wrapS / wrapT and offset.
I've checked UV's - I don't yet fully understand this concept but it seems fine. Example of UV for one mesh (I understand those are XY coordinates and they seem to reflect the actual corners of my mesh):
uv: Float32BufferAttribute
array: Float32Array(8)
0: -208
1: 188
2: 338
3: 188
4: 338
5: 12
6: -208
7: 12
I've tried setting:
texture.repeat.set(imgHeight/geometryHeight/1000, imgWidth/geometryWidth/1000);
This is how THREE.ShapeGeometry() computes UV coordinate:
https://github.com/mrdoob/three.js/blob/e622cc7890e86663011d12ec405847baa4068515/src/geometries/ShapeGeometry.js#L157
But you can re-compute them, to put in range [0..1].
Here is an example, click the button to re-compute uvs of the shape geometry:
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 10);
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var grid = new THREE.GridHelper(10, 10);
grid.rotation.x = Math.PI * 0.5;
scene.add(grid);
var points = [
new THREE.Vector2(0, 5),
new THREE.Vector2(-5, 4),
new THREE.Vector2(-3, -3),
new THREE.Vector2(2, -5),
new THREE.Vector2(5, 0)
];
var shape = new THREE.Shape(points);
var shapeGeom = new THREE.ShapeBufferGeometry(shape);
var shapeMat = new THREE.MeshBasicMaterial({
map: new THREE.TextureLoader().load("https://threejs.org/examples/textures/uv_grid_opengl.jpg")
});
var mesh = new THREE.Mesh(shapeGeom, shapeMat);
scene.add(mesh);
btnRecalc.addEventListener("click", onClick);
var box3 = new THREE.Box3();
var size = new THREE.Vector3();
var v3 = new THREE.Vector3(); // for re-use
function onClick(event) {
box3.setFromObject(mesh); // get AABB of the shape mesh
box3.getSize(size); // get size of that box
var pos = shapeGeom.attributes.position;
var uv = shapeGeom.attributes.uv;
for (let i = 0; i < pos.count; i++) {
v3.fromBufferAttribute(pos, i);
v3.subVectors(v3, box3.min).divide(size); // cast world uvs to range 0..1
uv.setXY(i, v3.x, v3.y);
}
uv.needsUpdate = true; // set it to true to make changes visible
}
renderer.setAnimationLoop(() => {
renderer.render(scene, camera);
});
body {
overflow: hidden;
margin: 0;
}
<script src="https://threejs.org/build/three.min.js"></script>
<button id="btnRecalc" style="position: absolute;">Re-calculate UVs</button>
I'm working on a visualization that uses a height map to create a 3d terrain, and want to add some markers for locations of cities on the map. I'm guessing some sort of raycaster and intersectObject might do it, but I'm lost as to how to place a marker directly on the surface of the terrain. For instance, I know that a city is at (640, 480) in the pixel units of my texture, so I'm doing something like:
// This is the terrain, loaded from a PNG of the digital elevation model
var planeGeo = new THREE.PlaneGeometry( bumpTexture.image.width, bumpTexture.image.height, 600, 450 );
var plane = new THREE.Mesh( planeGeo, customMaterial );
plane.rotation.x = -Math.PI / 2;
plane.position.y = 0;
scene.add( plane );
// At (640, 480) of the image, there should be a marker directly on top of the mesh.
var cube = new THREE.Mesh( new THREE.CubeGeometry( 20, 20, 20 ), new THREE.MeshNormalMaterial() );
cube.position.x = 640;
cube.position.y = 0;
cube.position.z = 480;
scene.add(cube);
raycaster.setFromCamera(cube, camera );
var intersects = raycaster.intersectObject(plane);
console.log(raycaster, intersects);
// no intersects???
Any suggestions, Threejs wizards?
I was playing with webGL and ThreeJS, then I've got the following issue:
Textures with large images gets pixelated when seen from distance.
Check the example: http://jsfiddle.net/4qTR3/1/
Below is the code:
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 10, 7000);
var light = new THREE.PointLight(0xffffff);
light.position.set(0, 150, 100);
scene.add(light);
var light2 = new THREE.AmbientLight(0x444444);
scene.add(light2);
var renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var geometry = new THREE.PlaneGeometry(500, 500, 10, 10);
//I use different textures in my project
var texture = new THREE.ImageUtils.loadTexture(TEST_IMAGE);
var textureBack = new THREE.ImageUtils.loadTexture(TEST_IMAGE);
textureBack.anisotropy = renderer.getMaxAnisotropy();
texture.anisotropy = renderer.getMaxAnisotropy();
//Filters
texture.magFilter = THREE.NearestFilter;
texture.minFilter = THREE.LinearMipMapLinearFilter;
textureBack.magFilter = THREE.NearestFilter;
textureBack.minFilter = THREE.LinearMipMapLinearFilter;
var materials = [
new THREE.MeshLambertMaterial({
transparent: true,
map: texture,
side: THREE.FrontSide
}),
new THREE.MeshLambertMaterial({
transparent: true,
map: textureBack,
side: THREE.BackSide
})];
for (var i = 0, len = geometry.faces.length; i < len; i++) {
var face = geometry.faces[i].clone();
face.materialIndex = 1;
geometry.faces.push(face);
geometry.faceVertexUvs[0].push(geometry.faceVertexUvs[0][i].slice(0));
}
planeObject = new THREE.Mesh(geometry, new THREE.MeshFaceMaterial(materials));
planeObject.overdraw = true;
planeObject.position.z = -5000;
scene.add(planeObject);
camera.position.z = 1000;
(function render() {
requestAnimationFrame(render);
planeObject.rotation.y += 0.02;
renderer.render(scene, camera);
})();
If the image of the texture has got text in it, the text becomes very pixelated with poor quality.
How can I fix this?
In order to not get pixelated you need to use mips but WebGL can't generate mips for non-power-of-2 textures. Your texture is 800x533, neither of those is a power of 2.
a couple of options
1) Scale the picture offline to powers of 2 like 512x512 or 1024x512
2) Scale the picture at runtime before making a texture.
Load the image yourself, once loaded make a canvas that is power-of-2. call drawImage(img, 0, 0, canvas.width, canvas.height) to scale the image into the canvas. Then load the canvas into a texture.
You also probably want to change your mag filtering from NearestFilter to LinearFilter.
Note: (1) is the better option. (2) takes time on the user's machine, uses more memory, and you have no guarantee what the quality of the scaling will be.
Example here.
I have a texture applied to a mesh I can change the offset with
mesh.material.map.offset.set
I can change the scaling with
mesh.material.repeat.set
so my question is, how can I rotate texture inside a plane?
Example:
From This:
To this
Thanks.
use 2D canvas as a texture
demo:
https://dl.dropboxusercontent.com/u/1236764/temp/stackoverflow_20130525/index.html
example code
var camera, scene, renderer, mesh;
var width = window.innerWidth;
var height = window.innerHeight;
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 30, width / height, 1, 1000 );
camera.position.z = 100;
renderer = new THREE.WebGLRenderer();
renderer.setSize( width, height );
document.body.appendChild( renderer.domElement );
var img = new Image();
img.onload = createMeshThenRender;
img.src = 'img.jpg';
function createMeshThenRender () {
var imgWidth = imgHeight = 256;
var mapCanvas = document.createElement( 'canvas' );
mapCanvas.width = mapCanvas.height = 256;
// document.body.appendChild( mapCanvas );
var ctx = mapCanvas.getContext( '2d' );
ctx.translate( imgWidth / 2, imgHeight / 2 );
ctx.rotate( Math.PI / 4 );
ctx.translate( -imgWidth / 2, -imgHeight / 2 );
ctx.drawImage( img, 0, 0, imgWidth, imgHeight );
var texture = new THREE.Texture( mapCanvas );
texture.needsUpdate = true;
mesh = new THREE.Mesh(
new THREE.PlaneGeometry( 50, 50, 1, 1 ),
new THREE.MeshBasicMaterial( {
map : texture
} )
);
scene.add( mesh );
renderer.render( scene, camera );
}
three.js does not have a UV editing utility, so you either have to edit the geometry.faceVertexUvs manually, or rotate your image in an image editing program. I'd suggest the latter.
three.js r.58
three.js r85
For those looking to actually "rotate UVs" on a Plane sitting in XY plane (default plane) using a ShapeBufferGeometry or PlaneBufferGeometry.
var planeGeo = new THREE.PlaneBufferGeometry(24,24);
var planeMesh = new THREE.Mesh(planeGeo, new THREE.MeshBasicMaterial({map: yourTexture}));
scene.add(planeMesh);
rotateUVonPlanarBufferGeometry(45, planeMesh);
function rotateUVonPlanarBufferGeometry(rotateInDeg, mesh){
if(rotateInDeg != undefined && mesh){
var degreeInRad = THREE.Math.degToRad(rotateInDeg);
var tempGeo = mesh.geometry.clone();
var geo;
if(tempGeo instanceof THREE.BufferGeometry){
geo = new THREE.Geometry().fromBufferGeometry(tempGeo);
}else{
console.log('regular geometry currently not supported in this method, but can be if code is modified, so use a buffer geometry');
return;
}
// rotate the geo on Z-axis
// which will rotate the vertices accordingly
geo.applyMatrix(new THREE.Matrix4().makeRotationZ(degreeInRad));
// loop through the vertices which should now have been rotated
// change the values of UVs based on the new rotated vertices
var index = 0;
geo.vertices.forEach(function(v){
mesh.geometry.attributes.uv.setXY( index, v.x, v.y );
index++;
});
mesh.geometry.attributes.uv.needsUpdate = true;
}
}
three.js r121
In the newer version of the three.js, you can directly set rotation and rotation center of texture.
var texture = new THREE.Texture( ... );
texture.rotation = Math.PI/4;
texture.center = new Vector2d(0.5, 0.5); // center of texture.
The above solutions were not good to me, a little bit old. That's simple solution worked for me (Three.js 125)
imgData = canvasCtx.getImageData(0, 0, canvasElement.width, canvasElement.height);
texture = new THREE.DataTexture( imgData.data, canvasElement.width, canvasElement.height, THREE.SRGB );
texture.rotation = Math.PI;
texture.center = new THREE.Vector2(0.5, 0.5); // center of texture.
mymaterial = new THREE.MeshBasicMaterial({
map: texture,
alphaTest: 0.5,
transparent: true,
side: THREE.DoubleSide,
});