I am creating a custom Mesh with points to position an overlay screen in a 360 panorama using ConvexGeometry
var vertices:Array<Vector3> = [
new Vector3(-483.18945494559256, -21.248702500252314, 160.0899894624876),
new Vector3(-482.4577972469297, -25.581141422076243, -161.52168655050198),
new Vector3(-436.77666672599617, -205.92662314104163, 161.3256245628837),
new Vector3(-454.3073193376171, -222.87828173610987, 57.92799592915939),
new Vector3(-433.85443685376515, -220.1460046396674, -150.67149462410754)
];
const convexGeometry:ConvexGeometry = new ConvexGeometry( vertices );
const texture:Texture = new TextureLoader().load( './images/tactile.jpg' );
const material:MeshLambertMaterial = new MeshLambertMaterial( {map: texture } );
const mesh:Mesh = new Mesh( convexGeometry, material );
this.add( mesh );
And I have some problem with the texture size that does not match the mesh
Expected result:
expected result
Current display:
current display
Is there a way to make texture size matching the mesh size or do I am missing something?
Thanks for your help.
EDIT : I made a codepen here : link
Related
I am trying to change the color of my 3D model "behind" the png texture I set (which includes transparency).
I have done a lot of researches, and i finally found an example with a cube which actually works, but I can't understand how to make that with my gltf 3D model (not a BoxGeometry).
METHOD :
Define an array of two materials,
first one is my png texture with transparency = true;
second one is a basic material with its plain color (the color i will be able to change later...)
var materialBack = new THREE.MeshBasicMaterial({color: 0xfadce6});
var materialTxt = new THREE.MeshBasicMaterial({map: mytexture,transparent: true});
var materials = [materialBack, materialTxt];
It works perfect with a cube :
var geometry = new THREE.BoxBufferGeometry();
geometry.clearGroups();
geometry.addGroup( 0, Infinity, 0 );
geometry.addGroup( 0, Infinity, 1 );
var cube = new THREE.Mesh( geometry, materials );
Problem : I can't figure out how to do the same when my model is actually an imported GLTF, and not a "BoxBufferGeometry". It looks like we can't assign an array to o.material :
var loader = new THREE.GLTFLoader();
loader.load(mymodel.glb, function(gltf) {
gltf.scene.traverse((o) => {
if (o.isMesh) {
o.material = materials;
}
scene.add(gltf.scene);
});
I also tried to extract geometry from gltf, then create a new mesh, but without success :
var loader = new THREE.GLTFLoader();
loader.load(mymodel.glb, function(gltf) {
var geometry = gltf.scene.getObjectByName("name").geometry;
mymesh = new THREE.Mesh(geometry,materials);
scene.add(mymesh);
});
Can someone please help ?
I use some data to create a model in three.js. It can load texture, but with a weird problem. I load the texture in this way.
`function createMesh(geom, imageFile){
var loader = new THREE.TextureLoader();
texture = loader.load(imageFile);
var mat = new THREE.MeshLambertMaterial({
side: THREE.DoubleSide,
});
mat.map = texture;
var mesh = new THREE.Mesh(geom, mat);
return mesh;}
var geom = new THREE.Geometry();
geom.vertices = vertices;
geom.faces = faces;
geom.computeFaceNormals();
var myModel = createMesh(geom, './tex1.jpg');
scene.add(myModel);`
Here is the screenshot before the texture is loaded.
Here is the screenshot after the texture is loaded.
My texture file(2048*2048.jpg)
I have tested to load the texture in a common cube, and it works. So I can't figure out why the texture can't be loaded in my model. Any suggestions? Thank you very much!
For customized geometry in Three.js, we need to do UV mapping to define how texture is mapped to the geometry.
Firstly, load the texture by var material = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('texture.jpg') } );
Then here is how I did UV mapping:
create n arrarys, each corresponding to a sub-image of the texture and contains 4 points which define the boudaries of the sub-image. (0, 0) represents the lower left corner and (1, 1) represents the upper right corner.
clear the existed UV mapping by geometry.faceVertexUvs[0] = [];
Map the sub-image of the texture to each triangle face of the geometry.
geometry.faceVertexUvs[0][0] = [ sub_image_1[0], sub_image_1[1], sub_image_1[3] ];
geometry.faceVertexUvs[0][1] = [ sub_image_1[1], sub_image_1[2], sub_image_1[3] ];
Finally, mesh = new THREE.Mesh(geometry, material);
I'm very new with Three.js and I'm trying to make a ring:
http://www.websuvius.it/atma/myring/preview.html
I have a background texture ( the silver one ) and another one with a text.
I want the text only on the ring external face.
This is part of my code:
var loader = new THREE.OBJLoader( manager );
var textureLoader = new THREE.TextureLoader( manager );
loader.load( 'assets/3d/ring.obj', function ( event ) {
var object = event;
var geometry = object.children[ 0 ].geometry;
var materials = [];
var backgroundTexture = textureLoader.load('img/texture/silver.jpg');
backgroundTexture.flipY = false;
var background = new THREE.MeshBasicMaterial({
map: backgroundTexture,
color: 0xffffff
});
materials.push(background);
var customTexture = textureLoader.load('img/text.png');
customTexture.flipY = false;
var custom = new THREE.MeshBasicMaterial({
map: customTexture,
transparent: true,
opacity: 1,
color: 0xffffff
});
materials.push(custom);
mesh = THREE.SceneUtils.createMultiMaterialObject(geometry, materials);
mesh.position.y=-50;
scene.add(mesh);
}, onProgress, onError );
It is possible?
Thanks
The reason behind your issue appears to be in your .obj file. Judging from a quick glance at the texture coordinates stored in the file, the inside of the ring uses the same part of the texture image as the outside of the ring.
Increasing the transparent parts of the image won't help. Neither will the attempts to stop the texture from repeating. Those would help if the texture coordinates were larger than 1 but this is not your case unfortunately.
However, there are several solutions:
Split the object in a 3D modeling software to two objects - outside and inside of the ring - and apply the texture only to the first one.
Adjust the UV coordinates of the object in a 3D modeling software.
Adjust the UV coordinates of the vertices programmatically after loading the object to Three.JS
I need to apply a texture on a ExtrudeGeometry object.
The shape is a circle and the extrude path is composed of 2 vectors :
One for the top.
One for the bottom.
I didn't choose cylinderGeometry because I need to place top/bottom sections of my geometry at precise positions and because the geometry created will not be always purely vertical (like a oblique cylinder for example).
Here is a picture of a section (one top vector, one bottom vector and a shape extruded between these 2 vectors).
and a picture of the texture I'm trying to apply.
All I want to do is to wrap this picture on the vertical sides of my object just one time.
Here is my code :
var biVectors = [ new THREE.Vector3( this.startVector.x, this.startVector.y, this.startVector.z ) , new THREE.Vector3( this.endVector.x, this.endVector.y, this.endVector.z ) ];
var wellSpline = new THREE.SplineCurve3(biVectors);
var extrudeSettings = {
steps : 1,
material: 0,
extrudeMaterial: 1,
extrudePath : wellSpline
};
var pts = [];
for (var i = 0; i <= this.segments; i++) {
var theta = (i / this.segments) * Math.PI * 2;
pts.push( new THREE.Vector3(Math.cos(theta) * this.diameter , Math.sin(theta) * this.diameter, 0) );
}
var shape = new THREE.Shape( pts );
var geometry = new THREE.ExtrudeGeometry( shape, extrudeSettings );
var texture = THREE.ImageUtils.loadTexture( 'textures/sampleTexture2.jpg' );
texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
texture.flipY = false;
var material = new THREE.MeshBasicMaterial( { map: texture } );
var slice = new THREE.Mesh( geometry, material );
var faceNormals = new THREE.FaceNormalsHelper( slice );
console.log("face normals: ", faceNormals);
myCanvas.scene.add( faceNormals );
slice.parentObject = this;
myCanvas.scene.add( slice );
this.object3D = slice;
}
Now, as you can see, the mapping is not correct at all.
I've read a lot of information about this problem the last 3 days. But I'm running out of options as I'm new to THREE.JS.
I think I have to redefine the UV coordinates but I have no clue how to do this.
It seems that wrapping a texture on a cylinder like object is anything but easy in THREE.JS.
Can someone please help me on this issue ?
How do you find the size of a particle in Three.js?
With geometrys you can use the bounding box/sphere to calculate its size in three.js units. But a particle has no bounding box and I can't see of anyway to calulate its size.
Does anyone have any suggestions?
It depends what meaning of 'particle' you are dealing with. With a WebGLRenderer you would be referring to a vertex in a ParticleSystem, but with a CanvasRenderer you mean Particle (which is Canvas only). In terms of the ParticleSystem the material used to construct it has a size, like in the usual examples:
geometry = new THREE.Geometry();
for ( i = 0; i < 10000; i ++ ) {
var vertex = new THREE.Vector3(); // and set its location
geometry.vertices.push( vertex );
}
material = new THREE.ParticleBasicMaterial( {
size: 35, // This might be the size you are thinking of?
sizeAttenuation: false,
map: // Some THREE.Texture
});
particles = new THREE.ParticleSystem( geometry, material );
Then you can access the size, and modify it simply with
particles.material.size = newSize;
If you are creating a Particle for canvas, then it is very similar:
// Construct the particle with a material
var material = new THREE.ParticleBasicMaterial( {
map: new THREE.Texture( canvas ),
blending: THREE.AdditiveBlending
});
particle = new THREE.Particle( textMaterial );
// Just need to access the material to get the 'size'
var size = particle.material.size