着色器中的Three.js纹理

Question

I could not load texture to my shader material, only what I see are just black dot. This is my shader.js

THREE.ShaderLib['cloud'] = {

    uniforms: {
        texture: { type: "t", value: THREE.ImageUtils.loadTexture("img/cloud.png") }
    },

    vertexShader: [
        "varying vec2 vUv;",
        "void main() {",
            "vUv = uv;",
            "gl_PointSize = 8.0;",
            "gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);",
        "}",
    ].join("\n"),

    fragmentShader: [
            "varying vec2 vUv;",
            "uniform sampler2D texture;",
            "void main() {",
                "gl_FragColor = texture2D(texture, vUv);",
            "}",
    ].join("\n")
};

and this is how I'm trying to load and use it:

var cloudShader = THREE.ShaderLib["cloud"];
var uniforms = THREE.UniformsUtils.clone(cloudShader.uniforms);

var texture = THREE.ImageUtils.loadTexture("img/cloud.png", undefined, function () {

   uniforms.texture.value = texture;
   texture.needsUpdate = true;

   var _material = new THREE.ShaderMaterial({
      fragmentShader: cloudShader.fragmentShader,
      vertexShader: cloudShader.vertexShader,
      uniforms: uniforms                   
   });                    
   _material.uniforms.texture.value.needsUpdate = true;
   var _geometry = new THREE.Geometry();
   _geometry.vertices.push(new THREE.Vector3(0, 0, 0));
   var _mesh = new THREE.Points(_geometry, _material);
   scene.add(_mesh);

 });

As You can see I'm trying to set update texture value two times, before and after material is created. It's really simpy example but I have no idea why it is not working in the way that I'm using it. There is no errors in debug console.

I'm using THREE.Points class, because I'm using it to generate clouds as a particle groups.

Thanks in advance for any help.

Answer 1

So, after some time I have found a solution for this specific problem. I need to move my uniforms from shader.js directly to place where i'm creating shader material. This is enough to fix problem with my texture, but still I don't know why previous code doesn't work. Working shader material looks like this:

 var _material = new THREE.ShaderMaterial({
      fragmentShader: cloudShader.fragmentShader,
      vertexShader: cloudShader.vertexShader,
      uniforms: uniforms: {
        texture: { type: "t", value: THREE.ImageUtils.loadTexture("img/cloud.png") }
      },
 });