Three.js:对象相交和着色器材质 [英] Three.js: Objects intersected and shader material

问题描述

我有一个场景，其中的对象使用Lambert材质相交，例如 jsFiddle .

I have a scene with objects intersected using Lambert material, like in this jsFiddle.

现在，我需要/想要将该平面的材质切换为Shader材质，并且该平面变成背景物体，例如此处.

Now I need/want to switch the material of that plane to a Shader material and the plane turns into a background thing, like here.

问题是，我可以在对象中使用不同的材质并且仍然保留相交效果吗?这是Three.js的限制，还是着色器的工作方式?还是我在渲染器/材质中缺少参数?

The question is, can I use different materials in objects and still preserve the intersection effect? Is this a Three.js limitation or this is how shaders works? Or am I missing a parameter in the renderer/material?

目前还不能选择将所有工作都转移到材质球材质上，以利用材质球.

At the moment is not an option no switch all my work to shader materials in order to take advantage of shaders.

这是我设置材料的方式:

This is how I set up the material:

var material1 = new THREE.ShaderMaterial( { 
    uniforms: {
        color: { type: "c", value: new THREE.Color( 0x22A8E7 ) }
    },
    vertexShader: document.getElementById( 'vertexShader' ).textContent, 
    fragmentShader: document.getElementById( 'fragmentShader' ).textContent, 
    opacity: 0.5, 
    transparent: true, 
} );

谢谢！

推荐答案

使用ShaderMaterial，您可以控制着色器glsl.因此，为了使logarithmicDepthBuffer正常工作，您需要向着色器添加四组代码.

With ShaderMaterial you control the shader glsl; so in order for logarithmicDepthBuffer to work you need to add four sets of code to your shaders.

代码在:

顶点着色器声明

https://github.com com/mrdoob/three.js/blob/master/src/renderers/shaders/ShaderChunk/logdepthbuf_pars_vertex.glsl

#ifdef USE_LOGDEPTHBUF

    #ifdef USE_LOGDEPTHBUF_EXT

        varying float vFragDepth;

    #endif

    uniform float logDepthBufFC;

#endif

顶点着色器主体

https://github.com com/mrdoob/three.js/blob/master/src/renderers/shaders/ShaderChunk/logdepthbuf_vertex.glsl

#ifdef USE_LOGDEPTHBUF

    gl_Position.z = log2(max( EPSILON, gl_Position.w + 1.0 )) * logDepthBufFC;

    #ifdef USE_LOGDEPTHBUF_EXT

        vFragDepth = 1.0 + gl_Position.w;

    #else

        gl_Position.z = (gl_Position.z - 1.0) * gl_Position.w;

    #endif

#endif

片段着色器声明

https://github.com. com/mrdoob/three.js/blob/master/src/renderers/shaders/ShaderChunk/logdepthbuf_pars_fragment.glsl

#ifdef USE_LOGDEPTHBUF

    uniform float logDepthBufFC;

    #ifdef USE_LOGDEPTHBUF_EXT

        #extension GL_EXT_frag_depth : enable
        varying float vFragDepth;

    #endif

#endif

片段着色器主体

https://github.com com/mrdoob/three.js/blob/master/src/renderers/shaders/ShaderChunk/logdepthbuf_fragment.glsl

#if defined(USE_LOGDEPTHBUF) && defined(USE_LOGDEPTHBUF_EXT)

    gl_FragDepthEXT = log2(vFragDepth) * logDepthBufFC * 0.5;

#endif

如果要在js中构建着色器，而不是直接从HTML中提取着色器，则可以将其包含在ShaderChunks中，例如THREE.ShaderChunk[ "logdepthbuf_pars_vertex" ]

If you are building the shaders in js, rather than pulling directly from the HTML then you can include these with ShaderChunks e.g. THREE.ShaderChunk[ "logdepthbuf_pars_vertex" ]

请参见 https://github.com /mrdoob/three.js/blob/master/src/renderers/shaders/ShaderLib.js 作为示例.

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