135 lines
5.9 KiB
HTML
135 lines
5.9 KiB
HTML
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>材质常量（Material Constants）</h1>
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<p class="desc">
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由这些常量定义的属性对所有的材质类型都生效，除了Texture Combine Operations只应用于
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[page:MeshBasicMaterial.combine MeshBasicMaterial]，[page:MeshLambertMaterial.combine MeshLambertMaterial]和[page:MeshPhongMaterial.combine MeshPhongMaterial]。<br />
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</p>
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<h2>面</h2>
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<code>
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THREE.FrontSide
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THREE.BackSide
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THREE.DoubleSide
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</code>
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<p>
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定义了哪一边的面将会被渲染 —— 正面，或是反面，还是两个面都渲染。
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默认值是[page:Constant FrontSide]（只渲染正面）。
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</p>
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<h2>混合模式</h2>
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<code>
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THREE.NoBlending
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THREE.NormalBlending
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THREE.AdditiveBlending
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THREE.SubtractiveBlending
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THREE.MultiplyBlending
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THREE.CustomBlending
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</code>
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<p>
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这些值控制着源和目标材质中，被发送到WebGLRenderer，来给WebGL使用的包含有RGB和Alpha数据的混合方程。<br />
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默认值是[page:Constant NormalBlending]。<br />
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请注意，[page:Constant CustomBlending]必须被设置为自定义混合方程（[page:CustomBlendingEquation Custom Blending Equations]）常量中的值。<br />
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请查看示例：[example:webgl_materials_blending materials / blending]。<br />
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</p>
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<h2>深度模式</h2>
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<code>
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THREE.NeverDepth
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THREE.AlwaysDepth
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THREE.LessDepth
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THREE.LessEqualDepth
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THREE.GreaterEqualDepth
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THREE.GreaterDepth
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THREE.NotEqualDepth
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</code>
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<p>
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材质使用这些深度函数来比较输入像素和缓冲器中Z-depth的值。
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如果比较的结果为true，则将绘制像素。<br />
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[page:Materials NeverDepth] 永远不返回true。<br />
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[page:Materials AlwaysDepth] 总是返回true。<br />
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[page:Materials LessDepth] 当输入像素Z-depth小于当前缓冲器Z-depth时，返回true。<br />
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[page:Materials LessEqualDepth] 为默认值，当输入像素Z-depth小于或等于当前缓冲器Z-depth时，返回true。<br />
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[page:Materials GreaterEqualDepth] 当输入像素Z-depth大于或等于当前缓冲器Z-depth时，返回true。 <br />
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[page:Materials GreaterDepth] 当输入像素Z-depth大于当前缓冲器Z-depth时，返回true。<br />
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[page:Materials NotEqualDepth] 当输入像素Z-depth不等于当前缓冲器Z-depth时，返回true。<br />
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</p>
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<h2>纹理结合操作</h2>
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<code>
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THREE.MultiplyOperation
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THREE.MixOperation
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THREE.AddOperation
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</code>
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<p>
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这些常量定义了物体表面颜色与环境贴图（如果存在的话）相结合的结果，
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用在[page:MeshBasicMaterial.combine MeshBasicMaterial]、[page:MeshLambertMaterial.combine MeshLambertMaterial]和[page:MeshPhongMaterial.combine MeshPhongMaterial]当中。<br />
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[page:Constant MultiplyOperation] 是默认值，它将环境贴图和物体表面颜色进行相乘。<br />
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[page:Constant MixOperation] 使用反射率来混和两种颜色。uses reflectivity to blend between the two colors.<br />
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[page:Constant AddOperation] 用于对两种颜色进行相加。</p>
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<h2>Stencil Functions</h2>
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<code>
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THREE.NeverStencilFunc
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THREE.LessStencilFunc
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THREE.EqualStencilFunc
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THREE.LessEqualStencilFunc
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THREE.GreaterStencilFunc
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THREE.NotEqualStencilFunc
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THREE.GreaterEqualStencilFunc
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THREE.AlwaysStencilFunc
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</code>
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<p>
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Which stencil function the material uses to determine whether or not to perform a stencil operation.<br />
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[page:Materials NeverStencilFunc] will never return true.<br />
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[page:Materials LessStencilFunc] will return true if the stencil reference value is less than the current stencil value.<br />
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[page:Materials EqualStencilFunc] will return true if the stencil reference value is equal to the current stencil value.<br />
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[page:Materials LessEqualStencilFunc] will return true if the stencil reference value is less than or equal to the current stencil value.<br />
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[page:Materials GreaterStencilFunc] will return true if the stencil reference value is greater than the current stencil value.<br />
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[page:Materials NotEqualStencilFunc] will return true if the stencil reference value is not equal to the current stencil value.<br />
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[page:Materials GreaterEqualStencilFunc] will return true if the stencil reference value is greater than or equal to the current stencil value.<br />
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[page:Materials AlwaysStencilFunc] will always return true.<br />
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</p>
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<h2>Stencil Operations</h2>
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<code>
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THREE.ZeroStencilOp
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THREE.KeepStencilOp
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THREE.ReplaceStencilOp
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THREE.IncrementStencilOp
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THREE.DecrementStencilOp
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THREE.IncrementWrapStencilOp
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THREE.DecrementWrapStencilOp
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THREE.InvertStencilOp
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</code>
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<p>
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Which stencil operation the material will perform on the stencil buffer pixel if the provided stencil function passes.<br />
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[page:Materials ZeroStencilOp] will set the stencil value to 0.<br />
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[page:Materials KeepStencilOp] will not change the current stencil value.<br />
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[page:Materials ReplaceStencilOp] will replace the stencil value with the specified stencil reference value.<br />
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[page:Materials IncrementStencilOp] will increment the current stencil value by 1.<br />
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[page:Materials DecrementStencilOp] will decrement the current stencil value by 1.<br />
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[page:Materials IncrementWrapStencilOp] will increment the current stencil value by 1. If the value increments past 255 it will be set to 0.<br />
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[page:Materials DecrementWrapStencilOp] will increment the current stencil value by 1. If the value decrements below 0 it will be set to 255.<br />
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[page:Materials InvertStencilOp] will perform a bitwise iversion of the current stencil value.<br />
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</p>
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<h2>源代码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]
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</p>
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</body>
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</html>
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