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<h1>材质常量（Material Constants）</h1>
<p class="desc">
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
[page:MeshBasicMaterial.combine MeshBasicMaterial]，[page:MeshLambertMaterial.combine MeshLambertMaterial]和[page:MeshPhongMaterial.combine MeshPhongMaterial]。<br />
</p>
<h2>面</h2>
<code>
THREE.FrontSide
THREE.BackSide
THREE.DoubleSide
</code>
<p>
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。
默认值是[page:Constant FrontSide]（只渲染正面）。
</p>
<h2>颜色</h2>
<code>
THREE.NoColors
THREE.FaceColors
THREE.VertexColors
</code>
<p>
[page:Constant NoColors] 是默认值，且会将材质的颜色应用到所有面。<br />
[page:Constant FaceColors] 根据每个[page:Face3 Face3]的[page:Color Color]值来对面进行着色。<br />
[page:Constant VertexColors] 根据每个 [page:Face3 Face3]的vertexColors（顶点颜色）值来对面进行着色。 这是一个包含有三个[page:Color Color]的数组，数组中每一项都对应着面中的每一个顶点。<br />
请查看示例：[example:webgl_geometry_colors geometry / colors]。
</p>
<h2>混合模式</h2>
<code>
THREE.NoBlending
THREE.NormalBlending
THREE.AdditiveBlending
THREE.SubtractiveBlending
THREE.MultiplyBlending
THREE.CustomBlending
</code>
<p>
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 />
默认值是[page:Constant NormalBlending]。<br />
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 />
请查看示例：[example:webgl_materials_blending materials / blending]。<br />
</p>
<h2>深度模式</h2>
<code>
THREE.NeverDepth
THREE.AlwaysDepth
THREE.LessDepth
THREE.LessEqualDepth
THREE.GreaterEqualDepth
THREE.GreaterDepth
THREE.NotEqualDepth
</code>
<p>
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。
如果比较的结果为true，则将绘制像素。<br />
[page:Materials NeverDepth] 永远不返回true。<br />
[page:Materials AlwaysDepth] 总是返回true。<br />
[page:Materials LessDepth] 当输入像素Z-depth小于当前缓冲器Z-depth时，返回true。<br />
[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 />
[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 />
[page:Materials GreaterDepth] 当输入像素Z-depth大于当前缓冲器Z-depth时，返回true。<br />
[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 />
</p>
<h2>纹理结合操作</h2>
<code>
THREE.MultiplyOperation
THREE.MixOperation
THREE.AddOperation
</code>
<p>
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，
用在[page:MeshBasicMaterial.combine MeshBasicMaterial]、[page:MeshLambertMaterial.combine MeshLambertMaterial]和[page:MeshPhongMaterial.combine MeshPhongMaterial]当中。<br />
[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 />
[page:Constant MixOperation] 使用反射率来混和两种颜色。uses reflectivity to blend between the two colors.<br />
[page:Constant AddOperation] 用于对两种颜色进行相加。</p>
<h2>Stencil Functions</h2>
<code>
THREE.NeverStencilFunc
THREE.LessStencilFunc
THREE.EqualStencilFunc
THREE.LessEqualStencilFunc
THREE.GreaterStencilFunc
THREE.NotEqualStencilFunc
THREE.GreaterEqualStencilFunc
THREE.AlwaysStencilFunc
</code>
<p>
Which stencil function the material uses to determine whether or not to perform a stencil operation.<br />
[page:Materials NeverStencilFunc] will never return true.<br />
[page:Materials LessStencilFunc] will return true if the stencil reference value is less than the current stencil value.<br />
[page:Materials EqualStencilFunc] will return true if the stencil reference value is equal to the current stencil value.<br />
[page:Materials LessEqualStencilFunc] will return true if the stencil reference value is less than or equal to the current stencil value.<br />
[page:Materials GreaterStencilFunc] will return true if the stencil reference value is greater than the current stencil value.<br />
[page:Materials NotEqualStencilFunc] will return true if the stencil reference value is not equal to the current stencil value.<br />
[page:Materials GreaterEqualStencilFunc] will return true if the stencil reference value is greater than or equal to the current stencil value.<br />
[page:Materials AlwaysStencilFunc] will always return true.<br />
</p>
<h2>Stencil Operations</h2>
<code>
THREE.ZeroStencilOp
THREE.KeepStencilOp
THREE.ReplaceStencilOp
THREE.IncrementStencilOp
THREE.DecrementStencilOp
THREE.IncrementWrapStencilOp
THREE.DecrementWrapStencilOp
THREE.InvertStencilOp
</code>
<p>
Which stencil operation the material will perform on the stencil buffer pixel if the provided stencil function passes.<br />
[page:Materials ZeroStencilOp] will set the stencil value to 0.<br />
[page:Materials KeepStencilOp] will not change the current stencil value.<br />
[page:Materials ReplaceStencilOp] will replace the stencil value with the specified stencil reference value.<br />
[page:Materials IncrementStencilOp] will increment the current stencil value by 1.<br />
[page:Materials DecrementStencilOp] will decrement the current stencil value by 1.<br />
[page:Materials IncrementWrapStencilOp] will increment the current stencil value by 1. If the value increments past 255 it will be set to 0.<br />
[page:Materials DecrementWrapStencilOp] will increment the current stencil value by 1. If the value decrements below 0 it will be set to 255.<br />
[page:Materials InvertStencilOp] will perform a bitwise iversion of the current stencil value.<br />
</p>
<h2>源代码</h2>
<p>
[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]
</p>
</body>
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