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]。
		
		THREE.FrontSide
		THREE.BackSide
		THREE.DoubleSide
		
		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)。
		THREE.NoColors
		THREE.FaceColors
		THREE.VertexColors
		
		
		[page:Constant NoColors] 是默认值,且会将材质的颜色应用到所有面。
		[page:Constant FaceColors] 根据每个[page:Face3 Face3]的[page:Color Color]值来对面进行着色。
		[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。
		请查看示例:[example:webgl_geometry_colors geometry / colors]。
		
		THREE.NoBlending
		THREE.NormalBlending
		THREE.AdditiveBlending
		THREE.SubtractiveBlending
		THREE.MultiplyBlending
		THREE.CustomBlending
		
		
			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。
			默认值是[page:Constant NormalBlending]。
			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。
			请查看示例:[example:webgl_materials_blending materials / blending]。
		
		THREE.NeverDepth
		THREE.AlwaysDepth
		THREE.LessDepth
		THREE.LessEqualDepth
		THREE.GreaterEqualDepth
		THREE.GreaterDepth
		THREE.NotEqualDepth
		
		
			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。
		[page:Materials NeverDepth] 永远不返回true。
		[page:Materials AlwaysDepth] 总是返回true。
		[page:Materials LessDepth] 当输入像素Z-depth小于当前缓冲器Z-depth时,返回true。
		[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。
		[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。 
		[page:Materials GreaterDepth] 当输入像素Z-depth大于当前缓冲器Z-depth时,返回true。
		[page:Materials NotEqualDepth] 当输入像素Z-depth不等于当前缓冲器Z-depth时,返回true。
		
		THREE.MultiplyOperation
		THREE.MixOperation
		THREE.AddOperation
		
		
			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。
		[page:Constant MultiplyOperation] 是默认值,它将环境贴图和物体表面颜色进行相乘。
		[page:Constant MixOperation] 使用反射率来混和两种颜色。uses reflectivity to blend between the two colors.
		[page:Constant AddOperation] 用于对两种颜色进行相加。
		THREE.NeverStencilFunc
		THREE.LessStencilFunc
		THREE.EqualStencilFunc
		THREE.LessEqualStencilFunc
		THREE.GreaterStencilFunc
		THREE.NotEqualStencilFunc
		THREE.GreaterEqualStencilFunc
		THREE.AlwaysStencilFunc
		
		
		Which stencil function the material uses to determine whether or not to perform a stencil operation.
		[page:Materials NeverStencilFunc] will never return true.
		[page:Materials LessStencilFunc] will return true if the stencil reference value is less than the current stencil value.
		[page:Materials EqualStencilFunc] will return true if the stencil reference value is equal to the current stencil value.
		[page:Materials LessEqualStencilFunc] will return true if the stencil reference value is less than or equal to the current stencil value.
		[page:Materials GreaterStencilFunc] will return true if the stencil reference value is greater than the current stencil value.
		[page:Materials NotEqualStencilFunc] will return true if the stencil reference value is not equal to the current stencil value.
		[page:Materials GreaterEqualStencilFunc] will return true if the stencil reference value is greater than or equal to the current stencil value.
		[page:Materials AlwaysStencilFunc] will always return true.
		
		THREE.ZeroStencilOp
		THREE.KeepStencilOp
		THREE.ReplaceStencilOp
		THREE.IncrementStencilOp
		THREE.DecrementStencilOp
		THREE.IncrementWrapStencilOp
		THREE.DecrementWrapStencilOp
		THREE.InvertStencilOp
		
		
		Which stencil operation the material will perform on the stencil buffer pixel if the provided stencil function passes.
		[page:Materials ZeroStencilOp] will set the stencil value to 0.
		[page:Materials KeepStencilOp] will not change the current stencil value.
		[page:Materials ReplaceStencilOp] will replace the stencil value with the specified stencil reference value.
		[page:Materials IncrementStencilOp] will increment the current stencil value by 1.
		[page:Materials DecrementStencilOp] will decrement the current stencil value by 1.
		[page:Materials IncrementWrapStencilOp] will increment the current stencil value by 1. If the value increments past 255 it will be set to 0.
		[page:Materials DecrementWrapStencilOp] will increment the current stencil value by 1. If the value decrements below 0 it will be set to 255.
		[page:Materials InvertStencilOp] will perform a bitwise iversion of the current stencil value.
		
[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]