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<h1>自定义混合方程常量（Custom Blending Equation Constants）</h1>
<h2>示例</h2>
<p>[example:webgl_materials_blending_custom materials / blending / custom ]</p>
<h2>用法</h2>
<p>
这个常量可以用于所有的材质类型。首先将材质的混合模式设置为THREE.CustomBlending，然后设置所需要的混合方程、源因子和目标因子。
</p>
<code>
var material = new THREE.MeshBasicMaterial( {color: 0x00ff00} );
material.blending = THREE.CustomBlending;
material.blendEquation = THREE.AddEquation; //default
material.blendSrc = THREE.SrcAlphaFactor; //default
material.blendDst = THREE.OneMinusSrcAlphaFactor; //default
</code>
<h2>混合方程</h2>
<code>
THREE.AddEquation
THREE.SubtractEquation
THREE.ReverseSubtractEquation
THREE.MinEquation
THREE.MaxEquation
</code>
<h2>源因子</h2>
<code>
THREE.ZeroFactor
THREE.OneFactor
THREE.SrcColorFactor
THREE.OneMinusSrcColorFactor
THREE.SrcAlphaFactor
THREE.OneMinusSrcAlphaFactor
THREE.DstAlphaFactor
THREE.OneMinusDstAlphaFactor
THREE.DstColorFactor
THREE.OneMinusDstColorFactor
THREE.SrcAlphaSaturateFactor
</code>
<h2>目标因子</h2>
<p>
所有的源因子的值，在目标因子中都是有效的。除了：<code>THREE.SrcAlphaSaturateFactor</code>
</p>
<h2>源代码</h2>
<p>
[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]
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