javascript
/
three.js
oglindă de https://github.com/tazdij/three.js.git


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161
							<!DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="utf-8" />
		<base href="../../../../" />
		<script src="page.js"></script>
		<link type="text/css" rel="stylesheet" href="page.css" />
	</head>
	<body>
		<h1>[name]</h1>

		<p class="desc">发送到顶点着色器和片元着色器的GLSL程序的构造函数， 包含默认的变量(uniforms)和属性</p>

		<h2>内置的变量(uniforms)和属性</h2>

		<h3>顶点着色器(无条件的):</h3>
		<div>
		<code>
		// = object.matrixWorld
		uniform mat4 modelMatrix;

		// = camera.matrixWorldInverse * object.matrixWorld
		uniform mat4 modelViewMatrix;

		// = camera.projectionMatrix
		uniform mat4 projectionMatrix;

		// = camera.matrixWorldInverse
		uniform mat4 viewMatrix;

		// = inverse transpose of modelViewMatrix
		uniform mat3 normalMatrix;

		// = camera position in world space
		uniform vec3 cameraPosition;
		</code>
		<code>
		// default vertex attributes provided by Geometry and BufferGeometry
		attribute vec3 position;
		attribute vec3 normal;
		attribute vec2 uv;
		</code>
		<p>
		注意，可以通过以下方式计算顶点着色器中顶点的位置：
		<code>
		gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
		</code>
		或者也可以这样：
		<code>
		gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4( position, 1.0 );
		</code>
		</p>
		</div>

		<h3>顶点着色器(有条件的):</h3>
		<div>
		<code>
		#ifdef USE_COLOR
			#ifdef USE_VERTEX_ALPHA
				// vertex color attribute with alpha channel
				attribute vec4 color;
			#else
				// vertex color attribute without alpha channel
				attribute vec3 color;
			#endif
		#endif
		</code>
		<code>
		#ifdef USE_MORPHTARGETS

			attribute vec3 morphTarget0;
			attribute vec3 morphTarget1;
			attribute vec3 morphTarget2;
			attribute vec3 morphTarget3;

			#ifdef USE_MORPHNORMALS

				attribute vec3 morphNormal0;
				attribute vec3 morphNormal1;
				attribute vec3 morphNormal2;
				attribute vec3 morphNormal3;

			#else

				attribute vec3 morphTarget4;
				attribute vec3 morphTarget5;
				attribute vec3 morphTarget6;
				attribute vec3 morphTarget7;

			#endif
		#endif
		</code>
		<code>
		#ifdef USE_SKINNING
			attribute vec4 skinIndex;
			attribute vec4 skinWeight;
		#endif
		</code>
		</div>

		<h3>片元着色器:</h3>
		<div>
		<code>
		uniform mat4 viewMatrix;
		uniform vec3 cameraPosition;
		</code>
		</div>


		<h2>构造器</h2>

		<h3>[name]( [param:WebGLRenderer renderer], [param:String cacheKey], [param:Object parameters] )</h3>
		<p>参数详见[page:WebGLRenderer WebGLRenderer].</p>

		<h2>属性</h2>

		<h3>[property:String name]</h3>
		<p>The name of the respective shader program.</p>

		<h3>[property:String id]</h3>
		<p>The identifier of this instance.</p>

		<h3>[property:String cacheKey]</h3>
		<p>This key enables the reusability of a single [name] for different materials.</p>

		<h3>[property:Integer usedTimes]</h3>
		<p>How many times this instance is used for rendering render items.</p>

		<h3>[property:Object program]</h3>
		<p>The actual shader program.</p>

		<h3>[property:WebGLShader vertexShader]</h3>
		<p>An instance of [page:WebGLShader] representing the vertex shader.</p>

		<h3>[property:WebGLShader fragmentShader]</h3>
		<p>An instance of [page:WebGLShader] representing the frament shader.</p>

		<h2>方法</h2>

		<h3>[method:Object getUniforms]()</h3>
		<p>
		返回所有活动态的变量(uniform)位置的name-value映射
		</p>

		<h3>[method:Object getAttributes]()</h3>
		<p>
		返回所有活动态的顶点属性位置的name-value映射
		</p>

		<h3>[method:null destroy]()</h3>
		<p>
		Destroys an instance of [name].
		</p>

		<h2>源码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
	</body>
</html>