着色器的使用请参考《WebGL编程指南》第二章入门的“着色器是什么”以及第六章“OpenGL ES 着色器语言(GLSL ES)”
知识点
着色器传值
//color = osg.Uniform.createVec4(vec4(1,1,0,0),'color');
var lightPos = osg.Uniform.createFloat3( [ 0, 0, -10 ], 'lightPos' );
target.getOrCreateStateSet().addUniform( lightPos );
target2.getOrCreateStateSet().addUniform( lightPos );
'uniform vec4 lightPos;',
形状变化
形状改变是在顶点着色器vertexshader里面用代码控制的
' if(Vertex.x == 1.0 && Vertex.y == 1.0 && Vertex.z == 1.0){ gl_Position = ProjectionMatrix * ModelViewMatrix * vec4(Vertex.x + 1.0, Vertex.y + 1.0, Vertex.z + 1.0,1.0); alpha = 0.0;}',
'else {gl_Position = ProjectionMatrix * ModelViewMatrix * vec4(Vertex,1.0); alpha = 1.0;}',
' position = ModelViewMatrix * vec4(Vertex.x ,Vertex.y ,Vertex.z,1.0); ',
颜色的变化是在片元着色器fragmentshader里面控制的
' const vec4 diffColor = vec4(0.5, 0.0, 0.0, 1.0);',
' const vec4 specColor = vec4(0.7, 0.7, 0.0, 1.0);',