这个程序demo了怎样使用glCopyToTexture函数绘制。这个纹理是应用在一个立方体上的。-This app demonstrates how to render to a texture using the glCopyToTexture function. I have used one of my old projects to create a interesting effect (Blending colors). This is rendered to a viewport

延时渲染，首先准备N个与屏幕同大小的纹理作为渲染缓冲区，接下来向这个纹理渲染东西，一般用FBO，渲染的时候，把每个象素最终的法线值、位置、纹理信息分别渲染到这N个纹理中。这是第一次渲染。然后第二次渲染的时候，把之前得到的纹理中的值作为光照计算的输入值来计算光照。-Delay rendering, the first screen for N-and render the same size as a buffer texture, the next thing to render the tex

Conventional approaches to render a scene require geometric descr iption such as polygonal meshes, etc and appearance descr iptions such as lights and material properties. To render high quality images such descr iptions, we require very accurat