gl_ModelViewProjectionMatrix与gl_ModelViewMatrix [英] gl_ModelViewProjectionMatrix vs gl_ModelViewMatrix

问题描述

我是GLSL的初学者.我正在阅读顶点着色器代码，但我不理解这部分代码:

I am beginner at GLSL. I was reading a vertex shader code and I don't understande this part of code:

out vec3 position;
...
gl_Position=gl_ModelViewProjectionMatrix*gl_Vertex; 
position=vec3(gl_ModelViewMatrix*gl_Vertex); 

gl_ModelViewProjectionMatrix和gl_ModelViewMatrix有什么区别?

What are the differences between gl_ModelViewProjectionMatrix and gl_ModelViewMatrix?

gl_Position和位置之间有什么区别?

What are the differences between gl_Position and position?

推荐答案

您可能会怀疑，gl_ModelViewProjectionMatrix是gl_ModelViewMatrix，其中添加了投影-即透视相机的扭曲.

As you might suspect, gl_ModelViewProjectionMatrix is gl_ModelViewMatrix with the addition of the projection -- that is, the perspective camera distortion.

gl_Position是预定义的变量，表示此顶点着色器的投影结果"(需要所有顶点着色器为gl_Position分配一个值)，而值"position"是附加的程序员定义的值，骑(为什么不能说，取决于整个着色器)

gl_Position is a predefined variable meaning "the projected result of this vertex shader" (all vertex shaders are required to assign a value to gl_Position), while the value "position" is an extra programmer-defined value that comes along for the ride (why is impossible to say, depends on the entire shader)

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