c++ - OpenGL: Problem With Phong Model Specular Lighting

Question

I know that specular lighting is also based on the view direction. But I can't find what the default view direction is in old OpenGL function glLight(.. GL_SPECULAR..). How does it determine the direction of the view?

Answer 1

在旧的 OpenGL 中，光照是在视图空间中完成的，其中相机坐标为 (0, 0, 0)，因此视图方向向量等于片段的位置。