在opengl c ++中切换相机的视图

Question

I want to control 2 cameras, each with different modelview matrix.

But I'm not able to save and recover the matrix. Any suggestions?

Answer 1

Why can't you save them? This should let you save and restore a matrix. Or just use push/pop.

float matrix[16];
glGetFloatf(GL_MODELVIEW_MATRIX, &matrix); //save
glLoadMatrixf(&matrix); //restore

Answer 2

each camera class should have its own modelview matrix. You can either get the current model view matrix from OpenGL (as it was explained by Tim), or you can use some custom library for math.

Custom math library is needed for core OpenGL (3.3 and above) and OpenGL ES 2.0

try not to stick with math library inside "old" OpenGL