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OpenGL z matrix value opengl

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Can you ask your question in another way? Is your question about the z-buffer, or the z coordinate of an object, or.. ?

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Maybe like this:

Mat4 glGetMatrixMVP(){
Mat4 mv,p;

Mat4 mvp = p*mv;
return mvp;
Mat4 mvp = glGetMatrixMVP();
vec4 origin=vec3(0,0,0,1);
vec4 transformed = mvp * origin;

now you have the transformed.z value

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