Depth Buffer Precision

How near and far planes affet depth percision

• My openGL render depths are nearly the value of 1 why is that?
• depth buffer got by glReadPixels is always 1
• How am I able to perform perspective projection without a near plane?
• Why is my depth buffer precision so poor?

Reversed-Z Depth Buffer

D3DXMatrixPerspectiveFovRH D3DXMatrixPerspectiveFovRH

参考

• Reversed-Z in OpenGL
• glClipControl
• Depth Precision
• Visualizing Depth Precision
• Reverse Depth Buffer in OpenGL
• OpenGL Projection Matrix
• Attack of the depth buffer
• glm perspectiveRH_ZO
• Reverse Z Cheatsheet