ScriptReference/Matrix4x4.Perspective

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ScriptReference/Matrix4x4.Perspective

https://docs.unity3d.com/ScriptReference/Matrix4x4.Perspective.html

[Henry00IS]

This projection matrix is based on the OpenGL convention where forwards is Z positive. Unity uses the DirectX convention where forwards is Z negative. If you want identical behavior to Unity's coordinate system with simple matrix transforms, then make sure to negate the embedded z-flip operation:

projection.m02 *= -1f;
projection.m12 *= -1f;
projection.m22 *= -1f;
projection.m32 *= -1f;