Math/Matrix4: Fix cotangent in projection matrix

Former-commit-id: 57ccfc4fd2a1a8245272328204afa6590a5cb3fb
2015-06-26 14:05:50 +02:00
parent b7b5458c79
commit 7dd4965f9a
2 changed files with 5 additions and 1 deletions
--- a/include/Nazara/Math/Matrix4.inl
+++ b/include/Nazara/Math/Matrix4.inl
@@ -623,7 +623,7 @@ NzMatrix4<T>& NzMatrix4<T>::MakePerspective(T angle, T ratio, T zNear, T zFar)
 	angle = NzDegreeToRadian(angle/F(2.0));
 	#endif

-	T yScale = F(1.0) / std::tan(angle);
+	T yScale = std::tan(M_PI_2 - angle);

 	Set(yScale / ratio, F(0.0), F(0.0), F(0.0),
 	    F(0.0), yScale, F(0.0), F(0.0),