==Mat4ToEul==

a utility function to convert 4x4 matrices to a euler rotation, contributed by Joshua Lueng (aligorith)

source/blender/blenlib/BLI_arithb.h

@@ -155,6 +155,12 @@ Mat3ToEul(
 	float *eul
 );
 
+	void 
+Mat4ToEul(
+	float tmat[][4],
+	float *eul
+);
+
 void compatible_eul(float *eul, float *oldrot);
 
 void Mat3ToCompatibleEul(float mat[][3], float *eul, float *oldrot);

source/blender/blenlib/intern/arithb.c

@@ -2215,6 +2215,15 @@ void Mat3ToEul(float tmat[][3], float *eul)
 	}
 }
 
+void Mat4ToEul(float tmat[][4], float *eul)
+{
+	float tempMat[3][3];
+
+	Mat3CpyMat4 (tempMat, tmat);
+	Mat3Ortho(tempMat);
+	Mat3ToEul(tempMat, eul);
+}
+
 void QuatToEul( float *quat, float *eul)
 {
 	float mat[3][3];