public static Matrix4x4 InverseSubMatrix(this Matrix4x4 m)
{
float det = m.DeterminantSubMatrix();
if (det == 0)
{
throw new System.ArgumentException("Cannot calculate inverse of the matrix since it is singular.");
}
float detInv = 1 / det;
Matrix4x4 output = m.AdjugateSubMatrix();
output.m00 *= detInv;
output.m01 *= detInv;
output.m02 *= detInv;
output.m10 *= detInv;
output.m11 *= detInv;
output.m12 *= detInv;
output.m20 *= detInv;
output.m21 *= detInv;
output.m22 *= detInv;
output.m30 = m.m30;
output.m31 = m.m31;
output.m32 = m.m32;
output.m33 = m.m33;
return(output);
}