// Right handed
public static bool LookRotationToMatrix(Vector3 viewVec, Vector3 upVec, out Matrix3x3 m)
{
m = Matrix3x3.identity;
Vector3 z = viewVec;
// compute u0
float mag = z.Length();
if (mag < Mathf.Epsilon)
{
return(false);
}
z /= mag;
Vector3 x = Vector3.Cross(upVec, z);
mag = x.Length();
if (mag < Mathf.Epsilon)
{
return(false);
}
x /= mag;
Vector3 y = Vector3.Cross(z, x);
if (!Mathf.CompareApproximate(y.Length(), 1.0F))
{
return(false);
}
m.SetOrthoNormalBasis(x, y, z);
return(true);
}
