static Matrix4x4 LookAtMatrix(Vector3 up_vector, Vector3 localPosition)
{
var z_axis = localPosition.normalized;
var x_axis = Vector3.Cross(up_vector, z_axis).normalized;
var y_axis = Vector3.Cross(z_axis, x_axis).normalized;
return(UnityExtensions.Matrix4x4FromColumns(x_axis, y_axis, z_axis, new Vector4(0, 0, 0, 1)));
}
public static Matrix4x4 RotationToWorldAxis(this Matrix4x4 m)
{
return(UnityExtensions.Matrix4x4FromColumns(
m.MultiplyVector(Vector3.right),
m.MultiplyVector(Vector3.up),
m.MultiplyVector(Vector3.forward),
new Vector4(0, 0, 0, 1)
));
}
static Matrix4x4 LookAtMatrixFromWorld(Vector3 from, Vector3 target)
{
var pos = new Vector4(from.x, from.y, from.z, 1);
return(LookAtMatrix(UnityExtensions.Matrix4x4FromColumns(Vector3.right, Vector3.up, Vector3.forward, pos), target));
}
