private void Refresh()
{
if (!isdrity)
{
return;
}
isdrity = false;
_matrix = UMatrix4x4.TRS(_localPos, _localRot, _localScale);
_invmatrix = _matrix.Inverted();
}
/// <summary>
/// Looks at position, target and up.
/// </summary>
/// <returns>The <see cref="UMath.UMatrix4x4"/>.</returns>
/// <param name="eye">Position.</param>
/// <param name="target">Target.</param>
/// <param name="up">Up.</param>
public static UMatrix4x4 LookAt(UVector3 eye, UVector3 target, UVector3 up)
{
var w = (target - eye);
w.Normalized();
var u = UVector3.Cross(up, w);
u.Normalized();
var v = UVector3.Cross(w, u);
v.Normalized();
var trans = CreateTranslate(-eye);
var m = new UMatrix4x4(
u.x, v.x, w.x, 0,
u.y, v.y, w.y, 0,
u.z, v.z, w.z, 0,
0, 0, 0, 1);
return(trans * m);
}
/// <summary>
/// Looks the rotation.
/// </summary>
/// <returns>The rotation.</returns>
/// <param name="forward">Forward.</param>
/// <param name="up">Up.</param>
public static UQuaternion LookRotation(UVector3 forward, UVector3 up)
{
return(UMatrix4x4.LookAt(UVector3.zero, forward, up).Rotation);
}
/// <summary>
/// Decompose the specified m, trans, rotation and scale.
/// </summary>
/// <param name="m">M.</param>
/// <param name="trans">Trans.</param>
/// <param name="rotation">Rotation.</param>
/// <param name="scale">Scale.</param>
public static void Decompose(UMatrix4x4 m, out UVector3 trans, out UQuaternion rotation, out UVector3 scale)
{
trans = m.Translate;
rotation = m.Rotation;
scale = m.Scale;
}