Hi,
i have some trouble with transformation coord
it's in shadow volume case, i have an objet in my world with position and rotation
i have a light point to générate the shadow volume (it work good)
i can modify the position of my objet, it's ok for shadow, i can too made Y rotation, it's ok again but i can't make X and Z rotation
i do this to have light position with my object
vecLight = lightpos;
vecLight -= lo.Position;
vecLight.TransformCoordinate(Matrix.RotationX(Geometry.DegreeToRadian(-lo.Rotation.X)) * Matrix.RotationY(Geometry.DegreeToRadian(-lo.Rotation.Y)) * Matrix.RotationZ(Geometry.DegreeToRadian(-lo.Rotation.Z)));
lo.MakeShadowVolume(vecLight);
i annulate the deplacement and the rotation (like the object is the center of the world to have light position) it's work good but X and Z not work :s
other think to know, the light vector will be modified after like this :
public void MakeShadowVolume(Vector3 lightpos)
{
if (!ombreRefaire) return;
//Matrix mat = Matrix.RotationAxis(new Vector3(1,0,0),Geometry.DegreeToRadian(Rotation.X)) * Matrix.RotationAxis(new Vector3(0,1,0),Geometry.DegreeToRadian(Rotation.Y)) * Matrix.RotationAxis(new Vector3(0,0,1),Geometry.DegreeToRadian(Rotation.Z)) * Matrix.Translation(Position);
Vector3 lightVector = Vector3.Normalize( -lightpos );
ombre.BuildFromMesh(ox.OXMesh, lightVector, Matrix.Identity);
ombreRefaire = false;
}
and at the end, the vector is modified like :
public void BuildFromMesh(Mesh mesh, Vector3 lightVector, Matrix rotationTransform)
{
// transform light vertor by inverse rotation transform used for the shadow volume & the shading mesh
Vector4 tlv = Vector3.Transform( lightVector, Matrix.Invert(rotationTransform) );
lightVector = new Vector3( tlv.X, tlv.Y, tlv.Z );
...
pictures to see the problem with comments :
http://tech.daaboo.net/images/060615-p-0.jpg
http://tech.daaboo.net/images/060615-p-1.jpg
http://tech.daaboo.net/images/060615-p-2.jpg
http://tech.daaboo.net/images/060615-b-0.jpg
http://tech.daaboo.net/images/060615-b-1.jpg
http://tech.daaboo.net/images/060615-b-2.jpg
can you help me please ?
i have make some analyse and test
if only one axis of rotation is defined : it's ok for the shadow
but if more than one are defined : shadow move anormally
maybe it's my formula that's not correcte ? (see previous post)
thanks a lot
Killan
