Hi! I m on the case of per pixel lighting! well everything goes fine until I want a move my light position... based on: http://www.ronfrazier.net/apparition/index.asp?appmain=research/per_pixel_lighting.html: here s my code: SNIP... Int i; Int l_vertexCount = in_primitive->GetVertexCount(); Float l_radius = 1.0f; Vector3 l_coords; Vector3 l_vertex; Vector3 l_origin = Vector3(0.0f, 1.0f, 3.0f); for (i = 0; i < l_vertexCount; ++i) { l_vertex = in_primitive->GetVertex(i); l_coords = (l_vertex - l_origin) / (l_radius * 2.0f); glMultiTexCoord2fvARB(GL_TEXTURE0_ARB, (Float*) &l_coords); glMultiTexCoord1fARB(GL_TEXTURE1_ARB, l_coords.z); } SNIP... the thing is, when playing with the l_radius the intesity of the light changes no problems... but... the l_origin should move the light but it doesn't... it always stick in the middle of what ever i m lighting... if rotating a mesh... the light rotate with it... and there s no way to change the light position... any ideas? THX