Hi I use a vertex array to render a heightmap (triangle strips). Each vertex needs a normal to have my landscape be smooth shaded, right? Can I just take the average of all the normals of al the triangles that are around the vertex? Or should I just take the normal of the last triangle in the strip? Thanx, Marty

Yes, you would take the average of the normals of the surfaces next to the vertex, (phew...). This would give you nice, smooth lighting. But what I did was to calculate all the normals first and put them into an array.