Hi,

I 'm trying to create a view of earth from space, where natural changes between night and day can be seen. I have two spheres, which textures are night view(city lights) and day view (map). The problem is how to blend them together so that the transition edge between the day and night isn't sharp but smooth. One approach is to translate other sphere a bit off center and move it, but the quality ot the effect is poor.

The ideal case would be that there is a light(sun) that shines the GEM sphere object(earth) and the light side is seen textured as day and other side as night. I have not seen that alphablend could be used only on some part of a GEM object such as sphere.

Any ideas how to create this?