Thanks to all for viewing, making comments and suggestions ! >Rivers, yes you perfectly understood what I tried to explain, I think I will try very soon your very interesting suggestion ! Probably better than the idea I had to improve the above pic. >Nightvoice, I always use soft shadows greater than 5 : in that scene I choosed 10 for the two lights inside the "box", and 20 for the spotlight outside the box. Also I often use fallof greater or equal to 50% for the spotlight cause that is softening the shadow/light transition, but I don't know it it increases the rendering time > Kurka , Maybe I could impose more darkness in the room (reduce the cone angle of the spotlight), but I suppose it's a question of feeling. There are shadows under the box, the spotlight comes frome above. But I always prefer soft shadows, even when they are not real, cause they look more real to the viewer. I also often have lot of "ambiant light" in my settings to have something like global illumination in my interior scenes >hein, the menu is exactly the same that for Vue2.1 Your settings show 1.72 for refraction index which is more accurate for a crystal, but it's absolutely true that it will produce more reflections (so I should try your suggestion). Concerning reflection, I never use it since it is said that with a refraction index greater than 1, you will have natural reflection. But it's a very hard problem, since reflection is also affected by "Turn reflective with angle" setting. Cause refraction index is theoritically the parameter governing the limit angle for reflection. Does it mean that "Turn reflective with angle" account for some surface finish effects (bumps) which could modify the theoritical limit angle ? Interesting, but aniway your recommended setting 48 is greater than default from Vue I'm so happy to have this discussion and suggestion, Yves