Fernando Gonzalez del Cueto wrote:
> 
> I made this scene some months ago, and decided to re-render it with higher
> settings and different textures and tweakings.
> 
> It has some focal blur, I might retry it with a higher focal blur.
> 
> Time to render 29 hours.
> 
> I hope you like it. Comments/suggestions are welcomed.

Good modelling work on the glass but the ground shows all indications for
poor usage of image maps.  Don't take this too seriously, it is very
difficult to make well and i have seen a lot of pictures by professionals
that were much worse, none the less i like to point it out.  

The main problems about image maps for rough surfaces like this are: 

- the inherent lighting of the image maps does not harmonize with the
scene.  Possible solutions are to either use an image map with a lighting
very similar to that in the scene (quite impossible for caustics like
this) or to remove the lighting from the image map.  For very rough
surfaces this is nearly impossible, in any case it usually requires a lot
of handwork and experience (Kari Kivisalo did some quite impressive tests
for that).  
- when the image map is only applied to a flat surface, possibly with a
bump map derived from it, the surface lacks self shadowing effects which
are quite important for realistic appearance.

Christoph

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