Hi Christoph,

Actually the lighting of the bitmap was quite uniform. I manipulated the
imagemap to make it a bumpmap, highlighting only the cracks and fissures of
the stone.

But you're right, it is not flawless. Also, you can see that the tiles are
the same. Fortunately, it is not quite evident until you begin to inspect
the image more carefully.

Thanks for your comments,

Fernando.


news:3EAD5633.FE2C5CAE@gmx.de...
>
>
> 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
>
> --
> POV-Ray tutorials, include files, Sim-POV,
> HCR-Edit and more: http://www.tu-bs.de/~y0013390/
> Last updated 28 Feb. 2003 _____./\/^>_*_<^\/\.______

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