In article <39DF469B.BA9559C2@usb.ve>, jac### [at] usbve wrote:

>   The left image is the normal render you get with one light source.  
>   In my opinion, the dark shadows cast by the glass are to dark.  I 
>   have observed this kind of refractive caustics in some experiments 
>   I have done with real glasses and lights, so they are right from 
>   the physical point of view as remarked by N. Kopp elsewhere in this 
>   newsgroups.  In the other hand, the reflective caustics are to 
>   bright.

Refraction affects *all* the light that passes through...there isn't any 
light that passes straight through a lens without being bent. The areas 
that have light refracted away will be completely dark, this is 
physically correct.
However, in the real world, you usually don't have all the light coming 
from a single source, but have light bouncing off of the surrounding 
objects, walls, and coming from other light sources. Also, complex 
shapes can refract light into areas that are mostly dark. Try putting 
white walls around, and turning radiosity on. A dim light source at the 
camera's position would help too, and you might try adding small 
irregularities in the glass normal.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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