In article <3d3ed0da@news.povray.org>, Micha Riser <mri### [at] gmxnet> 
wrote:

> I called it a bug because ior has been moved from finish to interior 
> because ior has to be constant in the whole object to prevent that a ray 
> enters at one ior and leaves at a different one. But when two object of 
> different ior are merged / intersected exactly the same thing happens. 

There isn't really any way around that. At least it is an improvement.
One thing that has been bothering me is the "glass of water" type 
situation...I'm not sure POV handles it correctly or how to model it 
correctly.


> I see now that overlaping of transparent object in union cannot be checked 
> at parsing time and checking it during rendering would things slow down. 
> But in the case of merge/intersection a warning at parsing time could be 
> issued.

It is no more possible in those cases than it is in a union. They would 
have to be checked at render time just like unions.
The best you could do is check if the bounding boxes overlap and give a 
"possible overlap" warning if more than one object is transparent, but 
that would happen so often it would be completely useless.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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