I think it should be fairly simple to implement and should work this way:
it would control the trace level at which the object becomes visible.
Eg: visibility_level 0: this should do nothing.
visibility_level 1: the object wouldn't be directly visible but it would be
reflected and refracted and it would be taken into account for radiosity
calculations.
visibility_level n: the object wouldn't be directly visible but it would
become visible starting from the n_th level of recursion.
Of course if n> max_trace_level-1 the object wouldn't be visible at all.
I think this would be a much more powerful flag than no_image.
Any takers?
I saw this somewhere, but can't remember where.
--
Jonathan.
Home: http://digilander.iol.it/jrgpov
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