| Re: Polygons and polylines [message #19792] |
Wed, 26 April 2000 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
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Senior Member |
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Steven Chetelat, chetelat@csee.usf.edu writes:
> Does the polygon object allow
> for transparency?
Investigate the use of a 'texture map': an image object which
gives colour to the polygon faces and overrides (well, interacts with)
the colours given to the polygon vertices. If the image has a fourth,
'alpha', channel the values in that channel determine the degree of
transparency. I think David F. has an example of how to do this on
his website (www.dfanning.com).
You also need to pay attention to the order in which objects are
drawn, with the frontmost, transparent object drawn last. You control
the drawing order by changing the ordering of the objects in their
enclosing model or view. I don't know if this works with two
intersecting transparent surfaces, but I suspect that only one will be
drawn properly.
Struan
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