Simon.Mills++at++esa.int
Date: 07/26/2004 03:13:11
Hi Performers,
I've encountered an unfortunate feature of the clipgen utility for creating
cliptextures. I wanted to use the alpha component in a cliptexture as a
"gloss map" to create a shiny sea effect in my applications. However, it
appears that clipgen "applies" alpha values in source imagery into the RGB
values in the produced cliptexture tiles. I can see this using for example
the viewtile utility provided with Performer. Where alpha=0, RGB values are
set to black. The intermediate pyramid files seem to be OK, only the raw
tiles show this.
Is this the desired behaviour? Anyway to stop it doing this? Any workaround
(I guess I could bypass clipgen and do it manually but I would like to
avoid that).
Oh, yes, it's clipgen 1.2a8 (well, I think so, the help menu says 1.2a7).
BTW, clipgen crashes on me without warning sometimes unless I restrict the
number of processors it uses (I have a 6-CPU Onyx2). Any help on that one?
Would a 64-bit version of clipgen help? Is there one available?
Regards,
Simon Mills
Simulation & Modelling Section
European Space Agency
Noordwijk, The Netherlands
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