Re: Strange effect with alpha texture

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Angus Dorbie (dorbie++at++multipass.engr.sgi.com)
Sat, 14 Feb 1998 10:04:07 -0800


Yep this is a transparency zbuffer problem, specifically a sorting issue. when
you turn transparency off on the driver he doesn't get sorted and therefore
gets drawn first.

You should try using pfAlphaFunc state info on the driver but keep transparency
off.

Cheers,Angus.

On Feb 13, 4:13pm, princess support wrote:
> Subject: Strange effect with alpha texture
> Hi there!
>
> I experienced a very strange effect with alpha textures within perfly.
>
> Having a model of a car in as well .dwb as .flt file format with alpha
textures
> for the windows of the car as well as for a driver inside the car depending
on
> the angle I look at the car in perfly the driver is visible or not.
> It seems to be a problem with having a poly with alpha texture drawing
against
> another poly with alpha texture because if I switch the texture of the driver
to
> a non-alpha texture the driver is visible all the time.
>
> Has anybody out there already experienced something similar.
>
> This effect appears on an HighImpact with 4MB TRAM, Performer 2.0, OS 6.2 as
> well as on an O2 (Performer 2.0).
>
> Any help is very much appreciated.
>
> Christoph Tillack.
>
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