High Impact Texturing

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Andrew Ng (nga++at++division.co.uk)
Wed, 6 Mar 1996 15:38:21 -0000


I've been experiencing some texturing problems on an Indigo 2 High Impact
system.

Basically I have this room which has a textured ceiling and floor which are
both constructed of two triangles to form a quad. When the view direction is
horizontal in a parallel plane to the ceiling and the floor, I randomly get an
untextured horizontal (relative to the graphics window) line segment over the
textured ceiling/floor as I move the view position. These line segments vary
from being a complete scan line to a small section of a scan line.

As soon as the view direction is nolonger horizontal or in a parallel plane to
the ceiling/floor then the problem disappears. I've tried changing the minify
and magnify filters but they appear to make no difference. I've also not
noticed any such problems on RE2 systems.

I'm using Performer 2.0 and I've tried both OpenGL and IrisGL versions. The
system itself is running IRIX 5.3 All Indigo 2 Impact. This is the output
from gfxinfo :-

Graphics board 0 is "IMPACT" graphics.
Any help or suggestions would be appreciated.

Thanks.
------------------------------------------------------------------------------
  Andrew Ng (Software Engineer)
  Division Limited, 19 Apex Court, Email: nga++at++division.co.uk
  Woodlands, Almondsbury. Tel: +44 (0)1454 615554
  Bristol BS12 4JT. Fax: +44 (0)1454 615532


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