Billboard/Sprite and animated geometry

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Mario Veraart (rioj7++at++fel.tno.nl)
Fri, 11 Apr 1997 22:19:27 +0200 (MET DST)

Hello,

I'm making a special effect with performer primitives.
I began using the pfBillboard, but after carefull reading
I noticed that the planerity of the geometry is not allowed to
change. Then I used a pfSprite in a node Draw callback.
Still no animation. The animation works because if I disable
the pfSprite I can see the animation.
After disabling the animation in the Y direction, to get
the wanted planerity, still no animation visible with the
pfSprite enabled. The effects contains two pfGeoSets. One contains
one square that is animated and was always visible. The other contained
a lot of polygons. After playing with the number of primitives in the
second pfGeoSet I found that more than 2 primitives results in
not showing the geoset the right way. What I see are some thin textured lines
that gome and go, not every frame though.

I run on a Maximum Impact with
Irix5.3 Performer 2.0
patches installed: 1332 Impact Graphics bug fixes for 5.3
                    1543 X server fixes for Impact graphics

Does anybody know what could be the cause of this behaviour?

Manual error:
  You are not allowed to call pfSprite::setPosition outside
  the pfSprite::begin and pfSprite::end pair.
  If gives a Segmentation fault.

Mario Veraart

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