Questions RE> Performer

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knut (giraffe.asd.sgi.com!sgi.sgi.com!relay.sgi.com!eurohub.neu.sgi.com!oslo.sgi.com!kknut)
Fri, 7 Jan 1994 09:05:58 +0100

I have a number of short questions. I'd be happy if someone could point me
in the right directions on these matters.:

HW : Onyx RE^2
SW : Performer 1.2a55, IRIX 5.1.1.2

1. Textures on polygon on another polygon ...
=============================================
 The scene is created using MultiGen. It seems like performer has some
problems regarding rendring of "double polygons". As when you have a house
wall with window on. These windows are texture mapped.

If you move perpendicular with regards to the window performer tart
flickering between draing the window and drawing the plain wall.

If you have an angle it's ok.

For me as an old gl programmer. It seems like performer has problems
giving the window a correct z-buffer value. ( since it changes when you
move your eye posision away from the polygons normal line)

2. Yello road line gets blurred
==================================
We are using road textures to produce a good looking road with a yellow
middle line.

the problem is that these textures gets blurred in perfromer. They look ok
in Multigen but not in Preformer.

It seems like some information regarding how the texture is supposed to be
mapped onto the polygon is lost when moving from multigen to Performer.

3. Intesity Alpha textures
==============================
In multigen -- works ok (i.e. using the whole intensity range)

In perfromer -- does not work correctly ( look ditherd )

4. Textures sometimes vanishes for short while:
================================================
This is probably the strangest problem. If you drive a long a textured
road. On certain spotsparts of the road dissappears.

My customer has installed a MCO option aswell as a normal screen. If we
run the application using MCO and three channels, the texure can
dissappear in one of the cannels but not in the others.

5. Releases
===========

Maybe problems 1-4 are bugs in Performer ....

What is the current release of Performer ?

When is a MR version of perforemer 1.2 ready ?

If someone can take the time to read this an d help me I'd be
"over-happy"!!

Thanks and best regards

Knut Ivar Foshaug

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