Fog on RE

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Marc SIMON Presales support (smarc++at++girl.paris.sgi.com)
Fri, 17 Jun 1994 15:14:06 -0600

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Testing some customers codes using fog with perforemr 1.2 seems to show a
problem with the resolution of the fog table on the RE2.

When using FG_PIX_LIN or FG_PIX_EXP or FG_PIX_EXP2 with a far fog of 1000
m for instance and when drawing an object at 1100 m it is still visible.
I known that it is of course related to the range of Z value defining by
the near and far clipping plane and the lsetdepth value.But it works fine
on a Indigo2 Extreme...

You can try :

        - perfly enterprise.flt
                The model appear at ~ 2600 m from the viewer
        - fog on (Exponential or linear)
        - move the far fog to 2500 m .

- You could see that the Mister Spoke ears are always visible...

Try to do the same on Extreme GFX ... It works fine.

Thanks to explain to me what's happend . Is it a bug ?? Is there a way to
avoid this ??

My customer is today waiting for an answer to decide to continue or to
stop with Performer .

Thanks to help me quickly.

-- 
-- Marc --		   Marc SIMON Presales support
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	Silicon Graphics France
	21 Rue Albert Calmette
	Jouy-en-Josas 78350 FRANCE
	Tel (33) 1 34-88-80-00
	email : smarc++at++paris.sgi.com

++++++++++++++++++++++++++++  smarc++at++paris.sgi.com  ****************************

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