From: Mark Aubin (aubin++at++mustang.engr.sgi.com)
Date: 01/04/2000 17:17:08
Hi Dave,
Thanks for reporting this. This is a bug, and we have been working
on a fix for it. We will post a message when a new version of
ClipGen is available with the fix.
For more information on the specifics of feather edges and mask
files, please see the clipgen man page.
--Mark Aubin
On Jan 4, 3:56pm, Findley, David A wrote:
> Subject: Gray lines in clip texture
>
> Greetings,
>
> I used ClipGen to create a clip texture for display on an Onyx 2 Infinite
> Reality. The clip
>
>
> texture is made up of four .rgb images in Lambert Conformal Conic
> projection, each of which
>
>
> covers a little over a one-degree area. My problem is that there is a gray
> edge along the
>
>
> boundary between input images in the lower LOD mipmaps. The highest
> (closest to viewpoint)
>
>
> LOD has no boundary line. ClipGen appears to be averaging in pixels just
> off the image to create
>
>
> the mipmaps. I have tried moving the boundaries defined for the image in
> the input .geo file
>
>
> inside the image, I have tried a range of invalid border values from 0 up, I
> have tried a
>
>
> range of feather edges values from 0 up, all to no avail. I have run out of
> ideas, and hope
>
>
> someone can give me a lead on what to try next. Can anyone describe how the
> invalid border, feather edges, and mask file work? There is no help file.
>
> Other pertinent parameters in my ClipGen setup are:
> clip texture size: 8192 x 8192
> tile size: 512
> clip size: 1024
> headroom: 1
> ext and int formats: 888
> start and end levels: 0 and 13
>
> All boundaries are defined in meters from the Lambert Conformal
> conic reference center.
>
> I use homebrewed software to map the database vertex u,v's to Lambert
> Conformal conic
>
> Thanks
>
>
> Dave Findley
> Boeing Flight Simulation - St. Louis
> (314) 232-7846
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>-- End of excerpt from Findley, David A
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