vtk texture problem

[Bill Hoffman]

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This is a hardware issue.   You would have to have LOTS of video memory
for a texture map that large.   You have to break up the textures yourself.

You should be able to break up the texture map yourself and set the texture
coordinates for each sub-map to the parts of the terrain it covers.


I found this with deja.com:

Subject:Re: Texture Maps Larger Than 256x256
Date:1998/04/03
Author:Brian Hammond <bhammond at vh.net>
Posting History

Goto www.opengl.org, bottom right of the page is "featured code" which is 
the Siggraph '97 OpenGL Code Examples ... You'd want to check out 
texpage.c. It shows how you can display "very large" textures by breaking 
the large texture into smaller textures that can be placed to fit together.

Good luck,
Brian Hammond




At 04:16 PM 11/2/99 +0100, you wrote:
>Dear vtk-ers,
>
>  We are using vtk for developing an interactive GIS application,
>  unfortunately we experienced strange behavior when trying to apply a
>  large texture over a digital elevation model (basically a triangular
>mesh).
>
>  The texture simply does not appear when applying images larger than
>  1024x1024. We feel that this is another OpenGL limitation similar
>  to the 'power of  two' one. The same problem arises on an SGI Indigo2
>  and a PC PIII  (with `OpenGL32`)
>
>   - Did anyone experience the same or, as novices,
>     are we doing something wrong?
>
>  Are there any tricks to overcome this?
>
>  Any hint would be appreciated.
>
>  Thanks a lot,
>
>  Manfred
>___________________________________
>  Dr. M. Thüring - Istituto di Scienze della Terra
>  C.P. 250 - CH-6593 Cadenazzo (Ticino, Switzerland)
>  Tel +41 91 / 858 34 72 - Fax +41 91 / 858 34 05
>  eMail: thuering at ist.supsi.ch
>
>
>
>
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William A. Hoffman
Kitware Visualization Solutions / vtk Commercial Support
469 Clifton Corporate Parkway
Clifton Park, NY 12065
bill.hoffman at kitware.com
1-518-371-3971 (Phone & Fax)



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