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grendizerufo / nvidia-texture-tools

Automatically exported from code.google.com/p/nvidia-texture-tools
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cubemap processing tool #75

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Add tool to compress cubemaps similar to the one described at:

http://ati.amd.com/developer/techreports/2005/SIGGRAPH2005/Isidoro-CubeMapFilter
ing-Sketch-SIG05.pdf

Original issue reported on code.google.com by cast...@gmail.com on 4 Jan 2009 at 10:13

GoogleCodeExporter commented 9 years ago 
That basically has three components: 
- Angular Extent Filtering: To create cubemap mipmaps.
- Edge Seam Fixup: To prevent seams on hardware that does not support cubemap 
border
filtering or explicit texture borders. Explicit texture borders do not make 
efficient
use of video memory. So, even when supported some applications prefer to avoid 
them.
- Constrain DXT color endpoints along seam: To avoid seam artifacts when end 
points
chosen are different and the colors along the seam are approximated differently.

Original comment by cast...@gmail.com on 27 Jan 2009 at 11:32

GoogleCodeExporter commented 9 years ago 
It looks like cubemapgen is now open sourced:
http://download-developer.amd.com/GPU/zip/CubeMapGen-1.4-Source.zip

I've actually got CubeMapGenLib linked into nvtt and it works with the 
CCubeMapProcessor interface.  The only downsides I see is to use the interface, 
I have to convert the floatimage data to a format that the lib likes, and then 
convert it back afterwards. Internally, CubeMapGenLib does it's own data 
conversion step too.

Also, dxt compression part of the edge fixup has been removed.

Original comment by hallchr...@gmail.com on 31 Aug 2011 at 5:41

GoogleCodeExporter commented 9 years ago 
Well, this is great news. It seems the interesting code is at:

http://code.google.com/p/cubemapgen/source/browse/trunk/CCubeMapProcessor.h
http://code.google.com/p/cubemapgen/source/browse/trunk/CCubeMapProcessor.cpp

it would be nice to integrate this into NVTT to facilitate its use and avoid 
explicit format conversions. I cannot commit to it right now, but since it 
doesn't seem to be a lot of work, I'll probably get to it some time in the 
future.

Original comment by cast...@gmail.com on 1 Sep 2011 at 5:05

GoogleCodeExporter commented 9 years ago 
Basic support for cubemaps is already available in trunk. Open new issues for 
additional features.

Original comment by cast...@gmail.com on 31 Jul 2012 at 11:49