Comments on: Green tangent space normal maps http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/ Rick Stirling, games artist Thu, 26 Jan 2012 03:07:48 +0000 hourly 1 http://wordpress.org/?v=3.3 By: Computer Game News and Reviews http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/comment-page-1/#comment-12423 Computer Game News and Reviews Mon, 01 Oct 2007 22:24:45 +0000 http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/#comment-12423 <strong>Computer Game News and Reviews...</strong> I couldn't understand some parts of this article, but it sounds interesting... Computer Game News and Reviews…

I couldn’t understand some parts of this article, but it sounds interesting…

]]> By: Eric Chadwick http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/comment-page-1/#comment-5269 Eric Chadwick Thu, 14 Dec 2006 22:31:15 +0000 http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/#comment-5269 Thanks for the cool resources Rick. Nvidia told me when using their compressor I should zero out the red and blue channels, since their algo compresses all three channels together. The less colors it has to accomodate in the compression step, the more accurate the green channel colors will end up. Another option is use white in one of the unused channels, and darken it down in the mips. The shader can use this to shorten the normals with distance to get rid of the specular messiness you get on distant surfaces. http://www.nvidia.com/object/bump_map_compression.html http://ati.amd.com/developer/NormalMapCompression.pdf Thanks for the cool resources Rick.

Nvidia told me when using their compressor I should zero out the red and blue channels, since their algo compresses all three channels together. The less colors it has to accomodate in the compression step, the more accurate the green channel colors will end up.

Another option is use white in one of the unused channels, and darken it down in the mips. The shader can use this to shorten the normals with distance to get rid of the specular messiness you get on distant surfaces.

http://www.nvidia.com/object/bump_map_compression.html
http://ati.amd.com/developer/NormalMapCompression.pdf

]]> By: rsart - home of Rick Stirling, games artist, designer, egotist and raconteur » Blog Archive » I’ve moved the header images, and fixed the normal map post http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/comment-page-1/#comment-396 rsart - home of Rick Stirling, games artist, designer, egotist and raconteur » Blog Archive » I’ve moved the header images, and fixed the normal map post Mon, 28 Aug 2006 10:51:56 +0000 http://www.rsart.co.uk/2006/08/27/green-tangent-space-normal-maps-2/#comment-396 [...] In the normal mapping post, I had said the red channel gets 16 bits all to itself - in fact it is 8. Unless a coder tells me otherwise. [...] [...] In the normal mapping post, I had said the red channel gets 16 bits all to itself – in fact it is 8. Unless a coder tells me otherwise. [...]

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