$ssbump: Difference between revisions
(This tut should no longer be used, as it's for an Older ersion of ssbump creation, and completely now inaccurate.) |
TomEdwards (talk | contribs) (→Creating self-shadowing bump maps: poking at beta release) |
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== Creating self-shadowing bump maps == | == Creating self-shadowing bump maps == | ||
{{bug|Only the version of height2ssbump in the current [[SDK Beta]] works.}} | |||
You need to use '''<code>height2ssbump</code>''', a [[command line]] SDK tool. The command is: | |||
height2ssbump <options> <path\file.tga> <[[float]]|bumpscale> | |||
The output is height2ssbump.tga, in the same folder as the input file. <code>Bumpscale</code> controls the intensity of the ssbump (i.e. coarseness of the surface); 60 is a good starting value. | |||
{{note|Bizarrely, the tool examines ''only the [[alpha channel]] of the input TGA''. The original alpha channel will be passed on to the output TGA, but serves no purpose and should be deleted.}} | |||
=== Options === | |||
;<path/filename> | ;<path/filename> | ||
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:Set smoothing filter radius (default 10; 0 disables). | :Set smoothing filter radius (default 10; 0 disables). | ||
;-n | ;-n | ||
:Generate a conventional normal map. | :Generate a conventional normal map (height-bump.tga). | ||
;-A | ;-A | ||
:Generate ambient occlusion in the alpha channel. | :Generate ambient occlusion in the alpha channel. | ||
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=== Creating ssbumps manually === | === Creating ssbumps manually === | ||
Here are the different ways of manually creating ssbumps without the real tools. | Here are the different ways of manually creating ssbumps without the real tools. | ||
*[http://ssbump-generator.synthasite.com SSbump Generator 2.0] - Third Party tool | *[http://ssbump-generator.synthasite.com SSbump Generator 2.0] - Third Party tool | ||
[[Category:List of Shader Parameters|S]] | [[Category:List of Shader Parameters|S]] | ||
Revision as of 16:47, 16 March 2009
$ssbump is a boolean material parameter that flags a $bumpmap as being self-shadowing. It is only supported with LightmappedGeneric and requires the Orange Box.
You can read more about the technology behind it in this paper.
Tip:Self-shadowed normal mapping is actually faster than the standard method!Example
LightmappedGeneric
{
$basetexture nature/rockwall_cave02a
$surfaceprop concrete
$bumpmap nature/rockwall_cave_02a_height-ssbump
$ssbump 1
}
Limitations
The shadows cast by the bump map are baked into the texture, meaning that they can only appear in one of three predefined locations. If a light is arriving on the surface between these angles the nearest available shadows will be blended between, producing an acceptable but hardly ideal image.
It's therefore best to consider the direction from which your material will be predominantly lit from when creating it, bearing in mind that at least one of its edges will have to do without proper shadowing!
Creating self-shadowing bump maps
You need to use height2ssbump, a command line SDK tool. The command is:
height2ssbump <options> <path\file.tga> <float|bumpscale>
The output is height2ssbump.tga, in the same folder as the input file. Bumpscale controls the intensity of the ssbump (i.e. coarseness of the surface); 60 is a good starting value.
Note:Bizarrely, the tool examines only the alpha channel of the input TGA. The original alpha channel will be passed on to the output TGA, but serves no purpose and should be deleted.Options
- <path/filename>
- The source heightmap (TGA format).
- -r <int>
- Set the number of 'rays' (default 250). More rays take more time.
- -f <int>
- Set smoothing filter radius (default 10; 0 disables).
- -n
- Generate a conventional normal map (height-bump.tga).
- -A
- Generate ambient occlusion in the alpha channel.
- -D
- Write out filtered result as
filtered.tga.
Creating ssbumps manually
Here are the different ways of manually creating ssbumps without the real tools.
- SSbump Generator 2.0 - Third Party tool