Re: Making bump show in AO pass

[Andy Jones <andy(at)thefront.com>]

I don't know -- I'm just copying the log.  I think you are getting the 
old bumpmap shader which outputs a color (hence the color2Vector).  So, 
I think you'll need to use the bumpmap generator instead.  I never 
really even understood how the old bumpmap shader was supposed to work 
with a color output...  Did you try the second script I sent?  That 
should hopefully fix this.  Let me know if it works, and I'll post the 
update back to the list for people on older versions.

- Andy

Edmund Wong wrote:

> Not sure if it's correct but should the last few lines(missing 
> Color2Vector) be as below? Correct me if i'm wrong
>
> SIConnectShaderToCnxPoint "TransientObjectContainer.Fractal", 
> "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Color2Vector.Bumpmap.input 
> ", False
> CreateProjection "sphere", siTxtSpatial, siTxtDefaultSpherical, 
> "Texture_Support", "Texture_Projection"
> SetInstanceDataValue , 
> "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Color2Vector.Bumpmap.Fractal.tspace_id 
> ", "Texture_Projection"
> SetValue 
> "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Color2Vector.Bumpmap.Fractal.max.x", 
> 5
> SetValue 
> "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Color2Vector.Bumpmap.Fractal.max.y 
> ", 5
> SetValue 
> "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Color2Vector.Bumpmap.Fractal.max.z", 
> 5
>
>
> Cheers,
> Edmund
>
> On 5/22/07, *Andy Jones* <andy(at)thefront.com 
> <mailto:andy(at)thefront.com>> wrote:
>
>     In the past I've sometimes done a pass that is basically just a dot
>     product of the bumped and un-bumped normals.  This is of course an
>     over-simplification, but you can use this to obtain the self-occlusion
>     of the bump-map pattern assuming the surface patch is immediately
>     surrounded by a flat planar surface.  Given the general inaccuracy of
>     bump-maps anyway, it should work for what you need.  In theory, You
>     actually would need to remap the output color range from [-1,1] to
>     [0,1], as the vectors being perpendicular actually means 50%
>     occlusion,
>     not complete occlusion.  But in practice, I've found that I'm usually
>     having to remap the range pretty severely to taste in the comp anyway.
>     The following script just creates a simple example scene that should
>     give you the basic idea.
>
>     - Andy
>
>     CreatePrim "Sphere", "MeshSurface"
>     ApplyShader , , , , siLetLocalMaterialsOverlap
>     CopyPaste , "Shaders\Texture\Bump\Bumpmap.Preset",
>     "TransientObjectContainer"
>     CopyPaste , "Shaders\Texture\State\Vector_state.Preset",
>     "TransientObjectContainer"
>     SetValue "TransientObjectContainer.Vector_state.mode", 3
>     CopyPaste , "Shaders\Texture\Math\Vector_math_scalar.Preset",
>     "TransientObjectContainer"
>     SIConnectShaderToCnxPoint "TransientObjectContainer.Bumpmap",
>     "TransientObjectContainer.Vector_math_scalar.vector_input1", False
>     SIConnectShaderToCnxPoint " TransientObjectContainer.Vector_state",
>     "TransientObjectContainer.Vector_math_scalar.vector_input2", False
>     SetValue "TransientObjectContainer.Vector_math_scalar.mode", 1
>     SIConnectShaderToCnxPoint "
>     TransientObjectContainer.Vector_math_scalar",
>     "Sources.Materials.DefaultLib.Material.surface", False
>     CopyPaste , "Shaders\Texture\Fractal.Preset",
>     "TransientObjectContainer"
>     SIConnectShaderToCnxPoint " TransientObjectContainer.Fractal",
>     "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Bumpmap.input",
>     False
>     CreateProjection "sphere", siTxtSpatial, siTxtDefaultSpherical,
>     "Texture_Support", "Texture_Projection"
>     SetInstanceDataValue ,
>     "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Bumpmap.Fractal.tspace_id",
>     "Texture_Projection"
>     SetValue
>     "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Bumpmap.Fractal.max.x",
>     5
>     SetValue
>     "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Bumpmap.Fractal.max.y
>     ",
>     5
>     SetValue
>     "Sources.Materials.DefaultLib.Material.Scalar2color.Vector_math_scalar.Bumpmap.Fractal.max.z",
>     5
>
>
>     Peder Kallin wrote:
>
>     > Hey list!
>     >
>     > Do you guys have any tricks for making bumpmaps show in an AO
>     pass? I
>     > cant afford to render everything with displacement and thought
>     someone
>     > might have a solution for this? My scene now is quite heavy on the
>     > ambience lighting side so it doesnt matter what I do in my beauty
>     > pass, the bump doesnt show :(
>     >
>     > Sincerely
>     > Peder
>     >
>     >
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