Are you un-premultiplying your fill before you composite it?
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Objectivo49
> Sent: 18-April-2006 16:17
> To: XSI(at)Softimage.COM
> Subject: Reflections with motion blur problem.
>
> Hello
>
> Yesterday I just found out one of
> our renders of a rolling and bouncing
> "paint can" had a small problem in compositing, as it showed
> a dark band that looked like the alpha channel didn't fit the colour:
>
> http://paragrama.net/manalokos/albums/album07/lata.jpg
>
> After some debugging I realized that this was not a problem
> originated on my material, but on the reflections themselves
> combined with motion blur.
>
> Here is a render of a sphere spinning very fast with 100%
> reflectivity, I notice 2 issues:
>
> http://paragrama.net/manalokos/albums/album07/bola.jpg
>
> 1 - The reflection is blurred, It shouldn't be at all!
> 2 - the dark band reappears
>
> Does anyone have a solution for the problem?
> I beleive this is a important issue and should be corrected.
>
> Best regards
> Filipe Alves
>
> Here is a script for a scene showing the problem:
>
> ----------------------------------------------
>
> CreatePrim "Sphere", "MeshSurface"
> SetValue "sphere.polymsh.geom.subdivu", 80 SetValue
> "sphere.polymsh.geom.subdivv", 80 CreatePrim "Sphere", "MeshSurface"
> Scale , 10.6428571428571, 10.6428571428571, 10.6428571428571,
> siRelative, siLocal, siObj, siXYZ, , True, , , , , , 0
> ApplyShader "Material\Constant", , , ,
> siLetLocalMaterialsOverlap SIApplyShaderToCnxPoint "Image",
> "Sources.Materials.DefaultLib.Material.Constant.color"
> CopyPaste , "Shaders\Texture\Mixers\Mix_2colors.Preset",
> "TransientObjectContainer"
> SetValue
> "TransientObjectContainer.Mix_2colors.base_color.red", 1
> SetValue
> "TransientObjectContainer.Mix_2colors.base_color.green", 1
> SetValue
> "TransientObjectContainer.Mix_2colors.base_color.red", 1
> SetValue
> "TransientObjectContainer.Mix_2colors.base_color.green", 1
> SetValue
> "TransientObjectContainer.Mix_2colors.base_color.blue", 1
> SIConnectShaderToCnxPoint
> "Sources.Materials.DefaultLib.Material.Constant.Image",
> "TransientObjectContainer.Mix_2colors.color1", False
> SIConnectShaderToCnxPoint "TransientObjectContainer.Mix_2colors",
> "Sources.Materials.DefaultLib.Material.Constant.color", False
> ActivateObjectSelTool SetAndToggleSelection "sphere", , True
> ActivateObjectSelTool ApplyShader , , , ,
> siLetLocalMaterialsOverlap SetValue
> "sphere.Material1.Phong.reflectivity.red", 1 SetValue
> "sphere.Material1.Phong.reflectivity.blue", 1 SetValue
> "sphere.Material1.Phong.reflectivity.red", 1 SetValue
> "sphere.Material1.Phong.reflectivity.blue", 1 SetValue
> "sphere.Material1.Phong.reflectivity.green", 1 SaveKey
> "sphere.kine.local.rotx,sphere.kine.local.roty,sphere.kine.loc
> al.rotz", 1 SetValue "PlayControl.Key", 11 SetValue
> "PlayControl.Current", 11 PrevFrame Rotate , 0, 1440, 0,
> siAbsolute, siPivot, siObj, siY, , , , , , , , 0 SaveKey
> "sphere.kine.local.rotx,sphere.kine.local.roty,sphere.kine.loc
> al.rotz", 10 SetValue "PlayControl.Key", 5 SetValue
> "PlayControl.Current", 5 InspectObj "ViewRenderOptions", , ,
> 1 SetValue "ViewRenderOptions.MotionBlur", True SetValue
> "ViewRenderOptions.MotionSteps", 10 ActivateObjectSelTool
> SetAndToggleSelection "sphere1", , True ActivateObjectSelTool
> CreateProjection "sphere1", siTxtSpherical,
> siTxtDefaultSpherical, "Texture_Support", "Texture_Projection"
> SetInstanceDataValue ,
> "Sources.Materials.DefaultLib.Material.Constant.Mix_2colors.Im
age.tspace_id",
> "Texture_Projection"
>
> -------------------------------------------------------------
>
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