Xeolabs SceneJS → V0.7.9

Comments and changes to this ticket

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  CryptoQuick October 20th, 2010 @ 03:22 AM

  • Tag set to “texture”

  If you can, please be sure to support varying levels of transparency. Thanks! :)

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  Andreas Osowski October 20th, 2010 @ 03:01 PM

  Right, so, I did a quick dib at this and implemented alpha mapping I guess.
  See the screenshot (I guess the blackish lines around the transparent edges
  are "z-fighting"?)

  The only thing that still is missing somewhat is:
  When using alpha maps, opacity should be 1.
  However, the current approach (with opacity) does not permit this, so all occurrences (in shading/renderModule.js)
  of renderOpaqueNodes need to be replaced with renderTransparentNodes I guess.

  The best solution here would be calling renderTransparentNodes instead of renderOpaqueNodes when
  node.texState.hash != "__scenejs_no_tex" as we currently only create new textures as RGBA anyway.

  Or we could also argue that all non-transparent nodes have an opacity and alpha of 1 anyway so that therefore the renderOpaqueNodes isn't needed at all and we can use renderTransparentNodes everywhere which seems like the best solution to me tbh (I don't know whether that'd have some performance impact though).

  • scenejs_alpha_mapping.patch 2.5 KB
  • screenshot.png 184.9 KB
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  lindsay.kay (at xeolabs) October 21st, 2010 @ 02:40 PM

  In the Sirikata fork of GLGE - a "discard" keyword in GLSL, used for alpha transparency by the looks of it:

  http://github.com/sirikata/GLGE/commit/67c1ae074419927eb629bdad1f44...

  Perhaps not quite applicable to this case, but worth mentioning!

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  Andreas Osowski October 22nd, 2010 @ 09:29 AM

  "The discard keyword can only be used in fragment shaders. It causes the termination of the shader for the current fragment without writing to the frame buffer, or depth."

  I guess this might indeed be a nice feature in case the user wants to set a lower limit to transparency(possible performance boost?). I think that that should be an option for the scene or so though.

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  lindsay.kay (at xeolabs) October 23rd, 2010 @ 02:10 AM

  • Milestone changed from “V0.7.8” to “V0.7.9”