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  1. Replies
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    Do not worry, if your questions are related to...

    Do not worry, if your questions are related to COLLADA spec, you can ask simple or complex questions.

    COLLADA uses multi-index buffer to store primitive indices. It means that you can use...
  2. Because COLLADA uses multi-index buffer. In this...

    Because COLLADA uses multi-index buffer. In this may arrays may have different lengths.



    What do you mean?
  3. Cesium has great community, you may want to move...

    Cesium has great community, you may want to move this issue to there: https://github.com/AnalyticalGraphicsInc/cesium by creating new issue: https://github.com/AnalyticalGraphicsInc/cesium/issues/new
  4. It doesn't matter what data you put in COLLADA...

    It doesn't matter what data you put in COLLADA file as semantic or as extra/extension. Importer and/or renderer must parse and understand that data, otherwise it will no affect. It is not issue...
  5. Here an example of two-sided rendering:...

    Here an example of two-sided rendering: https://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Two-Sided_Surfaces

    If you have normal like vNormal in fragment shader, then you could use -vNormal as...
  6. I can't say I understand what are you trying to...

    I can't say I understand what are you trying to do, so I'll give a try;

    I think this is related to other question. Again COLLADA defines face attribute for cube mapping. Maybe this is what you are...
  7. Are you trying to render double-sided surface, if...

    Are you trying to render double-sided surface, if not what do you mean with side? AFAIK, COLLADA and most other formats only specifies an image and texcoords for texture, not side. If you want to...
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    After followed a few tutorials about sport light...

    After followed a few tutorials about sport light implementation, you can do what you want here. All light properties already defined in the spec.
  9. Thread: Collada fresnel

    by recp
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    The current version of COLLADA does not support...

    The current version of COLLADA does not support PBR materials. In the future maybe, with extensions maybe. Probably you can get that value in COLLADA file with Blender extension if they write it to...
  10. Thread: Light

    by recp
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    Hope you are not a spam bot, I'm not sure :) ...

    Hope you are not a spam bot, I'm not sure :)

    Yes default light direction is as what you described (0,0,-1).


    Actually you already answered your question here. You must apply light transform...
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    It would be great to collect some bugs and list...

    It would be great to collect some bugs and list them in some place (pinned post or/and a wiki page). We and/or some others may fix some critical bugs by reading this post or wiki page.

    By the way...
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    yeah this is what I was talking about. Opaque...

    yeah this is what I was talking about. Opaque object's transparency was exported as 0 which had to be 1. I fixed that for old versions of SketchUp while importing.



    Maybe I should contact...
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    Known exporter bugs

    Recently I have implemented transparency (all modes I think) in my render engine. It seems some tools exported transparency parameter wrong in past. They may have fixed that bug now, but there are...
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    +1 Plus; if you develop a tool to export it,...

    +1

    Plus; if you develop a tool to export it, then I suggest that test it with IDENTITY transforms first, maybe there is something wrong with transforms which causes different look
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    What do you mean with "if the normals where...

    What do you mean with "if the normals where inverted", if you invert normal then you change also ligting so only inside of mesh will get lights (if there is a light source). Probably this is why you...
  16. Thread: Collada texturing

    by recp
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    https://www.khronos.org/files/collada_spec_1_5.pdf...

    https://www.khronos.org/files/collada_spec_1_5.pdf
    https://www.khronos.org/files/collada_spec_1_4.pdf

    Check "Texturing" section in Chapter 7, it explains how to use texturing in COLLADA.
  17. Giorgio, there is also glTF format for runtime...

    Giorgio, there is also glTF format for runtime (http://github.com/khronosGroup/gltf),

    AFAIK, Cesium.js uses glTF to render 3D tiles (glTF + CityGML or more sources):...
  18. @remi, I'm so glad to see you here, ...

    @remi, I'm so glad to see you here,

    @giorgio.denunzio, if you have Blender then you can export a simple CUBE or other scene as COLLADA, COLLADA is default exporter of Blender.

    Most modeling...
  19. Do you mean wiki home page or official page...

    Do you mean wiki home page or official page (specs page)?

    I've parsed skin, morph but I've not rendered them yet, also I haven't worked on Physics yet, so at this time I'm afraid I can't help...
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    I'm not good at find good/cool names :) The first...

    I'm not good at find good/cool names :) The first name was assetio then it changed to assetkit because it is not just io ops. Maybe I can find better name in the future.

    You are right, 1.5 i...
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    My render results seem wrong because dae files...

    My render results seem wrong because dae files about falloff_angle don't have normals, this is why one of my render result was incorrect! I also fixed other's color by normalized eye vector :) now,...
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    My libraries about COLLADA/glTF

    I've published my libraries to Github:

    AssetKit: 3D asset loader based on COLLADA 1.5/gltF specs
    https://github.com/recp/assetkit

    AssetKit-GL: Load contents loaded from AssetKit to OpenGL...
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    I've fixed a bug related to spotlight/camera...

    I've fixed a bug related to spotlight/camera rotation and default light direction [0, 0, -1]

    I'm afraid fallof_angle * 0.5 gives me right angle, here screenshots (Test 2 folder):...
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    I like CTS project thanks for sharing it, there...

    I like CTS project thanks for sharing it, there is also render results in /Blessed/png folder, this is useful for comparing our rendering results.

    Also it seems my renderer has bugs when light or...
  25. Yep, I'm using macOS and virtual Windows 10...

    Yep, I'm using macOS and virtual Windows 10 Insider Preview (beta), I really want to use or test fx composer but it doesn't work even compatibility mode :/

    It seems CTS is good software to find...
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