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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...
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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.
  7. 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):...
  8. @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...
  9. 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...
  15. 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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    Maybe we get an answer from khronos via glTF team...

    Maybe we get an answer from khronos via glTF team through this issue: https://github.com/KhronosGroup/glTF/issues/824 but they may not want to answer COLLADA issue

    Blender multiplies this value by...
  17. I've no idea what COLLADA-CTS is, when I finished...

    I've no idea what COLLADA-CTS is, when I finished initial release of my lib I may try to learn/integrate it

    fx composer didn't worked on my Windows 10 :/
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    Yes I'm dividing COLLADA value by 2 to get cutoff...

    Yes I'm dividing COLLADA value by 2 to get cutoff angle (light angle) :) I think falloff_angle is full angle of cone not half



    Thanks
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    The dot product is negative in between 90 and 180...

    The dot product is negative in between 90 and 180 (http://www.mvps.org/DirectX/articles/math/dot/index.htm):



    Probably fixed-OpenGL pipeline doesn't implement case 3, but it seems it is a...
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    Yeah I saw, sorry to hear that! According...

    Yeah I saw, sorry to hear that!



    According to OpenGL fixed pipeline specs (https://www.opengl.org/sdk/docs/man2/xhtml/glLight.xml) 180 is special case, probably for disable spotlight as default...
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    One addition, I've took a look at Blender source...

    One addition, I've took a look at Blender source and it seems falloff_angle is whole angle of spot shape:



    light.spot_cutoff = RAD2DEGF(la->spotsize * 0.5f);
    light.spot_exponent = 128.0f *...
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    Shape of spotlight is cone and cone has angle but...

    Shape of spotlight is cone and cone has angle but my confusion is that is it full angle or half angle :/ Actually in fixed OpenGL 180d is default angle for spotlight like COLLADA and angle must be...
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    Sorry it is a typo (consistently), Yeah a...

    Sorry it is a typo (consistently),



    Yeah a formula would be really helpful, I've found some formulas but some of them are related to inner/outer cone, AFAIK it is DirectX term not OpenGL (maybe...
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    Spotlight properties

    I'm trying to render spotlight enabled scene but I've some trouble about fallof_angle :/ What is fallof_angle exactly? I really look a dozen of books/web pages and not sure how to use this param. In...
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    PS: It really seems a joke :) I think COLLADA...

    PS: It really seems a joke :) I think COLLADA arrays are better than <triangle> even compressions or other reasons. Because in the future next gen CPUs may parse all array (or single...
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