COLLADA to WebGL (GDC 2013 presentation)
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The document discusses using COLLADA to bring 3D content created in Unity to WebGL using Turbulenz and the Fl4re COLLADA exporter. It provides examples of exporting animations, physics, lighting, and textures from Unity to Turbulenz via COLLADA. While there are some limitations, Turbulenz handles most COLLADA features well. Future technologies like glTF and REST3D may make the process more efficient.
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COLLADA to WebGL (GDC 2013 presentation)
- 1. COLLADA to WebGL Experimenting using COLLADA to bring content from Unity to WebGL using Turbulenz and Fl4re exporter Rémi Arnaud remi@acm.org
- 2. Content creation Physics Animations Audio Images Script 3D model game …
- 3. Content ‘Pipeline’ Modeler Object files Multiple indexes, Quads Animations Animation files Clips, bézier, complex + skins/bones Transformation graph Textures, Shaders Shader files Vertex / Fragment shaders Physics + psd Physics files Convex Mesh, collliders Optimization Binary files Single index, triangles Packaging DXTs, simplified scene package file Compressed folder
- 4. COLLADA – intermediate format Modeler COLLADA Multiple indexes, Quads Animations COLLADA Clips, bézier, complex Transformation graph Textures, Shaders COLLADA Vertex / Fragment shaders Physics COLLADA Convex Mesh, collliders Optimization COLLADA Single index, triangles Packaging DXTs, compressed anims package file Compressed folder
- 5. COLLADA Refinery (2007) COLLADA Refinery 2.0.3 conditionners Axisconverter Compress Transforms Stipper Image conversion Axis transform Coherencytest ** Use this !! Copyrighter Deindexer Triangulate Vertex cache optimization Optimizer Packager https://collada.org/mediawiki/index.php/COLLADA_Refinery
- 6. COLLADA interchange? Modeler A Modeler B Animations A Animations B Textures, Shaders A Textures, Shaders B Physics A Physics B Optimization A Optimization B Packaging Packaging
- 7. COLLADA interchange? Modeler A Modeler B COLLADA Animations A Animations B COLLADA Textures, Shaders A Textures, Shaders B COLLADA Physics A Physics B COLLADA Optimization A Optimization B COLLADA Packaging Packaging
- 8. COLLADA interchange? Modeler A Modeler B Animations A Animations B Textures, Shaders A Textures, Shaders B Physics A Physics B Optimization A Optimization B Packaging Packaging
- 9. COLLADA loader? Modeler A Animations A Textures, Shaders A Physics A Optimization A Packaging
- 10. COLLADA loader? Modeler A COLLADA My modeler Animations A Textures, Shaders A Physics A Optimization A Packaging
- 11. COLLADA loader? Modeler A Polygons Animations A multiple indexes image format Textures, Shaders A mesh optimization, split complex transform hierarchy no shader programs Physics A no collision volumes verbose text (xml) parsing Optimization A Packaging My game
- 12. COLLADA – more tools available? Modeler Max Maya Blender Modo Cinema4D XSI Animations Poser DAZ Mixamo Textures, Shaders Photoshop FX Composer Render Monkey Physics Bullet PhysX Havok Optimization Simplygon Okino Atangeo MeshLab Packaging WebGL packaging
- 13. Unity Editor Fbx or simple COLLADA (e.g. no physics, morphing, shaders..) Modeler Max Maya Blender Modo Cinema4D XSI C Animations o Mecanim n t Textures, Shaders e Shader Factory n t Physics PhysX p i Optimization p e Built-in l i Packaging n IOS, Andoid, PC, Web (plugin), Flash e Unity Engine http://unity3d.com/
- 14. Turbulenz SDK (WebGL) Modeler Max Maya Blender Modo Cinema4D XSI Animations Poser DAZ Mixamo Textures, Shaders Photoshop FX Composer Render Monkey Imports COLLADA with physics Physics Bullet PhysX Havok Optimization dae2json Packaging json2tar , mapping.json, cgfx2json WebGL Turbulenz engine http://biz.turbulenz.com/developers
- 15. Unity Editor -> WebGL Turbulenz using COLLADA ! Modeler Editor Exporter Converter webG L engine Max Unity COLLADA dae2json Turbulenz Maya Blender … http://u3d.as/content/fl4re/collada-dae-exporter-for-unity/3cC
- 16. WIP: Unity Editor -> WebGL using COLLADA and glTF Max Unity COLLADA COLLADA2GLTF Turbulenz Modeler Editor Exporter converter WebGL Maya Threejs Blender ... … https://github.com/KhronosGroup/glTF
- 17. WIP: Unity Editor -> WebGL using COLLADA , glTF and REST3D converter glTF REST3D REST3D Modeler Editor Exporter WebGL Max Unity COLLADA Turbulenz Maya Threejs Blender ... … http://rest3d.org
- 18. Exporter UI
- 19. Animated Skinned mesh Turbulenz Yes!! (Picky on hierarchy, weapons attachment currently not by default in viewer app) Unity Preview Yes!! (would love to select clip in preview)
- 20. Physics ? Unity - Need to have camera and light to see physics Turbulenz In ‘run’ mode Yes!! (some limitations getting resolved ) Preview - No physics
- 21. Lightmap (glow) ? Unity Turbulenz - user provided shader mapping to enable advanced lighting Preview
- 22. animations? Unity - SpiderRobots are ‘prefabs’ Sharing the same animations- Turbulenz Yes!! - Some minor Preview animation glitches - Works only if animations are shared!
- 23. Summary • Unity -> COLLADA -> Turbulenz – COLLADA fulfill its promises: • game developer can combine tools from different vendors – Turbulenz does a great job importing COLLADA • Remaining issues are being worked on – glTF / REST3D • Those technologies will make it even easier and more efficient to bring COLLADA to WebGL apps
- 24. Thank you • Links http://biz.turbulenz.com/developers https://collada.org/mediawiki/index.php/COLLADA_Refinery http://unity3d.com/unity/download/ http://u3d.as/content/fl4re/collada-dae-exporter-for-unity/3cC https://github.com/KhronosGroup/glTF http://rest3d.org • Questions? remi (at) acm (dot) com
Notas do Editor
- All this content need to get in the game, somehow
- Typical content toolchain – it is a pipeline. Each stage has its own tools its own format.
- Ok, so no I can interchange tools, add more tools to pipeline, update tools. I don’t have to write exporters
- 6 years later, we are still doing the same things
- Exchanging physics with a texture tool ? Loading optimized data back in a modeler? Learning a modeler to use GLSL shaders?
- It’s really hard….
- Only provides final stage of COLLADA pipeline
- Turbulenz has limitations on the bone hierarchy
- Demo -> collisions.dae
- No glow map in turbulenz