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Does this use the same coordinate space[1] as Maya , or does it use the same coordinate space as Blender ? Blender has no end of hidden trouble importing to Un
by tezza 8y ago
Does this use the same coordinate space[1] as Maya , or does it use the same coordinate space as Blender ?
Blender has no end of hidden trouble importing to Unity because Unity chose to be the same as Maya
[1] https://blender.stackexchange.com/questions/471/is-it-possible-to-make-blender-a-y-up-world https://blender.stackexchange.com/questions/471/is-it-possib...
- sneak 8y agoTIL. The fact that gaming and Maya use one (Y-up) and that CAD and Blender use another (Z-up) brings the classic xkcd to mind. https://xkcd.com/927/ https://xkcd.com/927/
- swsieber 8y agoThe fact that there are only 2 makes me think that it doesn't apply though. I just hope nobody trise to go make a third.
- TeMPOraL 8y agoThere are also left-handed and right-handed coordinate systems...
- pzone 8y agoThis is correct. Most CG and 3d software (Max, Maya, Blender, CAD) uses a right handed coordinate system, which matches the convention in physics, however they vary in their choice of Y up or Z up. Video games almost always use a left-handed coordinate system with Y up. This is because DirectX and OpenGL chose to represent pixels on-screen with (X,Y) coordinates with the Z coordinate increasing as rays extend from the eye outward.
- swsieber 8y agoWow, I had no idea it was so varied
- TeMPOraL 8y agoTo add to the confusion, while in both OpenGL and DirectX treat Z axis as depth, DirectX uses a left-handed coordinate system, while OpenGL uses mostly[0] right-handed one. -- [0] - https://stackoverflow.com/questions/4124041/is-opengl-coordinate-system-left-handed-or-right-handed https://stackoverflow.com/questions/4124041/is-opengl-coordi...
- blattimwind 8y agoOpenGL-the-interface is kinda neither (screenspace aside), since the application supplies/does all transformations (glFrustum and friends are long deprecated).
- Impossible 8y agoThere are more than two, Unreal has a coordinate system so special that Tim Sweeney apologized for it. https://mobile.twitter.com/timsweeneyepic/status/952661474501111808 https://mobile.twitter.com/timsweeneyepic/status/95266147450...
- Narann 8y agoMost CGI software where in-house software before being commercial. So the "what others do?" question never popped. :)
- throwaway2016a 8y agoI think that XKCD only really applies in systems where there is an infinite number of possible ways to do something. While there are a lot of ways you can configure a coordinate system the number of reasonable / non-intentionally obtuse ways is finite.
- huxingyi 8y agoDust3D use right-handed coordinate space, X - front view, Z - side view, Y - up. I am not quite sure what exactly coordinate space other software use, but I make sure the exported fbx looks as the same in Unity, and the exported glb looks as the same in Godot.
- starbeast 8y agoIf the fbx loads into Unity fine, are you not using a left handed system, or are you flipping it on export? edit - I'm an idiot, Unity does its own conversion to left handed on import.
- iKlsR 8y agoOT: First time ever seeing a post of mine `randomly` linked here on HN. :)