Which axis should be pointing towards the descendent bone?

jsantell / THREE.IK

inverse kinematics for three.js

https://jsantell.github.io/THREE.IK

MIT License

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Which axis should be pointing towards the descendent bone? #1

Open jsantell opened 6 years ago

jsantell commented 6 years ago

Currently, bones orient to face down their positive Z axis, such that positive Y is their UP, like Object3D's are in three.js. Looking at other rigging solutions, can't seem to find any good or consistent arguments for any axis other than being consistent.

avaer commented 6 years ago

I've been working with rigs that use Y+ (blender's convention). https://blender.stackexchange.com/questions/15609/in-which-direction-should-bone-axes-be-oriented

I haven't seen any good arguments for any convention, but it might be nice to be able to specify the convention to the lib for easier application to whatever rig convention is being used 🤔.

mikebourbeauart commented 5 years ago

Maya generally does X+, so there might be a need to specify convention.