Blender Git Commit Log
Git Commits -> Revision e91ea20
Revision e91ea20 by Alexander Gavrilov (master) September 3, 2019, 16:35 (GMT) |
Drivers: support decomposing rotation into swing followed by twist. In order to correctly drive corrective shape keys from a freely rotating organic joint it is very often found necessary to decompose the rotation into separate bending and twisting motions. This type of decomposition cannot be reproduced by any Euler order or a single quaternion. Instead this is done by using a helper bone with a Damped Track constraint aimed at the tail of the control to pick up the bending, and its helper child with Copy Transforms to separate the twist. Requiring two additional bones to drive a shape key or a correction bone seems inconvenient, so this implements the necessary math as new options in the recently introduced Rotation Mode dropdown of the Transform Channel driver variable type. The data is also accessible as a Transformation constraint input. The output is in the form of Quaternion-derived 'pseudo-angles', which for `Swing and Y Twist` would represent the following: * W: true bend angle, independent of bend direction. * Y: true twist angle. * X, Z: pseudo-angles representing the proportion of bending around X/Z. Reviewers: brecht Differential Revision: https://developer.blender.org/D5651 |
Commit Details:
Full Hash: e91ea20ebee800600ec073f9738b448778372453
Parent Commit: b3b59e3
Lines Changed: +85, -0