Copy Global Transform: Mirrored #105039

New Issue

Sybren A. Stüvel · 2023-02-21T18:39:03+01:00

Sybren A. Stüvel commented

2023-02-21 18:39:03 +01:00

By request of @PabloFournier.

The Copy Global Transform add-on could get a "mirror across bone" option. This would need a few extra parameters:

Object pointer & bone name
'Paste Flipped' boolean property for the 'Paste' operator.

The workflow would looks something like:

Pick a bone, press the "Use as Mirror Reference" button. The add-on now uses this until you pick something else. Or use the regular way to pick the bone (picker for armature, then type the bone name).
Pick a mirror axis that makes sense for that bone. Again, add-on uses this until something else is picked.
'Copy' with the already-existing button.
'Paste' with the new button, which uses the remembered settings to do the mirroring.

The mirroring works like:

Get MAT, the world-space matrix that was copied.
Compute the world-space matrix of the 'mirror bone' MIRROR
Transform MAT to the space local to MIRROR, i.e. multiply with MIRROR.inversed()
Flip MAT so that it's actually mirrored
Transform the now-flipped MAT to world space again, i.e. multiply with MIRROR.
Paste MAT just like the add-on always does.

By request of @PabloFournier. The Copy Global Transform add-on could get a "mirror across bone" option. This would need a few extra parameters: - Object pointer & bone name - 'Paste Flipped' boolean property for the 'Paste' operator. The workflow would looks something like: - Pick a bone, press the "Use as Mirror Reference" button. The add-on now uses this until you pick something else. Or use the regular way to pick the bone (picker for armature, then type the bone name). - Pick a mirror axis that makes sense for that bone. Again, add-on uses this until something else is picked. - 'Copy' with the already-existing button. - 'Paste' with the new button, which uses the remembered settings to do the mirroring. The mirroring works like: - Get `MAT`, the world-space matrix that was copied. - Compute the world-space matrix of the 'mirror bone' `MIRROR` - Transform `MAT` to the space local to `MIRROR`, i.e. multiply with `MIRROR.inversed()` - Flip `MAT` so that it's actually mirrored - Transform the now-flipped `MAT` to world space again, i.e. multiply with `MIRROR`. - Paste `MAT` just like the add-on always does.

Sybren A. Stüvel added the

labels 2023-02-21 18:39:23 +01:00

Sybren A. Stüvel added this to the Animation & Rigging project 2023-02-21 18:39:28 +01:00

Sybren A. Stüvel self-assigned this 2023-02-23 11:35:30 +01:00

Sybren A. Stüvel commented

2023-03-09 13:01:57 +01:00

The work is done, and will be presented at today's Animation & Rigging module meeting.

The work is done, and will be presented at today's [Animation & Rigging module meeting](https://devtalk.blender.org/t/2023-03-09-animation-rigging-module-meeting-upcoming/28204).

Sybren A. Stüvel commented

2023-04-17 11:14:48 +02:00

I've documented the new features: https://docs.blender.org/manual/en/3.6/addons/animation/copy_global_transform.html

Sybren A. Stüvel removed this from the Animation & Rigging project 2023-04-17 11:14:56 +02:00

Sybren A. Stüvel closed this issue

2023-04-17 11:15:00 +02:00

Blender Bot added the

Status

Archived

label 2023-04-17 11:15:02 +02:00

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