retargeting addon

Dodo2207

Hey everyone,
I try to write an retargeting addon for one rig to another. That would be really useful for working with a mocap suit like the coremotion one.

My focus for the addon is simple. I know it might be easier to write a function or something similar but I dont know how. Thats why I try doing it this way.

It need to add copy rotation and copy location constraint to a spezified rig in the code. Spezified because its easier to do it as a phyton beginner.
It need to target your bvh file or motioncapture rig (spezified in code) and subtarget the bone.

Here is what I have so far

My issue:
After setting the targeter (imported bvh rig) up and scaled it by the right facter. It select my mcrig and goes in pose mode. That works fine. After adding the copy rotation constraint and add the target and subtarget I want to select the next bone (Torso) but it doesnt work. It adds the second copy rotation constraint on my first bone (Head) instead on (Torso).

Maybe you can help me out

PS: script file is attached
Dominik

retargeting.txt

1kB

daylanKifky

Hi, I can't access the uploaded script. There's an issue with some filetypes in the forum, we will fix it asap. In the meantime could you use pastebin or similar service to share your script?

If I got this right what you are atttempting is to convert the animation in a a given armature (let's call it SOURCE) to another one with a different base pose (TARGET) is that correct?

Both armatures have to have the same bone count, otherwise the conversion would be really tricky.

We made script to do it some time ago. It was made in Blender 2.79, so there might be some incompatibilities with 2.8x. Instead of using constrains we set the rotation for each bone in TARGET on each keyframe. In order to get the rotation we calculate the difference in orientation on rest pose at the beginning.
Let me know if it helps

Dodo2207

Hi DaylanKifky,

Thanks for your answer. Yeah I will translate the motion from one armature to another. I know different bonecounts made it more tricky but its fine. I tested it out manuel and it worked.

So I want to write a script where it access the posemode bone 1 add copy rot and copy loc and target/subtarget (to my mcrig) the bones from the source (the imported bvh rig). After adding the first constrainsts it need to target bone 2 of my mcrig and do the same with different target and subtarget.

My main issue is that I dont know how to select another bone in posemode. After trying manuell to click it in Blender it wont show any commandline or phyton line in the Blender info.

I will upload my script to pastebin or something similar and share it here.

The Blender 2.79 didnt help because I try a different way via bone constraints because that work with my target and source rig perfectly.

Still thanks to your help 👍

Dodo2207

I know its a bit "smallthinking" to write the script for "only" one special rig but its my first try to write a script. IF its work Ill try to make it more flexible for any kind of rig. But first step one and then step 2 😅

Dodo2207

Here is the pastebin link

daylanKifky

I haven't carefully looked at your script. But what I can spot right away is that the line

38. | bpy.data.objects["mcrig"].data.bones["Torso"].active

is doing nothing.
Perhaps you intended to do something like:

bpy.data.objects["mcrig"].data.bones["Torso"].active = True

daylanKifky

Well, actually my last message was wrong.

This statement

bpy.data.objects["mcrig"].data.bones["Torso"]

is returning a reference to an object of type Bone which belongs to the Armature data. (Keep in mind that in blender there are also PoseBones which belong to the Object).

The Bone type doesn't have an active property. Instead if you want to set a Bone as active you have to go like:

ob  = bpy.data.objects["mcrig"]
ob.data.bones.active = ob.data.bones["head"]

The active property belongs to the Armature.bones collection

Dodo2207

@daylanKifky,

thank you soooooo much it worked 🙂

Ill keep the post up to date with my progress.

Dodo2207

Hey everyone,

my script is done. Give it a try:

If you have some feedback, please have in mind Im a python beginner 🙂

Have fun with the script

Dodo2207