I am about to rig up my model for animating in my project. I have Created this Character following the R15 standard. However this model has many parts as children for each body part. Do I have to use Motor6D to keep everything “welded” in the proper place? Or can I use regular Welds, or Weld Constraints to attach non animated parts to my moving parts?
Here is a picture to show how I’ve laid out my hierarchy for this model:

I ask this because if I use Motor6D’s to keep everything attached, the rigging process will become very confusing to work out. My goal is to keep it all as clean as I can for rigging. So what are my options?
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I think you would just use a normal weld, not weld constraint, but a weld, to weld the children of the limbs. So like Part_08 - Part_12 would all be welded to the LeftUpperArm. You’d only use Motor6Ds on the limbs, so the right foot connects to rightlowerleg, which connects to rightupperleg, which connects to lower torso, which connects to upper torso(not sure actually), all with a Motor6D so that you can move them when animating. If you just used regular welds or weld constraint, you wouldn’t be able to animate them. I’ve never actually done something like this, so I’m not sure
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I followed your advice with using regular welds and it all worked as I intended. Thanks!
For rigging I made the HumanoidRootPart the lower torso and rigged it out from there. It all plays very well when testing with Roblox default animations.
Here is a pic showing what I did In case someone else needs help with this in the future:
