How would you rig multiple breasts along the torso? With the spine twisting and bending. Especially the ones that are near the crotch, given how they will disappear when the model bends over (I also need to find how to make the belly bulge when doing that) or get buried in the pelvis when the torso rotates.I tried a combination of Copy Rotation, Copy Location, but I'm a beginner.I'm doing this in blender btw.
Well these are small enough to just use soft body dynamics. I used to always use 3 joints for the spine but recently, after seeing a lot of pro rigs not doing that, I stopped and just have a lower back and an upper back. If you have to just joints for some reason then you want a corrwctive bone for the bell bulge. Every breast pair should have a common root joint. Those root joints would be the children of the upper back, lower back, corrective belly joint, and the pelvis joint.But like I said these are so small you could just stick to corrective blend shapes and dynamics to control them.
>>1028160Use rigify and copy the breast bones to the other pairs before parenting the mesh to the skeleton.
>>1028174I haven't thought about using soft body but since it's simulation I'm not sure if it's a thing where I want to go. I'll try maybe later.The thing is that since the breasts each have a bone inside, they are quite solid and like to get into the body, or to protrude without any deformation when I rotate the torso.>corrective blend shapesI'm new to rigging, and I always had trouble when using blend shapes, I find it to be a pain when you edit the rig or apply modifiers.Maybe I could use a driver bone instead? Or maybe bendy bones?>so smallUh rude >:(>>1028175I'm trying to not use rigify because I want to use a custom armature that has features that rigify doesn't have (like a knee bone and a glute bone with Copy Rotation from the femur)
>>1028182>No rigifyHave you tried parenting the breast bones to the nearest spine bones?
>>1028184Yes, it works fine, but it's just that they're now solid and "pierce" through the body when it bend over, or stick out when it bend backwards.And I also wonder how to make it work in conjunction with the belly bulging when bending over.
>>1028185One alternative is you can unparent them and put an armature bone constraint on them. That one works the same it would on a vertex, combining the influence of several parent bones, but it won't auto-weight, you'll need to look up the bone and weight values from a neighboring vertex in edit mode and then set that in the constraint
>>1028185You going to have this push and pull when overlaying soft bodies like a stomach and breasts. Normal breasts sit on a mostly solid ribcage. You want the abdomen to deform when the sline twists and bends but keep the breasts stable.The gluten bone concept is a helpful beginning. The gluten bone is an intermediary between the femur and the pelvis. Because the gluten deformation is so extreme when the femur lifts it causes the gluten to lose all of its volume. The gluten bone bridges the rotation of the joints so the verts have a reference for where they should go. The same with these breasts. There needs to he an intermediary joint between the sline and the breast. The breast joint will have a very high envelope value on the breasts, because that is how you prevent them from deforming. Now you have this soft tummy with rock hard breasts clanging around. A second joint inbetween the spine and the breast to give that interface between the two forms a reference so they can blend together.You are trying to make a very somplocated thing right now. I am.normally not an advocate for dynamics because they get super complicated and younlose.control, but your use case is already really complex. So it might be better to use soft bodies in this case.
>>1028203I'm not really sure if really I understood what you meant, I tried a similar thing like my glute bone constraint but it gave bad deformation.I'm trying another way, using a bone extending from the spine to the belly with a Copy Rotation constraint to keep belly volume bending over and stretch when bending back.I then added a Copy Rotation on the bottom boob bone with a small influence, and to keep it from going inside the body I added a Driver on the boob'z Z location to transform the spine's X rotation with max(0, var) * -0.03 and gives the following result in picrel.On the right you can see the driver making the boob go down a little when bending over.But I'm not sure if I want to go this way and just give in the soft body transform.Rigging is such a time sink :(
