Conical Rotation Limits for Ragdoll

llynx · 01-09-2011 04:00 AM

I've noticed that quite often ragdoll physics results in "awkward" bending and rotation.

Is there a way to implement conical rotation limits between bones in a skeleton?

[I've experimented with dummy ragdoll bones as rotation limiters with moderate success (relatively accurate joint rotation but sometimes results in limbs "floating" above the ground) but still doesn't stop things like 180 degree rotation of a head]

**Esenthel** · 01-10-2011 05:19 PM

Hi,
What is your naming system for bones? (what names)

llynx · 01-10-2011 06:35 PM

I have been working with ragdoll bone orientations and can fix the rotation issue based on rotation differences with parent bones, and should be able to work something out to limit the angles bones.

Unless there is a better way of doing this?

**Esenthel** · 01-10-2011 08:26 PM

currently the Ragdoll class creates the joints and sets the angular limits automatically.
it is dependent on the bone names a little.

something like that:

Code:

if(Equal(rb.name,"Head") || Equal(rb.name,"Bip01_Head"))

               {

                  if(Equal(rp.name,"Neck"  ) || Equal(rb.name,"Bip01_Neck"      ))_joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad(30), DegToRad(35));

                  else                                                            _joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad(50), DegToRad(40));

               }else

               if(Equal(rb.name,"Neck"     ) || Equal(rb.name,"Bip01_Neck"      ))_joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad( 20), DegToRad( 5));else

               if(Equal(rb.name,"ShoulderL") || Equal(rb.name,"Bip01_L_Clavicle"))_joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad(  5), DegToRad( 5));else

               if(Equal(rb.name,"ShoulderR") || Equal(rb.name,"Bip01_R_Clavicle"))_joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad(  5), DegToRad( 5));else

               if(Equal(rb.name,"ArmLU"    ) || Equal(rb.name,"Bip01_L_UpperArm"))_joints.New().createBodySpherical(rb.actor, rp.actor, sb.pos*_scale, sb.dir, DegToRad( 80), DegToRad(30));else

currently this is built-in and can't be modified

llynx · 01-10-2011 10:06 PM

(01-10-2011 08:26 PM)Esenthel Wrote: currently this is built-in and can't be modified

One of the characters I've modeled needs some fairly tight angular limits so with these fixed constants it won't really help in all situations, (esp when modeling aliens/animals with non-human based joints)

Letting us specify the limits would be useful, but even in the given the standard human mesh/skeleton included (with the standard bone naming scheme) from the EESDK I've seen some crazy bends and twists.

I'll continue my coding until we have more direct control over this.

Conical Rotation Limits for Ragdoll
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