Colliders

My implementation of Bell Collider. It supports multiple rings and viewport 2.0 debug drawing. It uses mesh intersection approach.

Youtube: https://www.youtube.com/watch?v=89Dbd-n8EzY

How to run

Compile C++ plugin for Maya version you want.

You need Visual Studio and CMake to do this. You can find precompiled plugins for Maya in plugins folder.

Python script to create Bell Collider node with some bell rings.

import pymel.core as pm

name = "test"
numRings = 2
numOutJoints = 6

grp = pm.createNode("transform", n=name+"_bellCollider_group")
grp.addAttr("scaleFactor", min=0.001, dv=1, k=True)
grp.scaleFactor >> grp.sx
grp.scaleFactor >> grp.sy
grp.scaleFactor >> grp.sz
grp.sx.set(l=True, k=False)
grp.sy.set(l=True, k=False)
grp.sz.set(l=True, k=False)

bellCollider = pm.createNode("bellCollider", n=name+"_bellCollider")
bellColliderParent = bellCollider.getParent()
bellColliderParent.rename(name+"_bellCollider_transform")
bellColliderParent.t.lock()
bellColliderParent.r.lock()
bellColliderParent.s.lock()
grp | bellColliderParent

bell = pm.createNode("transform", n=name+"_bell_transform", p=grp)
bell.m >> bellCollider.bellMatrix

for i in range(numRings):
    ring = pm.createNode("transform", n=name+"_ring_"+str(i+1)+"_transform", p=grp)
    ring.s.set([0.2, 2, 0.2])
    ring.m >> bellCollider.ringMatrix[i]

curve = pm.createNode("nurbsCurve", n=name+"_bellCollider_curveShape")
curve.getParent().rename(name+"_bellCollider_curve")
grp | curve
bellCollider.outputCurve >> curve.create

if numOutJoints > 0:
    bellCollider.positionCount.set(numOutJoints)
    for i in range(numOutJoints):
        tr = pm.createNode("transform", n=name+"_"+str(i+1)+"_transform", p=grp)
        bellCollider.outputPositions[i] >> tr.t
        bellCollider.outputRotations[i] >> tr.r