Models are removed from simulation when not in use. Fixes boundingbox errors.
Models are removed from simulation when not in use. Fixes boundingbox errors.

We may want to refactor this module. We might not need the object array
at all.

steptools/NC.js,steptools/NC.js,steptools/StepNCViewer,steptools/StepNCViewer,steptools/NC.js,steptools/StepNCViewer