if (type == VT_CYLINDER) { rot.fromAngleAxis(-divergence, line.getDirection()); }
        public void prepare(ParticleGeometry particleGeom) {            line.getOrigin().set(axis.getOrigin());            line.getDirection().set(axis.getDirection());            if (transformWithScene) {                particleGeom.getEmitterTransform().multPoint(line.getOrigin());                particleGeom.getEmitterTransform().multNormal(line.getDirection());            }        }