If you don't want it to look like solid water you probably need to turn the knot from a solid object to a tube with thin walls - i.e. generate a thin 'shell' from the object.
I don't know the Lightwave tools - but one way could be 'Uniform Mesh Resampling' in Meshlab. Might turn out like a bottle though because a really thin object is hard to create that way.
Another easier way of course is not to use ior/refraction in the material - so the light passes straight through. But that might be too simple ...
I don't know the Lightwave tools - but one way could be 'Uniform Mesh Resampling' in Meshlab. Might turn out like a bottle though because a really thin object is hard to create that way.
Another easier way of course is not to use ior/refraction in the material - so the light passes straight through. But that might be too simple ...
Cool challenge!