The idea is to illustrate a sodium channel through the membrane of a nerve cell. It is basically a molecular pore that opens to admit a sodium ion.
The question is, what is the best way to make an aperture? I have sketched and animated in Bongo a traditional camera type aperture, in which multiple blades rotate to open the camera shutter. But there should be a much simpler way.
What I have in mind is a simple Rhino surface, a disk with a tiny hole in the middle. In Bongo, at point 50 on the timeline, I would like to scale up the tiny central hole to the diameter of the full opening of the aperture.
The problem I have encountered is that the scale command does not seem to operate on holes. It seems to scale up a circle instead.
If I ignore Bongo, I find I can pretty easily scale up a hole in a surface using Solidptson and Scale2D. But this doesn’t work in Bongo.
Thank you for your insights on how to do this.