Hi JanSidgwick,
Soap-bubbles are quite complex. I have explored the base of it a little bit here:
https://www.cineversity.com/forums/viewthread/2615/
However, since things move forward, and clever people have great ideas, like this example shows:
https://www.youtube.com/watch?v=Tx795suYWCA
I was able to set file _…21.c4d up based on it. Except for the scale, anything needed to know is in the YouTube clip.
The file _…11.c4d is a different approach and much simpler. It uses the position of each “bubble”, stored in a Tracer-Spline, as the source. However, file #11 works only with equally sized spheres!
https://www.amazon.com/clouddrive/share/acJF0IWJDIE23qymqeS32z61LXaqxA4w6LrPaLbe95T
Thinfilm Shader Quick Tip:
https://www.youtube.com/watch?v=FxjROrq8U4w
I hope that helps.
Cheers