everlaster

Proof of concept: volume compensation via internal pressure

Added 2023-10-26 18:36:43 +0000 UTC

A common concept in soft physics simulation is the compensation of volume loss by expanding the soft physics mesh with an internal pressure force.

I made a very simple breast depth calculation based pressure model as a proof of concept. The video shown has no dynamic morphing at all, the change in shape is purely physics based. In the pressure model, I apply a force on each soft physics joint outward from the center of the breast in proportion to the difference in depth relative to the breast's calibrated depth, times the multiplier slider's value.

I'm a bit shocked at how easy this was to do, and how good the results are. There's a lot of potential here. To develop a fully functioning system that integrates well with the morphing system and the rest of the physics will take time, however.

This throws a wrench into the works when it comes to the planned changes to the morphing system. I need to back to the drawing board - I hope you'll agree that's a good thing! No plan that cannot be revised is a good plan. I will spend some time figuring out how far I can go with the pressure model (and see how it impacts performance), and once it works in multiple directions (rather than just the depth direction), in animations, in different poses etc, it will become clear what the role of dynamic morphing will be and what the main requirements are for improving that system.

Of course, the current morphing system is still very much relevant when not using soft physics, but it's likely that the improvements to the morphing system as well as the morphs themselves will focus on synergy with the pressure model and thus will apply mostly when soft physics is used. That's my current feeling, anyway.

As usual, I'll keep you posted :)