vircadia
Fix flow not working without gravity C++Flow
When trying to use the "flow" system to make stuff floppy, the bones just kind of fly around wildly rather than staying in their origin position when no gravity force is applied. An example is this avatar: http://94.130.177.235/Effole22Cpp/Effole22.fst Here is a video of the problem: http://94.130.177.235/Effole22Cpp/cppflow.webm Playing around with the settings, there is no workaround. This also happens on the old javascript flow.
Here is an example of how it should behave without gravity: http://94.130.177.235/Effole22Cpp/cppflow_vrc.webm Obviously always depending on the values for stiffness, etc.
David is investigating the C++ flow integration in general and will report back with findings of feasibility.
It looks like the C++ flow code is in generally good shape and it should be feasible to fix for such a bounty. I can take this on.
I'm pausing work on this for the moment. While the code in general seems OK there are some inexplicable bits and I've not been able to work solve the problem so far. The rotation of the first joint in zero g seems especially problematic.
Note: Kalila has to reload her avatar on launch in order to not have her hair hover around.
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Note: The old, pre-C++ implementation of flow in JavaScript reportedly worked well. https://hifi-content.s3.amazonaws.com/jimi/avatar/Niconico/Jene_5/scripts/jene_Flow.js
See, also: https://github.com/vircadia/vircadia/issues/74