I'm experimenting with voronoi dynamic fracturing at the moment and I'm getting some strange behaviour in my simulation which I'm sure you can help me fix.
My testsetup is simple. A Utha Teapot falling to the ground, shattering on impact (allowing 2 shatter steps). You can download and watch my test-video to get a better impression on what I'm talking about next:
My Hip-file is attached to this post aswell.
Afte the majority of the (bigger) shattered pieces come to a rest, some small pieces still keep moving like there is no friction or dampening or anything (but of course there is). They just keep spinning on the ground, or sliding on the ground with no counterforce to bring them to a halt. What is causing this strange behaviour? Can I somehow add a global dampening to the simulation to bring everything to a rest?
When I allow multiple shatter steps (eg. that a big piece can shatter again once more it hits the ground), it looks like a explosion rather than shattering. Meaning it seams as if the parts are getting new energy after shattering, flying up in the air when hitting the ground again, which looks as said like little explosions rather than just shattering.
I'm not sure which setting causes this behaviour. I guess its related to the velocity transfere settings, but I dont understand how to set them correctly. Any hints here?
I know RBD simulations have to be modeld in real life size in order to be simulated "physically correct". But when setting the grid unit to 1 unit = 1m, and 1unit = 1kg mass, and modeling e.g a teapot with a radius of 0.15 which would be a teapot of 30cm in with, it won't shatter when hitting the ground (falling from 1m above the ground). This happens independently from the min/max impact settings. Even setting min impact to 0 still gives me no shattering. The simulation just does not pic up the impact. When I increas its size of the teapot to radius 1m in size (=1unit), it shatters correctly. I solved the problem by setting the scene to 1 unit = 1 decimeter, and 1 unit = 100g mass, but I would rather like to work with meters and kg since it is easier to set up all the physical parameters like density and stuff because they are always given in kg/m^3 and so on. Can you explain this strange behaviour?
Furthermore, if you find anything else I might do wrong or if you have any suggestions for better (sim-)settings, please do not hesitate to tell me. I'm very happy/eager to learn and improve!
Thx in advance for your time, help and tips!
Looking forward to your answers!