12-03-2018, 03:39 PM
(This post was last modified: 12-03-2018, 03:41 PM by josemendez.)
(12-03-2018, 02:45 PM)IanTc Wrote: Hello, no reply from anyone?
Are these difficult questions to answer? Or... Is it because I am not a customer yet?
I don't want to assume misdeed here, but is it also the reason my account has been deleted, even though I had validated it? (I had to recreate it and I could use the same same email address and username, meaning none of them were registered on the forum.)
Hi Ian,
I'm not aware that your account had been deleted, we've been having lots of issues with spammers recently and have set up some automatic scripts to deal with them. They might have incorrectly flagged your account, so please accept my apologies.
Regarding your questions:
1) Yes, when we talk about 2D mode we are referring to Physics2D colliders/rigidbodies. All non-fluid physics is handled by Unity, Obi interfaces with 2D and 3D rigidbodies via impulse exchange.
2) Buoyancy computation has zero cost. It emerges automatically due to the fact that fluid particles have a certain mass, as well as rigidbodies do. Depending on the fluid/collider density ratio, things float or sink. No extra work is done by the engine to make this happen.
3) In 2D space, only edge emitters are actually useful. You could use Sphere or Disk emitters (all emitters can be rotated in 3D space) but particles emitted in different z coordinates have no effect in 2D. Only X and Y coordinates are used for simulation.
4) Obi is fully multithreaded using a job-stealing thread pool. Moreover, math intensive sections are written using SSE/AVX intrinsics. The main thread spawns tasks, then waits for the worker threads to finish their work. However keep in mind that this doesn't mean physics and rendering can happen concurrently, Unity's update cycle must still be respected: FixedUpdate()->Update()->Rendering.