because my physics system needs to sync with collision system, running my physics task multiple times while collision system runs only once would lead to error.
i tried to add more collisionloop tasks to taskMgr, but i also got Assertion error at line 224.
in fact, what i need from Panda is the collision system runs at higher frequency than graphics. right now it seems using Bullet Physics is the only way.
Bullet Physics is not bad, just that i want to code a physics system on my own.