For some reason when i create a phys object from my own mesh I wont get any physics. I mean there's no gravity or anything. The phys object is there but just wont fall when dropped.
Same object with automatic phys object works ok.

Non convex meshes can't be dynamic in physx.

omg.. thats just lame!

Agreed...so how does one do physics with convex meshes? Is this an outright limitation or are there workarounds?

i saw something about attaching physics objects somewhere..
that might the workaround.

hmm.. i could swear i used mesh based physics objects in unity which is also physx.

what I have done in my project is create a physical object about the same size of the bounding box and than using actor's matrix to build up static (or animated in my case) mesh around it:
- in init create physics;
- in init create a containing actor from a capsule or something that wraps up your mesh;
- in update get sim physics (if world is not present otherwise world.update will do);
- in update use actor.matrix().pos to set up mesh pos;
this way simulations are done on a simpler object but you get the results on your mesh indirectly. Obviously if you want to move your mesh you have to move the actor (you can use controller instead of actor)

Yes, this is certainly a viable workaround, but that means we basically can't do physics with complicated shapes?

yes you can.. just build with mesh editor a complex physical group, save it to file (.phys) then load it in the game using the physgroup object.. there's a really nice tutorial (actor from mesh) and nice explanation on how to build up the physical group in mesh editor in the documentation ^^

this way it will have gravity and all?

physx doesn't support dynamic Mesh based actors (its not efficient)
only convex, or shaped based (can be many shapes) can be dynamic

i was wondering.. how to create a braking object.
if i have saved object in world with different parts.
how do i seperate the parts and create items from them? or something with physics.

i got about this far

best thing would be to create new objects from all the parts and create convex hulls from them.

yes, that's good idea to create separate objects

I would set a class let's say OBJ_DEBRIS (Debris : Game::Obj) just for the destroyed stuff.

I will be implementing automatic objects destroying in the future.

the thing that got me here that i couldnt do was that i dont know how to seperate mesh parts to objects?


the assigning a part of a another mesh to a basemesh of an object thing..

could you give some example code for this?

if id have an obj class called depris.

that has some cube for a phys file. how do i assign one part of another mesh to that objects mesh..
hard to explain

yeah i have now got this working just by creating a one fragment peace and saved that as an obj. when the object brakes it spawns few of the framents and a broken main part of the object.

not exactly what i was looking for but it will have to do now since i didn't manage to break mesh parts into objects.

in a newly created debris objects you can store:

struct Debris
{
Mesh *mesh;
Int part_index;