ReactPhysics3D native extension

d954mas · January 31, 2023, 4:08pm

ReactPhysics3D bindings for defold.
https://www.reactphysics3d.com/

d954mas · January 31, 2023, 3:59pm

VERSION 0.0.1

First version for tests and play:)

-World
-Rigid/CollisionBody
-Collider
-DebugRenderer
-All convex shapes(Box,Capsule,Sphere,ConvexMesh)

d954mas · January 31, 2023, 4:17pm

Test it on windows and web.
Project successfully builds for all platforms.
Ios build and working not tested. Need mac and device.
I hope someone try it on ios:)

SkaterDad · January 31, 2023, 4:21pm

Looks neat!

What benefits would this have over the built in 3D physics? More control?

d954mas · January 31, 2023, 4:33pm

Yes full control:)
-update world by yourself
-create shapes in runtime
-concave meshes(in future)
-you don’t need to add .script to object to get collision_response
-C++ crashes if you do something wrong

anon95708182 · January 31, 2023, 4:43pm

Very cool! Just tested on MacOS - no problems, works just like in the demo!
Edit: I do get some errors in the console, pm you the file.

Dragosha · February 1, 2023, 6:37am

Yeah, that’s one of my favorite flaws with the native physics system.
Please vote up here: https://github.com/defold/defold/issues/7151

mickael-h · February 1, 2023, 1:33pm

Looks great!
Is it compatible with Nvidia PhysX?
Can it be multithreaded?

d954mas · February 1, 2023, 1:56pm

No it don’t support multithreaded. Also from github issues looks like it not thread safety.

I think you can run update in another thread but you need to make sync by your self. Not sure is it realy possible, need tests)

Also html5 build doesn’t support threads, so you will not get any performance boost.

d954mas · February 1, 2023, 2:00pm

About physX, i don’t know)
PhysX is much bigger with a lot of features.

Reactphysics3d is small if compare with physX.

For me reactphysics3d have all that I need in my games, except bullet flag(Continuous collision detection) for bodies

mickael-h · February 1, 2023, 2:10pm

Thanks for the reply.
Yeah I’m mostly on the lookout for multithreaded physics for VR games. The vast majority of them are physics based and monothreading is always a big choke point for performance even though VR is extremely hard on GPUs.

d954mas · March 25, 2023, 6:22pm

Version 0.0.2

1.Add ConcaveMeshShape
2. Add HeightFieldShape
3.Some fixes
4. DOCUMENTATION!!!

MasterMind · March 25, 2023, 10:48pm

This is really nice.

d954mas · April 4, 2023, 6:46pm

Version 0.0.3

1)All joints
-fixed
-slider
-hinge
-ballAndSocket
2)More test scenes

d954mas · April 4, 2023, 6:49pm

Debug render is very slow. I think it because every line is msg.post
Any ideas how to speedup it?

github.com

d954mas/defold-reactphysics3d/blob/f7099ad54dd4d101ae45d306f4ffccea307e8657/reactphysics3d/src/objects/debug_renderer_userdata.cpp#L121

    
      
              RGBUintToVector(color,msg.m_Color);
          }
          
          
static int Reset(lua_State *L){
              DM_LUA_STACK_CHECK(L, 0);
              check_arg_count(L, 1);
              DebugRendererUserdata *userdata = DebugRendererUserdataCheck(L, 1);
              userdata->renderer->reset();
              return 0;
          }
          static int Draw(lua_State *L){
              DM_LUA_STACK_CHECK(L, 0);
              check_arg_count(L, 1);
              DebugRendererUserdata *userdata = DebugRendererUserdataCheck(L, 1);
          
          
    dmGameObject::HInstance instance = dmScript::CheckGOInstance(L);
              dmMessage::URL receiver;
              dmMessage::ResetURL(&receiver);
              dmMessage::Result result = dmMessage::GetSocket(dmRender::RENDER_SOCKET_NAME, &receiver.m_Socket);
              if (result != dmMessage::RESULT_OK){
                  luaL_error(L,"The socket '%s' could not be found.", dmRender::RENDER_SOCKET_NAME);

d954mas · April 4, 2023, 6:50pm

Also you can crash physics engine in Hinge Chain scene:)

britzl · April 4, 2023, 7:28pm

I think we need a new API for this kind of thing. There’s an increasing amount of extensions that have a need to draw debug info at runtime.