[ODE] dCollide crashes me app!

[Rob Ruck]

>From what I can work out, its tri-meshes crashing for you, and none of the 
other primitives. The callback looks fine at a glance, and so does the snippet 
of tri-mesh setup code, but.... From the look of it, you new the indices/vert 
data locally, and I imagine, you probably delete it too. The tri-mesh stuff 
doesn't make a copy of this data, you need to alloc it and leave it alloc'd until 
you're finished, and then delete it yourself.

On 27 Feb 2004 at 0:37, Fabian Mathews wrote:

> i have a trimesh and a cube, and it crashes in the dCollide line in my code 
> when they intersect.
> 
> I have tried a plane and a cube, and it works fine, so im not sure if its my 
> callback function, or if its my trimesh settup code?
> 
> any ideas are appreciated!
> thanks from fab,
> 
> any way, here is both:
> 
> 
> callback:
> -------------------------------------------
> #define MAX_CONTACTS 40
> 
> void PhysicsMgr::NearCollisionCallback(void *data, dGeomID o1, dGeomID o2)
> {
> int i;
> //   if (o1->body && o2->body) return;
> 
>   // exit without doing anything if the two bodies are connected by a joint
>   dBodyID b1 = dGeomGetBody(o1);
>   dBodyID b2 = dGeomGetBody(o2);
>   if (b1 && b2 && dAreConnectedExcluding (b1,b2,dJointTypeContact)) return;
> 
>   dContact contact[MAX_CONTACTS];   // up to MAX_CONTACTS contacts per 
> box-box
>   for (i=0; i<MAX_CONTACTS; i++)
>   {
>     contact[i].surface.mode = dContactBounce | dContactSoftCFM;
>     contact[i].surface.mu = dInfinity;
>     contact[i].surface.mu2 = 0;
>     contact[i].surface.bounce = 0.1;
>     contact[i].surface.bounce_vel = 0.1;
>     contact[i].surface.soft_cfm = 0.01;
>   }
>   printf("hello?\n");
> 
>   int numc=dCollide(o1,o2,MAX_CONTACTS,&contact[0].geom,sizeof(dContact));
> 
>   printf("hello? 2\n");
> 
>   if(numc>0)
>   {
>     for(i=0;i<numc;i++)
> 	{
>       dJointID c = dJointCreateContact(world,contactgroup,&contact[i]);
>       dJointAttach(c,b1,b2);
>     }
>   }
> -------------------------------------------
> trimesh setup:
> -------------------------------------------
> 	printf("Building collision mesh!\n");
> 	meshData = dGeomTriMeshDataCreate();
> 
> 	dVector3* newVerts = new dVector3[noVertices];
> 	int* newIdxs = new int[noIndices];
> 
> 	for( int i = 0; i < noIndices; ++i )
> 	{
> 		newIdxs[i] = indices[i];
> 	}
> 
> 	for( int v = 0; v < noIndices; ++v )
> 	{
> 		newVerts[v][0]= positions[v][0];
> 		newVerts[v][1]= positions[v][1];
> 		newVerts[v][2]= positions[v][2];
> 	}
> 
> 	dGeomTriMeshDataBuildSimple( meshData, (dReal*)newVerts, noVertices,
> 			    newIdxs, noIndices );
> 
> 	geom = dCreateTriMesh( PhysicsMgr::GetInstance().GetSpace(), meshData, 0, 
> 0, 0 );
> ---------------------------------------------
> 
> 
> 
> -------------------------------
> Fabian "SupaGu" Mathews
> 
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--
Rob Ruck
mailto:bobruck at btinternet.com