[ODE] Trimesh collision problem

[Jürgen Ladstätter]

Hi again,

i changed some things in my code, e.g. triangle amount (1 triangle, but
value 3 to pass to the function). Still no collision

	dVector3 dVertex[3];
	int   iPoly[3];
		
		// 1st Vertexpoint coordinates
		dVertex[0][0] = 0;
		dVertex[0][1] = 297;
		dVertex[0][2] = 800;
		// 2nd Vertexpoint coordinates
		dVertex[1][0] = 297;
		dVertex[1][1] = 297;
		dVertex[1][2] = 800;
		// 3rd Vertexpoint coordinates
		dVertex[2][0] = 297;
		dVertex[2][1] = 0;
		dVertex[2][2] = 800;

		// Polygon combo
		iPoly[0] = 0;
		iPoly[1] = 1;
		iPoly[2] = 2;

		dTriMeshDataID idTrimeshData = dGeomTriMeshDataCreate();
		dGeomTriMeshDataBuildSimple( idTrimeshData, (dReal*)dVertex,
3, iPoly, 3);
		dGeomID idTrimesh = dCreateTriMesh( g_ikCDSpace,
idTrimeshData, 0, 0, 0 );
		dGeomID ray = dCreateRay( g_ikCDSpace, 40 );
		dGeomRaySet( ray, 280, 280, 780, 280, 280, 820 );

		dContactGeom contact;
		int asd = dCollide( ray, idTrimesh, 0, &contact, 

		dGeomTriMeshDataDestroy(idTrimeshData);
	}

Int asd = ... is always 0 :(

-----Ursprüngliche Nachricht-----
Von: ode-bounces at ode.org [mailto:ode-bounces at ode.org] Im Auftrag von Jürgen
Ladstätter
Gesendet: Dienstag, 20. März 2007 14:44
An: ode at ode.org
Betreff: Re: [ODE] Trimesh collision problem

Hi dave,

thanks for your help, but it still doesnt work. Maybe that’s because I use
ODE 0.7 binary release?

Btw neither in the WIKI nor in the official docu I found
dGeomTriMeshDataBuildSingle or %Single1 - where did ya find them?

An other question: vertexpoints should be 4*dReal, how can you pass a
pointer to your HsVector array? HsVector is a struct of 3 floats as you said
- not 4 floats,

Kind regards,

-----Ursprüngliche Nachricht-----
Von: David Walters [mailto:hidden.asbestos at googlemail.com] 
Gesendet: Dienstag, 20. März 2007 14:28
An: Jürgen Ladstätter
Cc: ode at ode.org
Betreff: Re: [ODE] Trimesh collision problem

> Everything else seems like it should work

Actually no, I think I've spotted the problem -
dGeomTriMeshDataBuildSimple takes dVertex data which is actually an
array of quad-floats, rather than three.

If you see what dGeomTriMeshDataBuildSimple resolves to, it'll make more
sense:

    dGeomTriMeshDataBuildSingle1(g,
				Vertices, 4 * sizeof(dReal), VertexCount,
				Indices, IndexCount, 3 * sizeof(unsigned
int),
				Normals);

I use:

	dGeomTriMeshDataBuildSingle( g, p_vertex_data, sizeof( HsVector ),
		vertex_count, p_index_data, triangle_count * 3, sizeof(
UINT32 ) * 3 );

Where HsVector is a struct of 3 floats

Hope that helps!

Regards,
Dave


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