Trimesh: Problem with btTriangleShape

[spy32]

Hi Bullet Users and Helpers,
i want to use trimeshes for levels/rooms in my game, but when I try to implement something like this I get stuck. First of all, which trimesh type is for levels/rooms recommended by you? I tried to use "btTriangleMeshShape" but that's impossible for me , because of this little error:
(Here's my code)

Code: Select all

    void Trimesh::create(std::string modelfile, float mass, Vector3D scale)
    {


        trimesh = new btTriangleMesh();

        // Load the mesh with Irrlicht
        std::string filename = FileSystem::get()->getFileExists(std::string("models/") + modelfile);
        irr::scene::IAnimatedMesh *animmesh = GraphicsEngine::get()->getSceneManager()->getMesh(filename.c_str());
        irr::scene::IMesh *mesh  = animmesh->getMesh(0);

        // Test whether the mesh has got one mesh buffer. (Multiple meshbuffers aren't supported yet)
        if (mesh->getMeshBufferCount())
        {
            irr::scene::IMeshBuffer *buffer = mesh->getMeshBuffer(0);
            LDEBUG("Number of meshbuffers: %d\n", mesh->getMeshBufferCount());



            int tricount = buffer->getVertexCount() / 3;
            unsigned short int *indices = new unsigned short int[buffer->getIndexCount()];
            indices = buffer->getIndices();
            LDEBUG("Got all indices...\n");

            irr::video::S3DVertex *vecdata = (irr::video::S3DVertex*)buffer->getVertices();
            float *vertices = new float[buffer->getVertexCount() * 3];
            for(int j = 0; j < buffer->getVertexCount(); j++)
            {
                vertices[j] = vecdata[j].Pos.X;
                vertices[j+1] = vecdata[j].Pos.Y;
                vertices[j+2] = vecdata[j].Pos.Z;
            }
            LDEBUG("Got all vertices...\n");

            int index0, index1, index2;
            btVector3 vertex0, vertex1, vertex2;
            for(int i = 0; i < tricount; i++)
            {
                index0 = indices[i*3];
                index1 = indices[i*3+1];
                index2 = indices[i*3+2];

                btVector3 vertex0(vertices[index0*3], vertices[index0*3+1], vertices[index0*3+2]);
                btVector3 vertex1(vertices[index1*3], vertices[index1*3+1], vertices[index1*3+2]);
                btVector3 vertex2(vertices[index2*3], vertices[index2*3+1], vertices[index2*3+2]);

                trimesh->addTriangle(vertex0,vertex1,vertex2);
            }
            LDEBUG("Overgived mesh to bullet...\n");

            delete indices;
            delete vertices;

            /*btConvexShape *tmpshape = new btConvexTriangleMeshShape(trimesh);
            btShapeHull *hull = new btShapeHull(tmpshape);
            btScalar margin = tmpshape->getMargin();
            hull->buildHull(margin);
            tmpshape->setUserPointer(hull);

            shape = new btConvexHullShape();
            btConvexHullShape *convexshape = (btConvexHullShape*)(shape);
            for (int k = 0; k < hull->numVertices() ; k++)
            {
                convexshape->addPoint(btPoint3(hull->getVertexPointer()[k]));
            }

            delete tmpshape;
            delete hull;*/

            shape = (btCollisionShape*)(new btTriangleMeshShape(trimesh));
            LDEBUG("Sucessfully generated trimesh shape (or only without runtime error)\n");
        }

(just ignore the commented code)

I get the following error(s):

F:\Entwicklung\peakengine\branches\entity-rewrite\engine\src\physics\Trimesh.cpp||In member function `void peak::Trimesh::create(std::string, float, peak::Vector3D)':|
F:\Entwicklung\peakengine\branches\entity-rewrite\engine\src\physics\Trimesh.cpp|95|error: cannot allocate an object of type `btTriangleMeshShape'|
F:\Entwicklung\peakengine\branches\entity-rewrite\engine\src\physics\Trimesh.cpp|95|error: because the following virtual functions are abstract:|
include\bullet\BulletCollision\CollisionShapes\btCollisionShape.h|79|error: virtual int btCollisionShape::getShapeType() const|

You See: I am using Irrlicht to load the mesh files. When I am using the commented code, my objects just fall through the trimesh level. How can I use a standard btTriangleMeshShape

(I didn't find anything with the forum search :-[ )

Thank You,
Chris

[Erwin Coumans]

Please use btBvhTriangleMeshShape instead, that should work. See ConcaveDemo for details.

Hope this helps,
Erwin

[spy32]

Please use btBvhTriangleMeshShape instead, that should work. See ConcaveDemo for details.

Hope this helps,
Erwin

Thank You Erwin my trimesh physics are now working very good. For moveable objects i am using btConvexHullShape and for static objects i am using btBvhTriangleMeshShape

Best Regards,
spy32