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• LeshaVH
  
  Community Member
  2 posts

  Can not create NxTriangleMesh

  28 June 2008 at 4:15pm

  Here is sample code that threw access viloation exception. Could u please point to problem?

   
       Vector3[] vertices = new Vector3[3];
        vertices[0] = Vector3.Zero;
        vertices[1] = Vector3.UnitX;
        vertices[2] = Vector3.UnitY;
   
        int[] indices = new int[3];
        indices[0] = 0;
        indices[1] = 1;
        indices[2] = 2;
   
        NxTriangleMeshDesc meshDesc = new NxTriangleMeshDesc();
   
        // unsafe part
        unsafe
        {
          fixed (int* pIndices = indices)
          {
            meshDesc.triangles = new IntPtr((void*)pIndices);
          }
   
          fixed (Vector3* pVertices = vertices)
          {
            meshDesc.points = new IntPtr((void*)pVertices);
          }
   
          meshDesc.pointStrideBytes = (uint)sizeof(Vector3);
        }
   
        meshDesc.numVertices = (uint)vertices.Length;
        meshDesc.numTriangles = (uint)indices.Length / 3;
        meshDesc.triangleStrideBytes = 3 * sizeof(int);
        meshDesc.flags = 0;
        meshDesc.heightFieldVerticalAxis = NxHeightFieldAxis.NX_Z;
        meshDesc.heightFieldVerticalExtent = -1000.0f;
   
        NxCookingInterface cooking = PhysXLoader.NxGetCookingLib(PhysXLoader.NX_PHYSICS_SDK_VERSION);
        NxStream stream = new NxStream();
        bool cooked = cooking.NxCookTriangleMesh(meshDesc, stream);
   
        NxTriangleMesh mesh = sdk.createTriangleMesh(stream);
   
        cooking.Dispose();
        cooking = null;
   
        meshDesc.Dispose();
        meshDesc = null;
   

  Last edited: 18 July 2008 at 10:37pm

• SeaEagle1
  
  Administrator
  16 posts

  Re: Can not create NxTriangleMesh

  18 July 2008 at 10:44pm

  I can't tell exactly what your problem is, but one of them is that you assign pointers in the meshDesc in the fixed{ } part, but immediatly 'free' them by leaving fixed{ } while PhysX will use those pointers when you call NxCookTriangleMesh(). So it should be something like
  

   
         // create stream
         NxStream stream = new NxStream();
   
  // go unsafe
  unsafe
        {
          // fix pointers
          fixed (int* pIndices = indices)
          fixed (Vector3* pVertices = vertices)
          {
            // assign pointers
            meshDesc.triangles = new IntPtr((void*)pIndices);
            meshDesc.points = new IntPtr((void*)pVertices);
   
            meshDesc.pointStrideBytes = (uint)sizeof(Vector3);
   
            meshDesc.numVertices = (uint)vertices.Length;
            meshDesc.numTriangles = (uint)indices.Length / 3;
            meshDesc.triangleStrideBytes = 3 * sizeof(int);
            meshDesc.flags = 0;
            meshDesc.heightFieldVerticalAxis = NxHeightFieldAxis.NX_Z;
            meshDesc.heightFieldVerticalExtent = -1000.0f;
   
            // create mesh
            NxCookingInterface cooking = PhysXLoader.NxGetCookingLib(PhysXLoader.NX_PHYSICS_SDK_VERSION);
            bool cooked = cooking.NxCookTriangleMesh(meshDesc, stream);
         }
       }
   
        NxTriangleMesh mesh = sdk.createTriangleMesh(stream);
   

  Last edited: 18 July 2008 at 10:47pm

• LeshaVH
  
  Community Member
  2 posts

  Re: Can not create NxTriangleMesh

  21 July 2008 at 2:03pm

  Thanks for reply!

  However your code does not work too...
  I try to check and figure out that NxCookTriangleMesh() does not write to stream anything....

  As I check it in C++ all is fine (stream must containt about 300 bytes for 2 trianlges), except at least 2 triangles should be passed to NxCookTriangleMesh()...

  Could u please check it in С#?