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• CyberVillain
  
  Community Member
  2 posts

  Correct way of setting arrays for triangle mesh

  31 January 2009 at 12:58pm

  Hi.
  I've written a parser for .x directx files that will create a NxVec3 array of vertices and a uint32 array size of (x, 3) of indicies.

  But the properties only takes pointers, whats the correct way of settings these two properties?

  Best Regards, Anders

• CyberVillain
  
  Community Member
  2 posts

  Re: Correct way of setting arrays for triangle mesh

  31 January 2009 at 3:21pm

  This is my code, coocked returns false, and it crashes on last line

   
  NxTriangleMesh mesh = sdk.createTriangleMesh(stream);
   
          private NxActor CreateActorFromFile(string filename)
          {
              MeshManager meshManager = new MeshManager();
              NxActor actor = null;
              NxVec3[] vertices;
              int[,] indices;
   
              meshManager.GetMesh(filename, out vertices, out indices);
   
              // create stream
              NxStream stream = new NxStream();
              NxTriangleMeshDesc meshDesc = new NxTriangleMeshDesc();
              // go unsafe
              unsafe
              {
                  // fix pointers
                  fixed (int* pIndices = indices)
                  fixed (NxVec3* pVertices = vertices)
                  {
                      // assign pointers
                      meshDesc.triangles = new IntPtr((void*)pIndices);
                      meshDesc.points = new IntPtr((void*)pVertices);
   
                      meshDesc.pointStrideBytes = (uint)sizeof(NxVec3);
   
                      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);
   
   
   
              return actor;
          }
   

  Last edited: 1 February 2009 at 9:21pm

• SeaEagle1
  
  Administrator
  16 posts

  Re: Correct way of setting arrays for triangle mesh

  1 February 2009 at 9:38pm

  I haven't done much with mesh cooking myself so far, but a few things I can come up with are:
  

  • Do you initialise the cooking sdk?
    
  • What does meshDesc.isValid() return?
    
  • NxStream is, afaik, just an abstract class which need an implementation.
    

  Last edited: 1 February 2009 at 9:39pm