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[SlimDX] Optimize mesh


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#1 jor1980   Members   -  Reputation: 142

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Posted 20 March 2013 - 04:55 PM

Hi, i am trying to optimize my mesh with this code, but i don´t know why i have an access violation exception whe i call mesh.GenerateAdjacency,

i don´t know if this error is because the flags used creating the mesh or the flags creating my device or i don´t know, Anyone could guide me?

 

SlimDX.Direct3D9.Direct3D myDirect3D= new SlimDX.Direct3D9.Direct3D();
            SlimDX.Direct3D9.PresentParameters myPresentParamters= new SlimDX.Direct3D9.PresentParameters();
            myPresentParamters.Windowed=true;
            myPresentParamters.SwapEffect=SlimDX.Direct3D9.SwapEffect.Discard;
            SlimDX.Direct3D9.Device myDevice= new SlimDX.Direct3D9.Device(myDirect3D,0,SlimDX.Direct3D9.DeviceType.Hardware,this.Handle,SlimDX.Direct3D9.CreateFlags.SoftwareVertexProcessing,myPresentParamters);
            
            int faceCount=triangleList.Count;
            int vertexCount=vertexList.Count;
            SlimDX.Direct3D9.Mesh myMesh = new SlimDX.Direct3D9.Mesh(myDevice, faceCount, vertexCount, SlimDX.Direct3D9.MeshFlags.SystemMemory, SlimDX.Direct3D9.VertexFormat.Position);

            SlimDX.DataStream indexBuffer = myMesh.LockIndexBuffer(SlimDX.Direct3D9.LockFlags.None);
            SlimDX.DataStream vertexBuffer = myMesh.LockVertexBuffer(SlimDX.Direct3D9.LockFlags.None);

            for (int i = 0; i < myMesh.VertexCount; i++)
            {
                vertexBuffer.Write<SlimDX.Vector3>(vertexList[i]);
               
            }


            for (int i = 0; i < myMesh.FaceCount; i++)
            {
                ushort index;
                index = (ushort)triangleList[i].X;
                indexBuffer.Write<ushort>(index);

                index = (ushort)triangleList[i].Y;
                indexBuffer.Write<ushort>(index);

                index = (ushort)triangleList[i].Z;
                indexBuffer.Write<ushort>(index);
            }

            
            myMesh.GenerateAdjacency(0.5f);
            SlimDX.Direct3D9.Mesh meshOptimizada = myMesh.Optimize(SlimDX.Direct3D9.MeshOptimizeFlags.StripReorder);

 

 



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#2 Postie   Members   -  Reputation: 882

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Posted 21 March 2013 - 07:25 PM

I've seen access violations like this occur when the index buffer contains data that is out of the range of your vertices. Since you haven't unlocked your buffers after writing data to them, I'm guessing the data hasn't actually been committed yet. You'll need to call Unlock() on both of your buffers before you call any of those other functions.

 

Also, if your vertex and index buffer formats match the data in your lists, you should be able to use vertexBuffer.WriteRange(vertexList) and indexbuffer.WriteRange(trianglelist) instead of having to do each item individually in a loop.

 

Finally, its good practise to test your return values, rather than just blindly use the result that's passed back.


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