Hi first of all i want to apollogize because i did this question before on the wrong forum.

My problem is the next, i am creating a mesh with vertex and faceslist, then i call to compute normals and i get an access violation exception, you are trying to read or write in protected memory, i don´t know how to solve it.

the error is send in this line : cloneMesh.ComputeNormals();

This is my code:

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.Managed, SlimDX.Direct3D9.VertexFormat.Position|SlimDX.Direct3D9.VertexFormat.Texture1|SlimDX.Direct3D9.VertexFormat.Normal);

            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);
                vertexBuffer.Write<SlimDX.Vector2>(uvListFifa13);
                vertexBuffer.Seek(12, SeekOrigin.Current);
            }


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

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

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

            SlimDX.Direct3D9.Mesh cloneMesh = myMesh.Clone(myDevice, SlimDX.Direct3D9.MeshFlags.Dynamic, SlimDX.Direct3D9.VertexFormat.Position|SlimDX.Direct3D9.VertexFormat.Normal|SlimDX.Direct3D9.VertexFormat.Texture1);
            cloneMesh.ComputeNormals();
            cloneMesh.GenerateAdjacency(0.5f);
            SlimDX.Direct3D9.Mesh meshOptimizada = myMesh.Optimize(SlimDX.Direct3D9.MeshOptimizeFlags.StripReorder);

include your code for ComputeNormals() you might be tring to access a value past the size of an array, which would be incorrect RAM management

Hi, i have unlocked now the vertex and index buffer and i still have the same access violation, Do you have any other clue about this?

Here is my actual code:

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.Managed, SlimDX.Direct3D9.VertexFormat.Position|SlimDX.Direct3D9.VertexFormat.Texture1|SlimDX.Direct3D9.VertexFormat.Normal);

            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);
                vertexBuffer.Write<SlimDX.Vector2>(uvListFifa13);
                vertexBuffer.Seek(12, SeekOrigin.Current);
            }


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

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

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

            myMesh.UnlockVertexBuffer();
            myMesh.UnlockIndexBuffer();

            SlimDX.Direct3D9.Mesh cloneMesh = myMesh.Clone(myDevice, SlimDX.Direct3D9.MeshFlags.Dynamic, SlimDX.Direct3D9.VertexFormat.Position|SlimDX.Direct3D9.VertexFormat.Normal|SlimDX.Direct3D9.VertexFormat.Texture1);
            
            cloneMesh.GenerateAdjacency(0.5f);
            cloneMesh.ComputeNormals();
            
            SlimDX.Direct3D9.Mesh meshOptimizada = myMesh.Optimize(SlimDX.Direct3D9.MeshOptimizeFlags.StripReorder);

Now is solved, the problem was at mi index buffer it had wrog data