XNA 3d how get models primitives

[Superposed_Cat]

Hi ll, I am currently working on 3d in xna. i have ismple collision detcetion working but I want to do triangle by triangle collision detection.How would I get a models base triangles?

I have this adapted from online to fit in with my game:

 public struct TriangleVertex
        {
            public VertexPositionNormalTexture I0;
            public VertexPositionNormalTexture I1;
            public VertexPositionNormalTexture I2;
        } 

public static List<TriangleVertex> GetModelsPrimitives(Entity E)
        {//all models passed though here MUST be UV mapped
            Matrix theMatrix = E.GetWorldModel();
            List<TriangleVertex> h = new List<TriangleVertex>();
            foreach (ModelMesh mesh in Game1.Models[E.ModelKey].Meshes)
            {
                foreach (ModelMeshPart part in mesh.MeshParts)
                {
                    VertexPositionNormalTexture[] vertices = new VertexPositionNormalTexture[part.VertexBuffer.VertexCount];
                    part.VertexBuffer.GetData<VertexPositionNormalTexture>(vertices);

                    ushort[] drawOrder = new ushort[part.IndexBuffer.IndexCount];
                    part.IndexBuffer.GetData<ushort>(drawOrder);

                    VertexPositionNormalTexture[] vertices2 = new VertexPositionNormalTexture[drawOrder.Length];
                    for (int i = 0; i < drawOrder.Length; i++)
                    {//sort vertices2 according to draw order
                        vertices2[i] = vertices[drawOrder[i]];
                    }

                    for (int i = 0; i < vertices2.Length; i += 3)
                    {//group it into triangles
                        TriangleVertex tv = new TriangleVertex();
                        tv.I0.Position = Vector3.Transform(vertices2[i].Position, theMatrix);
                        tv.I1.Position = Vector3.Transform(vertices2[i + 1].Position, theMatrix);
                        tv.I2.Position = Vector3.Transform(vertices2[i + 2].Position, theMatrix);
                        h.Add(tv);
                    }
                }
            }
            return h;
        }

but i get an "The array is not the correct size for the amount of data requested" error. any help apreciated.

 

[Greg Bernhardt]

I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?

 

[Superposed_Cat]

it's fien found my issue. i needed forgot to UV map the model. apologies. stupid non-code related error.