BEPUphysics.DataStructures.TriangleMesh.AddMesh C# (CSharp) Метод

        public static void AddMesh(ModelMesh collisionModelMesh, Matrix transform, List<Vector3> vertices, IList<int> indices)
        {
            foreach (ModelMeshPart meshPart in collisionModelMesh.MeshParts)
            {
                int startIndex = vertices.Count;
                var meshPartVertices = new Vector3[meshPart.NumVertices];
                //Grab position data from the mesh part.
                int stride = meshPart.VertexBuffer.VertexDeclaration.VertexStride;
                meshPart.VertexBuffer.GetData(
                        meshPart.VertexOffset * stride,
                        meshPartVertices,
                        0,
                        meshPart.NumVertices,
                        stride);

                //Transform it so its vertices are located in the model's space as opposed to mesh part space.
                Vector3.Transform(meshPartVertices, ref transform, meshPartVertices);
                vertices.AddRange(meshPartVertices);

                if (meshPart.IndexBuffer.IndexElementSize == IndexElementSize.ThirtyTwoBits)
                {
                    var meshIndices = new int[meshPart.PrimitiveCount * 3];
                    meshPart.IndexBuffer.GetData(meshPart.StartIndex * 4, meshIndices, 0, meshPart.PrimitiveCount * 3);
                    for (int k = 0; k < meshIndices.Length; k++)
                    {
                        indices.Add(startIndex + meshIndices[k]);
                    }
                }
                else
                {
                    var meshIndices = new ushort[meshPart.PrimitiveCount * 3];
                    meshPart.IndexBuffer.GetData(meshPart.StartIndex * 2, meshIndices, 0, meshPart.PrimitiveCount * 3);
                    for (int k = 0; k < meshIndices.Length; k++)
                    {
                        indices.Add(startIndex + meshIndices[k]);
                    }


                }
            }




        }