There are few companies who can provide You drawings and visualisation for Your future BMX track. G3D is one of them. All You need to have is topographical plan, idea of what kind and class of track do You want, maybe some wishes for obstacle sequences, and that's all. For affordable amount You'll get back realistic visualisation of track, 3d model, drawings of plan and profiles. Additionally You might want to have fly-through, \"riding arrow\" video, composition of track into real photo or video. All that is also possible.