public void Load(Map map, Camera cam)
{
IntPtr camPtr = BrowserInterop.vtsDrawsCamera(cam.Handle);
Util.CheckInterop();
camera = (CameraBase)Marshal.PtrToStructure(camPtr, typeof(CameraBase));
celestial.Load(map);
IntPtr group = IntPtr.Zero;
uint cnt = 0;
BrowserInterop.vtsDrawsOpaqueGroup(cam.Handle, ref group, ref cnt);
LoadSurfaces(ref opaque, group, cnt);
BrowserInterop.vtsDrawsTransparentGroup(cam.Handle, ref group, ref cnt);
LoadSurfaces(ref transparent, group, cnt);
BrowserInterop.vtsDrawsCollidersGroup(cam.Handle, ref group, ref cnt);
LoadColliders(ref colliders, group, cnt);
}