Build the four per-type handler ctx objects from a shared input. Returns them as { pointsCtx, linesCtx, gsplatsCtx, meshCtx }.
{ pointsCtx, linesCtx, gsplatsCtx, meshCtx }
Build the four per-type handler ctx objects from a shared input. Returns them as
{ pointsCtx, linesCtx, gsplatsCtx, meshCtx }.