NDC Sorting Incorrect

Using the new NDC BP nodes in 5.7 causes sorting to break; one system, regardless of world placement, is always drawn over the other. Even when the viewpoint puts the dominant system in the foreground, the background system will flicker through and occasionally be visible. This makes these visually unacceptable for shipping.

There is also a potentially related performance drop from sorting.

The sorting works fine with other Niagara Components, and only breaks with NDC.

Using the legacy “Write to Niagara Data Channel” BP node causes sorting to work correctly.

1. Open repro project (5.7).
2. PIE.
3. Observe sorting issues with the two NDCs.