Construct the canonical "no visible splats at this slice" payload. Mirrors createEmptyPointsData in points/projection.ts and createEmptyLinesData in lines/projection.ts.
createEmptyPointsData
points/projection.ts
createEmptyLinesData
lines/projection.ts
Construct the canonical "no visible splats at this slice" payload. Mirrors
createEmptyPointsDatainpoints/projection.tsandcreateEmptyLinesDatainlines/projection.ts.