Interface ProcessedLinesData

Segment start positions in 3D display space (M * 3)

Segment end positions in 3D display space (M * 3)

Start vertex colors RGB (M * 3), interpolated if clipped

End vertex colors RGB (M * 3), interpolated if clipped

Start vertex widths (M,), interpolated if clipped

End vertex widths (M,), interpolated if clipped

Start vertex sharpness (M,), interpolated if clipped

End vertex sharpness (M,), interpolated if clipped

3D segment lengths (M,), used for cap factor calculation

Per-endpoint joint code for the start endpoint (M,): how the line shader should treat it, and — at an ordinary two-segment joint — which segment it joins. 0 free polyline end (keep the soft cap); -1 slice-clipped (suppress the cap; no neighbour will arrive); -2 degree->=3 hub (keep the cap); +(slot + 1) joins visible segment slot at that segment's START; -(slot + 3) joins it at that segment's END.

slot indexes the VISIBLE stream, which is exactly a line-texture storage slot, so it needs no adjustment when the depth-sort worker permutes draw order. Purely topological: the bend angle is measured in screen space by the vertex stage, per frame, so it tracks the camera.

Produced by compute_joint_codes — see wasm/rust/src/lines_clipping.rs for the derivation.

Same for the end endpoint (M,).

Start-vertex scalar values (M,), interpolated if clipped, optional.

present when the source LoadedLinesData.scalars is non-null. Written into texel5.x of the line texture and used by the line vertex shader under USE_COLORMAP (presence rides the userData.hasScalars stamp — the fixed 6-texel layout always has the slot).

End-vertex scalar values (M,), interpolated if clipped, optional. Written into texel5.y.

Start-vertex opacity alphas (M,), interpolated if clipped, optional. Present when the source colors carry an RGBA alpha column (LoadedLinesData.colorComponents === 4); normalized to [0, 1] float regardless of the source color dtype. Written into texel5.z; presence rides the userData.hasElementAlpha stamp (gates only the volumetric w(a) optical-depth map).

End-vertex opacity alphas (M,), interpolated if clipped, optional. Written into texel5.w.

Number of visible segments after clipping

Fused-scan cull metadata from projection (AABB over start+end positions + max finite width — see LinesProjectionBounds). Mirrors the Points metadata.bounds / gsplats bounds pattern: when present, computeLineBounds skips its O(N) per-segment scan; absent (zero visible segments, or a producer that didn't scan) ⇒ scan fallback. Plain scalars so the object survives the worker structured clone.

Slot → ON-DISK element index map for per-element label lookups (M,), composed at projection time by data-processor-lines.ts.

Indexed by the VISIBLE SEGMENT slot the lines pick shader reports (the line-texture texel row); the value is the on-disk sorted VERTEX row of that segment's START vertex, because line labels are per-vertex and their CSR is keyed by that row. A segment has two endpoints and the pick id is a flat vertex-stage varying, so exactly one of them can be reported — see the convention note in data-processor-lines.ts.

Absent ⇒ identity / unavailable: picking falls back to the raw slot. That happens for a node with no label CSR (no vertexRangeBounds published), and whenever the composition inputs were inconsistent (fail closed). The commit stamps it onto the MESH (types/committed-data::setElementIdMap), never onto the loaded payload — that payload may be a SliceCache-owned snapshot.