Function projectLinesTo3D

Parameters

• ctx: WasmCtx
• params: {
      positions: Float32Array;
      segments: Uint32Array;
      widths: Float32Array;
      colors:
          | Uint8Array<ArrayBufferLike>
          | Float32Array<ArrayBufferLike>
          | Uint16Array<ArrayBufferLike>
          | null;
      sharpness: Float32Array<ArrayBufferLike> | null;
      scalars:
          | Uint8Array<ArrayBufferLike>
          | Float32Array<ArrayBufferLike>
          | Float16Array<ArrayBufferLike>
          | null;
      viewState: ProjectionViewState;
      ndim: number;
      segmentCount: number;
      colorComponents?: 3 | 4;
      emitSourceIndices?: boolean;
  }

  • positions: Float32Array

  • segments: Uint32Array

  • widths: Float32Array

  • colors:
        | Uint8Array<ArrayBufferLike>
        | Float32Array<ArrayBufferLike>
        | Uint16Array<ArrayBufferLike>
        | null

  • sharpness: Float32Array<ArrayBufferLike> | null

  • scalars:
        | Uint8Array<ArrayBufferLike>
        | Float32Array<ArrayBufferLike>
        | Float16Array<ArrayBufferLike>
        | null

    Optional per-vertex scalar attribute for colormap-mode Lines. Accepted dtypes: Float32Array (passes through zero-copy), Float16Array (element-wise expand), Uint8Array (normalized by 1/255 to align with the colormap shader's [0, 1] contract). When null the worker emits empty startScalars/endScalars arrays and the loader leaves the geometry's scalar attribute unallocated.

  • viewState: ProjectionViewState

    View state for projection. Same ProjectionViewState shape every project*To3D worker function accepts — keeps the worker API uniform across node types. All three fields are consumed: the WASM clip_segments_batch step reads slicePosition + tolerance

    • displayDims to decide per-segment visibility and to clip partially-visible segments at the slice boundary.

  • ndim: number

  • segmentCount: number

  • OptionalcolorComponents?: 3 | 4

    Channels per color entry: 3 (RGB, default) or 4 (RGBA — the alpha column is per-vertex opacity, volumetric phase 4). When 4, the worker de-interleaves the coerced colors into an RGB stride-3 array for interpolate_colors_batch (an RGB-only kernel) plus a stride-1 alpha column routed through interpolate_scalars_batch (the widths/sharpness/scalars kernel — alpha interpolates linearly like any scalar), emitting startAlphas/endAlphas.

  • OptionalemitSourceIndices?: boolean

    Record, for every emitted visible slot, which LOADED SEGMENT ROW it came from (sourceSegmentIndices). Opt-in: it costs 4 B per visible segment and only a label-carrying node has a reader (issue #1424), so data-processor-lines.ts sets it exactly when the loader published vertexRangeBounds. Mirrors emitSourceIndices on the gsplats projection.