Function projectGSplatsTo3D

Parameters

• ctx: WasmCtx
• params: {
      positions: Float32Array;
      choleskyFactors: Float32Array;
      amplitudes: Float32Array;
      colors:
          | Uint8Array<ArrayBufferLike>
          | Float32Array<ArrayBufferLike>
          | Uint16Array<ArrayBufferLike>
          | null;
      sharpness: Float32Array<ArrayBufferLike> | null;
      viewState: ProjectionViewState;
      ndim: number;
      splatCount: number;
      discreteDims?: readonly number[];
      discreteSteps?: Record<number, number>;
      extendToAllDims?: readonly number[];
      truncate?: number;
      colorComponents?: 3 | 4;
      emitSourceIndices?: boolean;
  }

  • positions: Float32Array

  • choleskyFactors: Float32Array

  • amplitudes: Float32Array

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

  • sharpness: Float32Array<ArrayBufferLike> | null

  • viewState: ProjectionViewState

    View state for projection. Same ProjectionViewState shape every project*To3D worker function accepts. GSplats consumes displayDims + slicePosition; tolerance is required for API parity but isn't consulted by the WASM kernel (per-axis hidden- dim attenuation is computed from cholesky factors instead).

  • ndim: number

  • splatCount: number

  • OptionaldiscreteDims?: readonly number[]

    Indices of hidden dimensions that are discrete (binary visibility)

  • OptionaldiscreteSteps?: Record<number, number>

    Per-dimension step sizes for discrete dims (keyed by dim index)

  • OptionalextendToAllDims?: readonly number[]

    Indices of dimensions to skip entirely (extend_to_all — always visible)

  • Optionaltruncate?: number

    Truncation radius in sigmas for shifted Gaussian attenuation (defaults to GSPLAT_DEFAULT_TRUNCATION_RADIUS)

  • OptionalcolorComponents?: 3 | 4

    Components per color item: 3 (RGB, default) or 4 (RGBA — alpha = per-splat opacity)

  • OptionalemitSourceIndices?: boolean

    Ask the fused kernel to record which SOURCE splat each emitted slot came from (issue #1423). Only the general fused path compacts, so only it can answer; the caller sets this when the node publishes visible ranges and the inputs do NOT take the standard-3D fast path (isStandardGSplats3D). Costs 4 B/splat, so it is off by default.