feat(segmentation): add the segment model, masks, algorithms and render helpers - #962
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PaulHax
added this pull request to stack #965
September 21, 2026 20:08
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…er helpers Adds the framework-free layer of the segmentation module: the segment and mask model, geometry helpers, colour parsing, bounded mask storage with overlap planning and voxel access, the fill-holes and gaussian smooth algorithms with their workers, the shared identity registry, the reference coordinator, and the display, projection and render-mask helpers. Nothing consumes them yet; the store, persistence, tools and UI that do follow in the next change. Also adds reorientLabelImage, which ensureSameSpace uses to reorder an equivalent voxel grid onto its image without interpolating label boundaries.
The label path of ensureSameSpace only skipped vtkImageReslice when the product of the source worldToIndex and the target indexToWorld was a bit-exact identity matrix. Real geometry never satisfies that: with an origin and spacing such as [-120.1, -98.4, 33.7] and [0.7, 0.7, 3] the product carries float error of about 1e-5, so a labelmap that already sat on its parent's grid was copied through a full nearest-neighbour reslice on the main thread, once per imported or restored mask. The axis and eight-corner checks just above already prove the two grids coincide within the function's 1e-3 tolerance, so the identity test now only asks that the mapping neither permutes nor flips an axis, and the source image is returned as-is in that case. Permuted, flipped and genuinely different grids keep going through the reslice.
masksHolding and masksClearing.claim swept the reaching masks with some/forEach, so every voxel a brush or polygon fill walked allocated a fresh callback capturing i, j and k. Both now sweep the reaching masks with a plain indexed loop, so the per-voxel path allocates nothing. The answers are unchanged.
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Adds the segmentation model and supporting operations: shared segment identity and appearance, image-scoped mask records, bounded binary storage, overlap planning and voxel access, geometry and color handling, and display and export helpers. It also provides fill-holes and Gaussian smoothing workers, segment-reference tracking, and coordination between temporary previews and committed edits.
Labelmap alignment uses the new
reorientLabelImagehelper throughensureSameSpace. An already aligned image is reused; equivalent grids with permuted or flipped axes are remapped with nearest-neighbor interpolation to preserve label boundaries.Suggested reading order:
src/segmentation/model.tsandsegment.ts;masks/andgeometry.ts;segmentRegistry.ts,segmentReferences.tsandediting/coordinator.ts; thenediting/algorithms/,rendering/, andsrc/io/resample/reorientLabelImage.ts.