Replace fixed-interval yields (every 4096 iterations) with time-based
yields (every ~100ms of wall time). In foreground tabs this means ~10
yields per second instead of ~50-200, with identical UI responsiveness.
In background tabs where setTimeout(0) is throttled to ~1s, this
reduces overhead from ~200 wasted seconds to ~10 — the export runs
nearly as fast in the background as in the foreground.
Addresses #2 (background tab resource allocation).
Round 2 of performance and correctness improvements:
- Spatial grid index for brush painting: forEachTriInSphere now queries
only nearby grid cells instead of scanning all triangles. ~5.7x faster
for brush operations on 68k+ tri meshes.
- Decimation overflow fix: hasLinkViolation used a fixed 0x200000
multiplier for vertex-pair keys, overflowing at >2M vertices.
Now uses dynamic multiplier based on actual vertex count.
- Decimation determinant threshold: solveQ used absolute 1e-10 which
fails for large coordinates. Now relative to matrix element magnitude.
- 3MF triangle index validation: bounds-check all parsed indices against
vertex count, throw clear error on corrupt files instead of silent NaN.
- File size limit: reject files >500 MB before loading into memory,
prevents browser tab crash on oversized files.
- Accessibility: preset swatches now keyboard-navigable (role=button,
tabindex=0, Enter/Space to select). Modal dialogs trap focus and
close on Escape.
- Ctrl+click straight line tool: click to set start point, Ctrl+click
to paint a straight line between points. Ctrl+hover shows preview.
- Precision masking available for radius brush mode.
- Spatial grid rebuilt when entering/leaving precision mode.
Write binary STL directly from BufferGeometry typed arrays using
Uint8Array.set() bulk copies. Eliminates the Three.js STLExporter
overhead: no Mesh/Material creation, no identity matrix multiplication,
no redundant normal recomputation, no per-float DataView calls.
- SoAHeap: hole method for bubbleUp/sinkDown (half the typed-array
writes per heap level vs the old swap approach).
- Seed dedup: Number keys instead of BigInt when vertex count < 94M
(10-50x faster per key). BigInt fallback for extreme meshes.
- addCreaseQuadrics: encode face pairs as negative numbers instead
of allocating small arrays per edge.
- Guard 3 (checkFlipped): single branch for corner index instead of
9 ternary operations per face.
- Yield interval kept at 4096 with setTimeout(0) for reliable UI updates.
- Render loop now only calls renderer.render() when the scene actually
changed (needsRender flag + requestRender export). Idle GPU usage
drops to near zero.
- Disabled shadow map (no receiver in scene, wasted a full render pass).
- Reuse overlay materials instead of creating new ones every paint frame.
- Dispose CanvasTexture in getEffectiveMapEntry (VRAM leak on every
slider change).
- Dispose axes/dimension geometry on model reload.
- Reuse Vector3/Quaternion temp objects in pointer/touch/wheel handlers
instead of allocating ~10 objects per mouse event.
- RAF-batch mousemove for hover/cursor, keep paint events immediate.
- Reuse faceMask buffer attribute when size matches.
- Cache getEffectiveMapEntry result (skip canvas tiling+blur when
texture and smoothing haven't changed).
- addSmoothNormals: same dedup+flat-array approach as displacement.
Displacement, subdivision and exclusion all used template-string keys
for vertex dedup and edge lookup maps. Replaced with a single numeric
dedup pass + flat typed arrays (Float64Array / Uint8Array), cutting
displacement time by ~2.5x and subdivision by ~2.4x on a 68k tri STL.
- displacement.js: vertex dedup → flat arrays for smooth normals,
zone areas, masked fractions, displacement cache, excluded set
- subdivision.js: numeric edge keys (a*maxV+b) instead of template strings
- exclusion.js: numeric edge keys, BFS queue.shift() → index pointer,
adjacency Map → Array, TypedArray.set() for overlay copy
- mapping.js: Math.pow(x,4) → x²·x², cos/sin cached per computeUV call,
applyTransform signature changed to accept precomputed cos/sin
- Added stripes.png and stripes_02.png with metadata from Adobe Photoshop.
- Included two new woodgrain textures (woodgrain_02.jpg and woodgrain_03.jpg) for enhanced visual variety.
- Renamed "Surface Mask" section to "Mask Angles" for clarity in index.html.
- Updated translation keys and tooltips to reflect the new terminology in i18n.js.
- Removed the erase toggle button from the exclusion panel and implemented Shift key functionality to toggle erase mode in main.js.
- Adjusted brush radius handling to improve user experience and updated related UI elements in index.html.
- Enhanced the subdivision process to track original face IDs for better masking accuracy in subdivision.js.
- Added CSS styles for new UI elements and improved layout in style.css.
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