Every line was drawn 1px regardless of its CAD lineweight. Two causes:
the dwg-wasm parseResult never carried the field (acadrust reads
EntityCommon::line_weight but it was dropped in serialization), and the
renderer merged all segments into one LineSegments whose
LineBasicMaterial.linewidth WebGL ignores.
Resolve ByLayer/ByBlock/Default per entity and bucket segments by
dash|lineweight. Weighted buckets get their own LineSegments2 +
LineMaterial with worldUnits:false, so width stays constant in pixels
while zooming - AutoCAD LWDISPLAY semantics - at 8 px/mm (0.25mm = 2px).
Anything at or below the 0.25mm default stays in the hairline batch so
drawings that never assigned a weight render exactly as before.
Fat batches are instanced, so layer masking compacts the instance buffer
and lowers instanceCount instead of rewriting an index; slotOf tracks
where each segment moved so the selection highlight still finds its
vertices. Per-entity color spans (meta.spans) let the highlight repaint
across the hairline batch and every bucket it touched. Buckets past
400k segments fall back to hairline to bound GPU/heap cost.
Display follows the drawing's LWDISPLAY and can be forced from the
toolbar; the property panel now shows the entity lineweight.
Verified headless at a fixed camera on the 65k-entity road drawing:
cyan road edge 2px -> 5px, layer hide/restore returns the exact baseline
pixel counts, and a 0.35mm LWPOLYLINE selects and highlights.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
setHiddenLayers() called load(result, {keepView:true}), so every layer
on/off re-parsed and re-tessellated the whole drawing — arc sampling,
hatch triangulation, complex linetypes and the Slug text batch all rebuilt
from scratch. On an 18 MB DWG a single eye-icon click took 5 s+.
Build every layer once, then switch geometry on and off:
- Merged LineSegments buffers get an index buffer plus a per-segment layer
id (_registerIndexed). A toggle rewrites the index and setDrawRange;
positions, colors and lineDistances are untouched, so draw order, dash
phase and the selection-highlight offsets in meta.colStart stay valid.
- Per-entity meshes (hatch fills, SOLID quads, arrowheads, OLE images,
sprites) are tagged by layer via _addObj and toggled with .visible.
- Slug text builds one merged mesh per CAD layer instead of one per
draw order, so text hides with a visible flag. The shader source is
identical across batches, so three still shares one WebGLProgram.
- Hidden geometry stays in the pick buffers, so _onClick now skips it via
the _metaHidden mask.
- Fit keeps framing only what is drawn: per-layer Box3 + fit samples are
recorded at build and unioned over the visible layers.
- getLayerInfo() caches the O(entities) name/color/count pass per load;
only the visible flag is recomputed.
Layer panel: one delegated click listener instead of re-binding a handler
per row, and a toggle patches the affected row's opacity/icon in place
rather than regenerating the whole list's innerHTML.
Trade-off: hidden layers are now built and kept in memory, so loading a
file with layers already off costs what a full load costs.
Rebuilds dist2.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
