Keep all solid geometry GPU-resident during navigation. Use vertex-rate instancing, compact untextured vertices, vertex-cache ordering, and cached silhouette sources without culling geometry.
The shaded surface of a curved solid was visibly coarser than its own
wireframe: the wire ran along the true rim while the facets cut inside it.
Two things were wrong, and only one was the tolerance.
`facet_res` is a resolution multiplier — the same one `scale_lod` divides the
fallback sampler's chord fraction by — and the kernel path was using it as a
sag in world units. At the default that asks for a whole unit of departure, so
nothing smaller than a metre subdivided at all and a face was only ever as
round as its own boundary. It is a fraction of each surface's own radius now,
which carries no assumption about the drawing's units.
And it is the *edges'* fraction, shared from `EDGE_CHORD_FRAC` rather than
copied. Those edges are drawn over these faces; sampling the two differently
is what put the wire across a facet instead of along its corners. `facet_res`
is deliberately not applied either, since the edges it must line up with are
built once at highest detail and never scaled.
A torus is measured by its tube rather than its ring — the tube is the tighter
bend, and sampling to the ring leaves the section a hexagon.
The primitive-volume test claimed a mesh can never read over its true size.
That holds for a convex solid, where every chord lies inside; a torus is not
one, and across the inside of its tube the chords fall outside the material.
It passed before only because the sampling was too coarse to show it.
Co-Authored-By: Claude Opus 5 <[email protected]>
Faces were being dropped for sitting a nanometre off their own plane.
An edge is shared by two faces and in a real file cannot lie exactly on both:
the two surfaces were fitted separately and written to finite precision. Asked
for exactness, the kernel decides the edge is not on its plane, declines to
project it, and the face goes undrawn — silently, since a face that cannot be
expressed is reported as absent rather than as an error.
A micrometre in a drawing measured in metres recovers twenty-six walls of one
building. Loosening further buys almost nothing — a hundredth of this finds
one more face in sixty thousand — and past that it would start accepting
geometry that really is wrong, so it stops here.
With the tube fix that came with the kernel bump, VILLA_NEU_IFC3.dwg now
meshes 59015 of its 59033 faces, from 58922.
Co-Authored-By: Claude Opus 5 <[email protected]>
Two faults kept faces out of a lifted solid, and both looked like a document
problem rather than a reader one — the lift reported no loss at all.
An edge's stored parameter pair can span the right length from the wrong
place, putting a straight curve beside the face it bounds instead of along
it. And a loop's coedges are not always listed in the order the ring runs,
which the old chaining could not fix: it reversed the next piece in the list,
where what was needed was a different piece.
Either one leaves a ring that crosses itself, which ear clipping declines, so
the face is dropped without a word.
Handle 176 of Annotation-2D-Mesh-Solid-BIM.dwg now meshes all fourteen of its
faces, where it managed ten. Across that file: 105 of 107 solids complete, 865
of 867 faces. Across VILLA_NEU_IFC3.dwg: 672 of 763 solids, 58922 of 59033
faces.
The fallback sampler stays until that reaches all of them — a complete mesh is
what stops it running, and 111 faces still need it.
Co-Authored-By: Claude Opus 5 <[email protected]>
Faces with holes were drawing the hole filled and the material around it
missing. Handle 176 in Annotation-2D-Mesh-Solid-BIM.dwg is one.
Co-Authored-By: Claude Opus 5 <[email protected]>
Hakan Seven