Jackson Oursland efa2cae0b4 Viewport: draw faded and see-through bodies from their plans with OIT (#7423) ...

* Viewport: palette-indexed scene and incremental appearance updates

- Move triangle, line and instance colours and opacity into a per-scene
  palette (an R32Uint texture, WebGL2-safe); appearance edits update
  palette entries instead of vertex bytes.
- Build CPU body triangles as one canonical vertex stream per block with
  opaque/glass/faded index lists; an opacity class change rewrites only
  the index list.
- Cache resolved body appearances by a per-body key, so an edit resolves
  only the bodies whose look changed.
- Split the model scene key from the session revision: selection and
  view-only commands no longer rebuild or upload the model scene.
- Replace the O(n^2) section-index lookup and per-placement instance scan
  with hash lookups.

Co-Authored-By: Claude Code <noreply@anthropic.com>

* Viewport: skip unchanged palette work when rebuilding

- Reuse each body's appearance key while the document is unchanged.
- Leave a palette slot alone when its value did not change, and allocate
  every body's slots once before the build loop.

Co-Authored-By: Claude Code <noreply@anthropic.com>

* Viewport: measure scene rebuild cost by edit kind

An ignored scale test times the scene build after selection, appearance,
theme and one-body geometry edits at 200, 1,000 and 5,000 bodies.

Co-Authored-By: Claude Code <noreply@anthropic.com>

* Viewport: read faded grid alphas through the scene palette

The grid-fade tests now resolve line palette indices instead of reading the
line record's old colour byte.

Co-Authored-By: Claude Code <noreply@anthropic.com>

* Viewport: measure rebuild cost on few large meshes

Adds the 20/100-torus case where a block rebuild used to re-emit a large
part of the model.

Co-Authored-By: Claude Code <noreply@anthropic.com>

* Viewport: measure rebuild cost on an assembly

Unique detailed parts plus one component placed many times, timed for
selection, part and component colour, opacity, theme, hide and move.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: draw block classes as vertex runs, not index lists

A body's vertices are three per triangle in mesh order, so each draw class
is a few runs of the block's vertex buffer: all-opaque blocks need no index
buffer, and an opacity class change uploads nothing. A fragmented class
(more than 64 runs) falls back to one index buffer.

Each triangle is written as one record into a block reserved up front,
which takes the cold scene build of a 7.1M-triangle assembly from 97 ms
to 55 ms (main: 83 ms).

Also fix reindexing a block whose bodies are drawn elsewhere: it walked
the mesh's triangles from that body's start, past its own vertices.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: draw the highlight's own block, and light faded bodies without copies

The highlight scene keeps its feedback (a hovered face, a body copied on
the CPU) in a block of its own; since blocks became vertex runs, only the
model's blocks were drawn, so that feedback was uploaded and never shown.
Draw the highlight's blocks with its triangles.

Whole faded and see-through bodies (another component active, or an
appearance below full opacity) were lit by copying every triangle on the
CPU at each hover change: 85 ms for a design row of 812 bodies. They are
now drawn again from the model's own block vertices, in the highlight
palette with their slots set to the highlight colour, or as placements of
the model's shared triangles. The picture is the same as the copy's.

Adds a GPU frame benchmark for document-tree hover (ignored test).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: count scene uploads, and keep the sorted glass stream across colour edits

Renderer::uploads reports the bytes the model scene's last change uploaded
(geometry, placements, palette rows, planned colours, re-evaluated vertices).
Without order-independent transparency the global glass stream is kept while
the blocks' see-through triangles are the same, so a colour edit on a glass
body uploads palette rows only. Tests assert both on a GPU.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: keep palette slots and looks without rehashing every body

A rebuild found every body's palette slots by name and wrote them back,
allocating and hashing a new key per body, and copied every shown name into a
set to check the arena still belongs to the design. Slots are written back only
when a body's faces grew, and the looks cache is pruned only when it holds more
bodies than are shown. Adds the STEP-file benchmark (SOLIDCRAFT_SCALE_STEP) and
the colour command's own time to the assembly benchmark.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: round-pick construction lines through the scene palette

The axis and centre feedback for round picks (#4610) drew with a raw colour;
on the palette scene it is interned once like the other construction geometry.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Viewport: draw faded and see-through bodies from their plans with OIT

A body faded outside the active component, or see-through, left the GPU
tessellation path and was built triangle by triangle on the CPU, so working in
a component of a large assembly rebuilt every other body. Where the renderer
blends see-through surfaces order-independently (GpuTarget::oit, set by the
renderer), a body whose faces share one class is drawn from its plan: chunks
are split by class, opaque passes, AO and the section draw only opaque chunks,
and the OIT pass draws the rest. The sorted fallback keeps them on the CPU.
The model and its highlights decide through one rule (model_plan_class).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Code <noreply@anthropic.com>

2026-10-27 03:27:32 +00:00

..

viewport.wgsl

Viewport: draw faded and see-through bodies from their plans with OIT (#7423)

2026-10-27 03:27:32 +00:00