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feat(ugc): hidden faces removed as LU Toolbox's Remove Hidden Faces decides them

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The 42 depth renders only saw faces in direct view, so faces reached only by
bounced light (interiors, recesses, rooms seen through openings) were removed.
UgcHsr traces the paths LU Toolbox's Cycles bake traces, directly from points
on each opaque triangle, and removes a triangle only when none of its paths
reaches the sky:

- points in rows along the triangle's longest side, hsr_sample_spacing apart
  (0.1143, 7 x 7 on a stud-sized square), at least hsr_min_points (28, the
  texels LU Toolbox bakes for a triangle), at most 4096
- hsr_samples (8) paths from each point, at most hsr_bounces (8) bounces, as
  Cycles 3.1 samples the bake material (Principled BSDF defaults: Burley
  diffuse and GGX specular, defensive sampling, Filter Glossy, 4 glossy
  bounces, Russian roulette from the second bounce, ensure_valid_reflection);
  no direct sky sampling (Cycles doesn't sample a flat world as a light)
- hsr_ground_plane: LU Toolbox's black box under LDD's floor
- decided per triangle, deterministic per model; triangles without area removed
- the VC pre-pass isn't done

Checked against LU Toolbox's operator in Blender 3.1.2 on the same meshes (27
models, 937,814 triangles): 501,362 removed there, 501,172 here, differences
as large as LU Toolbox's own between seeds. optimize_resolution is retired;
remove_hidden_faces=0 makes the same files as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-28 17:33:47 -05:00
parent 261fc60558
commit bea6b17b25
12 changed files with 1012 additions and 158 deletions
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9
dDashboardServer/routes/SettingsCatalog.cpp
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@@ -483,9 +483,12 @@ namespace {
c.Add(Text(UGC, "satin_colors", "Satin colors", "Satin (opal) color ids, comma separated: they stay transparent plastic (the client has no satin shader) but are made milky and less see-through. By default LEGO's satin colors 360,362,363,364,365,366,367,376 (none: off)." + notLive, "360,362,363,364,365,366,367,376"));
c.Add(Float(UGC, "satin_opacity", "Satin opacity", "Percent: the opacity of transparent satin bricks, instead of the transparent opacity.", "75", 0, 100));
c.Add(Float(UGC, "satin_whiten", "Satin whitening", "Percent: how far satin colors go towards white.", "20", 0, 100));
c.Add(Bool(UGC, "remove_hidden_faces", "Remove faces nobody can see", "", true));
c.Add(Bool(UGC, "hsr_ground_plane", "Nothing seen from below", "Also removes what can only be seen from under the model.", false));
c.Add(Unit(Int(UGC, "optimize_resolution", "Detail of the visibility renders", "", "1024", 64, 4096), "pixels"));
c.Add(Bool(UGC, "remove_hidden_faces", "Remove faces nobody can see", "LU Toolbox's Remove Hidden Faces: paths are traced from points on each opaque triangle, bouncing off the model; a triangle none of whose paths reaches the sky is removed.", true));
c.Add(Bool(UGC, "hsr_ground_plane", "Nothing seen from below", "Also removes what can only be seen from under the model (a black ground under LDD's floor).", false));
c.Add(Int(UGC, "hsr_samples", "Paths per point", "Paths traced from each point on a triangle (LU Toolbox's Samples). More finds more faces seen only through small gaps; slower.", "8", 1, 256));
c.Add(Int(UGC, "hsr_bounces", "Path bounces", "Bounces a path may take off the model before it gives up (Cycles' Max Bounces in LU Toolbox's bake).", "8", 0, 64));
c.Add(Float(UGC, "hsr_sample_spacing", "Point spacing", "Distance between the points paths start from, in LDD units (a stud is 0.8; 0.1143 puts 7 x 7 points on a stud-sized square). Smaller finds smaller visible parts of big faces; slower.", "0.1143", 0.01, 10));
c.Add(Int(UGC, "hsr_min_points", "Points per triangle at least", "Small triangles get this many points however close together (LU Toolbox bakes 28 texels for every triangle). Lower is faster but removes more faces that are only just seen.", "28", 1, 4096));
c.Add(Bool(UGC, "bake_ao", "Darken hidden corners", "Ambient occlusion baked into the vertex colors.", true));
c.Add(Int(UGC, "ao_samples", "Occlusion rays per vertex", "", "64", 1, 1024));
c.Add(Float(UGC, "ao_distance", "Occlusion distance", "", "5", 0, 1000));