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fix(ugc): each glitter brick gets its own fleck pattern

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Every glitter brick had the same flecks in the same places: the UVs were
the vertex positions projected on an axis plane, so bricks a whole tile
apart (and every brick of the same shape at the same spot in its own
model) looked identical. Each brick now has a number of its own
(UgcGlitter::BrickSeed, from the model's id and the brick's index, kept
per vertex in Mesh::brickSeeds) that turns the projection by an angle
and moves it by an offset under a tile, differently for each axis
plane. A model made again gets the same patterns; every LOD of a brick
the same one. The icon now draws the flecks on the UVs the .nif has
(Mesh::uvs read back by FromNif). New setting glitter_random (1; 0 puts
the same pattern on every brick as before). Non-glitter models are
byte-identical (hash tests unchanged).

Check in game: reprocess a model with several glitter bricks of the
same shape; the fleck patterns differ from brick to brick.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 00:17:43 -05:00
parent 0a1e33d3d2
commit 63bfaf545e
11 changed files with 148 additions and 11 deletions
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7
docs/UgcServer.md
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@@ -306,6 +306,7 @@ all of its levels, so each look needs a group of its own.
| `glitter_size` | 1.6 | The glitter texture's tile, in model units (a stud is 0.8): the flecks' spacing, the same on every brick. |
| `glitter_density` | 50 | Flecks in one tile. |
| `glitter_speed` | 1 | How fast the flecks drift: a tile in U in 7 s and in V in 11 s at 1; 0 keeps them still (no controllers). |
| `glitter_random` | 1 | Each glitter brick its own fleck pattern (turned and moved by the brick); 0: the same pattern on every brick. |
| `satin_colors` | 360,362,363,364,365,366,367,376 | Satin (opal) colors, see Satin below. The default: LEGO's color data's "Satin Colors" category (the Transparent ... Opal colors). Empty: the default; `none`: off. |
| `satin_opacity` | 75 | Percent: the vertex alpha of transparent satin bricks, instead of `transparent_opacity` or the Materials.xml alpha. |
| `satin_whiten` | 20 | Percent: how far satin colors are moved towards white (in linear RGB, after the color variation). |
@@ -352,7 +353,11 @@ flecks on a brick that is otherwise lit as plastic, and moving the texture trans
What a glitter shape has, beside what plastic shapes have (white material, alpha, specular, vertex colors):
- A UV set: each vertex's position on the axis plane its normal faces most, divided by `glitter_size`
(`UgcGlitter::Uv`), so the flecks are as dense on every brick and every side.
(`UgcGlitter::Uv`), so the flecks are as dense on every brick and every side, then turned by an angle and moved by
an offset under a tile that the brick picks for each plane (`glitter_random`, on by default): each brick's number
(`UgcGlitter::BrickSeed`, from the model's id and the brick's index, kept per vertex in `Mesh::brickSeeds`), so
no two bricks have the same pattern, every LOD of a brick has its own, and a model made again gets the same. The
icon draws the flecks on the UVs the .nif has (`Mesh::uvs`, read back by `UgcModel::FromNif`).
- An `NiTexturingProperty` (one per file, shared by both glitter groups): apply mode decal (fixed function would do
what the shader does), 9 slots, the base map only: wrap S and T, trilinear, UV set 0, a texture transform
(translation 0, scale 1, Maya method, center 0.5).