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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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2
resources/ugcconfig.ini
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@@ -95,6 +95,7 @@ brushed_colors=298,300,1002,1004
# over the color and moves it. 0: off, glitter stays plastic.
# glitter_size: the fleck texture's tile in model units (a stud is 0.8); glitter_density: flecks in a tile;
# glitter_speed: 1 moves the flecks a tile in 7 s one way and 11 s the other, 0 keeps them still.
# glitter_random: 1 places each brick's flecks its own way (turned and moved by the brick), 0 the same on every brick.
# glitter_colors: LEGO color ids that are glitter whatever their type (empty: the default, 114,117, which LEGO's color
# data calls glitter; none: no colors)
shader_glitter=21
@@ -103,6 +104,7 @@ glitter_colors=114,117
glitter_size=1.6
glitter_density=50
glitter_speed=1
glitter_random=1
# Satin (opal) colors stay transparent plastic (the client has no satin shader) but are made milky:
# satin_colors: color ids (empty: the default, LEGO's satin colors 360,362,363,364,365,366,367,376; none: off),
# satin_opacity: their transparent bricks' opacity in percent (instead of transparent_opacity),