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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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dUgcServer/UgcServer.cpp
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@@ -122,6 +122,7 @@ namespace {
settings.shaders.glitterParams.tile = std::clamp(Setting<float>("glitter_size", 1.6f), 0.1f, 100.0f);
settings.shaders.glitterParams.flecks = std::min(Setting<uint32_t>("glitter_density", 50), 2000u);
settings.shaders.glitterParams.speed = std::clamp(Setting<float>("glitter_speed", 1.0f), 0.0f, 100.0f);
settings.shaders.glitterParams.random = Setting<int32_t>("glitter_random", 1) != 0;
// Which Materials.xml MaterialTypes are metal, brushed steel and glitter
for (const auto& [key, look] : { std::pair{ "metal_material_types", UgcModel::eLook::METAL }, std::pair{ "brushed_material_types", UgcModel::eLook::BRUSHED },
std::pair{ "glitter_material_types", UgcModel::eLook::GLITTER } }) {