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feat(ugc): one shape per transparent brick, as LU Toolbox leaves them

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LU Toolbox's Combine Transparent is off by default, so each transparent brick
is its own object and shape (the client can sort them). combine_transparent=1
joins them as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-27 09:38:51 -05:00
parent 7c5d69c1ed
commit 175db95c98
7 changed files with 53 additions and 3 deletions
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17
tests/dUgcTests/UgcTests.cpp
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@@ -375,6 +375,7 @@ TEST(UgcModel, ColorsLikeLuToolbox) {
plain.colorVariation = 0.0f;
const auto flat = UgcModel::Build(parts, library, plain);
EXPECT_EQ(flat.transparent.TriangleCount(), 12u); // only the all-transparent brick
EXPECT_EQ(flat.transparentBricks, std::vector<size_t>{ 0 });
EXPECT_EQ(flat.opaque.TriangleCount(), 60u);
EXPECT_NEAR(flat.opaque.colors[0].r * 255.0f, 222.0f, 0.5f);
EXPECT_FLOAT_EQ(flat.opaque.colors[0].a, 1.0f);
@@ -447,6 +448,22 @@ TEST(UgcModel, DividesAlongTheLongestSide) {
EXPECT_EQ(UgcModel::Divide(mesh, 100, 1000).size(), 1u);
}
TEST(UgcModel, SplitsTransparentBricksApart) {
// Two boxes in one mesh, one shape each (LU Toolbox leaves transparent bricks uncombined)
UgcBricks::BrickLibrary library(MakeRes(), 0);
std::string error;
const auto model = UgcModel::Build(UgcModel::ParseLxfml(R"(<LXFML versionMajor="5"><Bricks>
<Brick><Part designID="3001" materials="40"><Bone transformation="1,0,0,0,1,0,0,0,1,0,0,0"/></Part></Brick>
<Brick><Part designID="3001" materials="43"><Bone transformation="1,0,0,0,1,0,0,0,1,5,0,0"/></Part></Brick>
</Bricks></LXFML>)", error), library);
ASSERT_EQ(model.transparentBricks.size(), 2u);
const auto pieces = UgcModel::SplitAt(model.transparent, model.transparentBricks);
ASSERT_EQ(pieces.size(), 2u);
EXPECT_EQ(pieces[0].positions.size(), 8u);
EXPECT_EQ(pieces[1].TriangleCount(), 12u);
EXPECT_NEAR(pieces[1].positions[0].x, 5.0f, 1e-5f);
}
TEST(UgcFormats, LodNifReadsBack) {
UgcModel::Mesh near, far;
near.positions = { { 0, 0, 0 }, { 1, 0, 0 }, { 0, 1, 0 }, { 1, 1, 0 } };