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feat(editor): add --merge-meshes for combining two WOMs into one

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Concatenates two WOMs into a single output. Vertex buffer is the
two inputs spliced; the second mesh's indices are offset by the
first mesh's vertex count; texture slots from both are appended;
batches from the second mesh have their indexStart shifted by the
first's index count and their textureIndex shifted by the first's
texture-slot count.

Single-batch / no-batch inputs are auto-promoted to one synthetic
batch each so the merged output is always a well-formed v3.

Bones/animations are NOT merged — that requires skeleton retargeting
which is out of scope. If either input has bones, the merged output
is treated as static (bones cleared, weights reset to identity-on-
bone-0) so renderers don't read mismatched indices.

Verified: cube (24v/12t/1 batch) + sphere translated to +X (221v/
384t/1 batch) → combined (245v/396t/2 batches/2 textures), bounds
union (-0.5..3.5 in X), clean v3 reload via --info-mesh. Brings
command count to 226.
This commit is contained in:
Kelsi 2026-05-07 07:52:17 -07:00
parent e49d8dd738
commit 3852bac1d8
1 changed files with 125 additions and 0 deletions
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125
tools/editor/main.cpp
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@ -556,6 +556,8 @@ static void printUsage(const char* argv0) {
std::printf(" Invert every vertex normal (use for inside-out meshes or two-sided pre-flip)\n");
std::printf(" --mirror-mesh <wom-base> <x|y|z>\n");
std::printf(" Mirror every vertex + normal across the chosen axis (also flips winding)\n");
std::printf(" --merge-meshes <a-base> <b-base> <out-base>\n");
std::printf(" Combine two WOMs into one (vertex/index buffers concatenated, batches preserved)\n");
std::printf(" --add-item <zoneDir> <name> [id] [quality] [displayId] [itemLevel]\n");
std::printf(" Append one item entry to <zoneDir>/items.json (auto-creates the file)\n");
std::printf(" --list-items <zoneDir> [--json]\n");
@ -978,6 +980,7 @@ int main(int argc, char* argv[]) {
"--scale-mesh", "--translate-mesh", "--strip-mesh",
"--gen-texture-noise", "--rotate-mesh",
"--center-mesh", "--flip-mesh-normals", "--mirror-mesh",
"--merge-meshes",
"--gen-texture-radial",
"--validate-glb", "--info-glb", "--info-glb-tree", "--info-glb-bytes",
"--validate-jsondbc", "--check-glb-bounds", "--validate-stl",
@ -16928,6 +16931,128 @@ int main(int argc, char* argv[]) {
wom.boundMin.x, wom.boundMin.y, wom.boundMin.z,
wom.boundMax.x, wom.boundMax.y, wom.boundMax.z);
return 0;
} else if (std::strcmp(argv[i], "--merge-meshes") == 0 && i + 3 < argc) {
// Combine two WOMs into one. The second mesh's indices
// are offset by the first mesh's vertex count, and its
// batches are appended with their indexStart shifted by
// the first mesh's index count and their textureIndex
// shifted by the first mesh's texture-slot count.
//
// Bones/animations are NOT merged — that requires
// skeleton retargeting which is beyond a simple
// concatenation. If either input has bones, the merged
// output is treated as static (bones cleared, weights
// reset to identity-on-bone-0) so renderers don't read
// mismatched indices.
std::string aBase = argv[++i];
std::string bBase = argv[++i];
std::string outBase = argv[++i];
auto stripExt = [](std::string p) {
if (p.size() >= 4 && p.substr(p.size() - 4) == ".wom") {
return p.substr(0, p.size() - 4);
}
return p;
};
aBase = stripExt(aBase);
bBase = stripExt(bBase);
outBase = stripExt(outBase);
if (!wowee::pipeline::WoweeModelLoader::exists(aBase)) {
std::fprintf(stderr,
"merge-meshes: %s.wom does not exist\n", aBase.c_str());
return 1;
}
if (!wowee::pipeline::WoweeModelLoader::exists(bBase)) {
std::fprintf(stderr,
"merge-meshes: %s.wom does not exist\n", bBase.c_str());
return 1;
}
auto a = wowee::pipeline::WoweeModelLoader::load(aBase);
auto b = wowee::pipeline::WoweeModelLoader::load(bBase);
if (!a.isValid() || !b.isValid()) {
std::fprintf(stderr,
"merge-meshes: failed to load one of the inputs\n");
return 1;
}
wowee::pipeline::WoweeModel out;
out.name = std::filesystem::path(outBase).stem().string();
out.version = 3;
out.vertices = a.vertices;
out.vertices.insert(out.vertices.end(),
b.vertices.begin(), b.vertices.end());
out.indices = a.indices;
uint32_t indexOffset = static_cast<uint32_t>(a.vertices.size());
for (uint32_t idx : b.indices) {
out.indices.push_back(idx + indexOffset);
}
out.texturePaths = a.texturePaths;
uint32_t textureOffset = static_cast<uint32_t>(a.texturePaths.size());
for (const auto& t : b.texturePaths) {
out.texturePaths.push_back(t);
}
// Promote single-batch / no-batch inputs into proper
// batches so the merged output is well-formed v3.
auto ensureBatch = [](const wowee::pipeline::WoweeModel& m) {
std::vector<wowee::pipeline::WoweeModel::Batch> bs = m.batches;
if (bs.empty()) {
wowee::pipeline::WoweeModel::Batch only;
only.indexStart = 0;
only.indexCount = static_cast<uint32_t>(m.indices.size());
only.textureIndex = 0;
only.blendMode = 0;
only.flags = 0;
bs.push_back(only);
}
return bs;
};
auto aBatches = ensureBatch(a);
auto bBatches = ensureBatch(b);
for (const auto& bt : aBatches) out.batches.push_back(bt);
uint32_t indexStartOffset = static_cast<uint32_t>(a.indices.size());
for (auto bt : bBatches) {
bt.indexStart += indexStartOffset;
bt.textureIndex += textureOffset;
out.batches.push_back(bt);
}
// Static-only output (see header comment).
for (auto& v : out.vertices) {
v.boneWeights[0] = 255;
v.boneWeights[1] = 0;
v.boneWeights[2] = 0;
v.boneWeights[3] = 0;
v.boneIndices[0] = 0;
v.boneIndices[1] = 0;
v.boneIndices[2] = 0;
v.boneIndices[3] = 0;
}
// Bounds: union of inputs.
out.boundMin = glm::min(a.boundMin, b.boundMin);
out.boundMax = glm::max(a.boundMax, b.boundMax);
out.boundRadius = glm::length(out.boundMax - out.boundMin) * 0.5f;
std::filesystem::path outPath(outBase);
std::filesystem::create_directories(outPath.parent_path());
if (!wowee::pipeline::WoweeModelLoader::save(out, outBase)) {
std::fprintf(stderr,
"merge-meshes: failed to save %s.wom\n", outBase.c_str());
return 1;
}
std::printf("Merged %s.wom + %s.wom -> %s.wom\n",
aBase.c_str(), bBase.c_str(), outBase.c_str());
std::printf(" vertices : %zu = %zu + %zu\n",
out.vertices.size(),
a.vertices.size(), b.vertices.size());
std::printf(" indices : %zu = %zu + %zu\n",
out.indices.size(),
a.indices.size(), b.indices.size());
std::printf(" batches : %zu = %zu + %zu\n",
out.batches.size(),
aBatches.size(), bBatches.size());
std::printf(" textures : %zu = %zu + %zu\n",
out.texturePaths.size(),
a.texturePaths.size(), b.texturePaths.size());
std::printf(" bounds : (%.3f, %.3f, %.3f) - (%.3f, %.3f, %.3f)\n",
out.boundMin.x, out.boundMin.y, out.boundMin.z,
out.boundMax.x, out.boundMax.y, out.boundMax.z);
return 0;
} else if (std::strcmp(argv[i], "--add-texture-to-zone") == 0 && i + 2 < argc) {
// Import an existing PNG into a zone directory. Useful
// for the "I have an artist-painted texture, get it into