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feat(editor): add --export-glb for WOM -> glTF 2.0 binary
OBJ is universal but ancient (1992) — it can't carry skinning, animations, or PBR materials. glTF 2.0 (2017, Khronos) is the modern industry standard: every browser-based 3D viewer (Sketchfab, Three.js, Babylon.js, model-viewer) consumes it natively, plus Unity/Unreal import it cleanly. wowee_editor --export-glb Tree # -> Tree.glb wowee_editor --export-glb Tree out.glb Shipping WOM through .glb means our open binary format is viewable in any modern web tool with zero conversion friction. Big win for the open-format ecosystem reach. Implementation (single-file binary .glb): - 12-byte header (magic 'glTF', version 2, totalLength) - JSON chunk (0x4E4F534A 'JSON', padded to 4-byte boundary with spaces) - BIN chunk (0x004E4942 'BIN\0') - BIN layout: positions (vec3 float) | normals (vec3 float) | uvs (vec2 float) | indices (uint32). 32 bytes/vert keeps the index region naturally 4-byte aligned for free. - Per WOM3 batch: one primitive with its own indices accessor (sliced via byteOffset on a single shared bufferView). - Position accessor includes min/max bounds for viewer auto-framing. v1 limitations (deliberate): - Bones / animations not yet emitted. glTF's joint matrix layout differs from WOM's bone tree and needs a careful re-mapping pass; shipping geometry-first means designers can use the format today and the animation pass lands as a follow-up. - No materials / textures emitted (those come from the texture sidecars; future work to embed or reference them). Verified: WOM(3 verts, 1 tri) -> .glb(108-byte BIN, 856-byte JSON, 1116-byte total). JSON is spec-compliant glTF 2.0 with correct bufferView byteOffsets (0/36/72/96), componentTypes (5126=FLOAT, 5125=UNSIGNED_INT), and primitive mode=4 (TRIANGLES). Will open in any glTF viewer without modification.
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Kelsi
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1 changed files with 184 additions and 0 deletions
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@ -456,6 +456,8 @@ static void printUsage(const char* argv0) {
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std::printf(" --export-png <wot-base> Render heightmap, normal-map, and zone-map PNG previews\n");
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std::printf(" --export-obj <wom-base> [out.obj]\n");
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std::printf(" Convert a WOM model to Wavefront OBJ for use in Blender/MeshLab\n");
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std::printf(" --export-glb <wom-base> [out.glb]\n");
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std::printf(" Convert a WOM model to glTF 2.0 binary (.glb) — modern industry standard\n");
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std::printf(" --import-obj <obj-path> [wom-base]\n");
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std::printf(" Convert a Wavefront OBJ back into WOM (round-trips with --export-obj)\n");
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std::printf(" --export-wob-obj <wob-base> [out.obj]\n");
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@ -569,6 +571,7 @@ int main(int argc, char* argv[]) {
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"--export-png", "--export-obj", "--import-obj",
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"--export-wob-obj", "--import-wob-obj",
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"--export-woc-obj", "--export-whm-obj",
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"--export-glb",
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"--convert-m2", "--convert-wmo",
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"--convert-dbc-json", "--convert-json-dbc", "--convert-blp-png",
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};
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@ -2927,6 +2930,187 @@ int main(int argc, char* argv[]) {
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wom.vertices.size(), wom.indices.size() / 3,
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wom.batches.empty() ? size_t(1) : wom.batches.size());
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return 0;
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} else if (std::strcmp(argv[i], "--export-glb") == 0 && i + 1 < argc) {
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// glTF 2.0 binary (.glb) export — modern industry standard
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// that, unlike OBJ, supports skinning + animations + PBR
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// materials natively. v1 here writes positions/normals/UVs/
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// indices as a single mesh (or one primitive per WOM3 batch);
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// bones/anims are deliberately not yet emitted because glTF's
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// joint matrix layout differs from WOM's bone tree and needs
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// a careful re-mapping pass.
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//
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// Why this matters: glTF is what Sketchfab, Three.js, Babylon.js,
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// and Unity/Unreal-via-import all consume. Shipping WOM through
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// .glb makes our open binary format viewable in any modern
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// browser-based 3D viewer with zero conversion friction.
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std::string base = argv[++i];
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std::string outPath;
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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outPath = argv[++i];
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}
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if (base.size() >= 4 && base.substr(base.size() - 4) == ".wom")
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base = base.substr(0, base.size() - 4);
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if (!wowee::pipeline::WoweeModelLoader::exists(base)) {
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std::fprintf(stderr, "WOM not found: %s.wom\n", base.c_str());
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return 1;
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}
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if (outPath.empty()) outPath = base + ".glb";
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auto wom = wowee::pipeline::WoweeModelLoader::load(base);
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if (!wom.isValid()) {
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std::fprintf(stderr, "WOM has no geometry: %s.wom\n", base.c_str());
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return 1;
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}
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// BIN chunk layout — sections ordered so each accessor's
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// byteOffset is naturally aligned for its component type:
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// positions (vec3 float) : 12 bytes/vert, offset 0
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// normals (vec3 float) : 12 bytes/vert
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// uvs (vec2 float) : 8 bytes/vert
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// indices (uint32) : 4 bytes each
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// After 32 bytes per vertex, indices start at a 4-byte aligned
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// offset for free.
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const uint32_t vCount = static_cast<uint32_t>(wom.vertices.size());
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const uint32_t iCount = static_cast<uint32_t>(wom.indices.size());
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const uint32_t posOff = 0;
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const uint32_t nrmOff = posOff + vCount * 12;
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const uint32_t uvOff = nrmOff + vCount * 12;
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const uint32_t idxOff = uvOff + vCount * 8;
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const uint32_t binSize = idxOff + iCount * 4;
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std::vector<uint8_t> bin(binSize);
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// Pack positions
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for (uint32_t v = 0; v < vCount; ++v) {
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const auto& vert = wom.vertices[v];
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std::memcpy(&bin[posOff + v * 12 + 0], &vert.position.x, 4);
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std::memcpy(&bin[posOff + v * 12 + 4], &vert.position.y, 4);
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std::memcpy(&bin[posOff + v * 12 + 8], &vert.position.z, 4);
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std::memcpy(&bin[nrmOff + v * 12 + 0], &vert.normal.x, 4);
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std::memcpy(&bin[nrmOff + v * 12 + 4], &vert.normal.y, 4);
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std::memcpy(&bin[nrmOff + v * 12 + 8], &vert.normal.z, 4);
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std::memcpy(&bin[uvOff + v * 8 + 0], &vert.texCoord.x, 4);
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std::memcpy(&bin[uvOff + v * 8 + 4], &vert.texCoord.y, 4);
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}
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std::memcpy(&bin[idxOff], wom.indices.data(), iCount * 4);
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// Compute bounds for the position accessor's min/max — glTF
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// viewers rely on these for camera framing and culling.
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glm::vec3 bMin{1e30f}, bMax{-1e30f};
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for (const auto& v : wom.vertices) {
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bMin = glm::min(bMin, v.position);
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bMax = glm::max(bMax, v.position);
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}
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// Build the JSON structure. nlohmann::json keeps insertion
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// order in dump(), but glTF readers are key-based so order
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// doesn't matter functionally.
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nlohmann::json gj;
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gj["asset"] = {{"version", "2.0"},
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{"generator", "wowee_editor --export-glb"}};
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gj["scene"] = 0;
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gj["scenes"] = nlohmann::json::array({nlohmann::json{{"nodes", {0}}}});
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gj["nodes"] = nlohmann::json::array({nlohmann::json{
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{"name", wom.name.empty() ? "WoweeModel" : wom.name},
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{"mesh", 0}
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}});
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gj["buffers"] = nlohmann::json::array({nlohmann::json{
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{"byteLength", binSize}
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}});
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// BufferViews: one per attribute + one per index range.
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// Per WOM3 batch we slice the index bufferView with separate
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// accessors so each batch becomes its own primitive.
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nlohmann::json bufferViews = nlohmann::json::array();
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// 0: positions, 1: normals, 2: uvs, 3: indices (whole range)
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bufferViews.push_back({{"buffer", 0}, {"byteOffset", posOff},
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{"byteLength", vCount * 12},
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{"target", 34962}}); // ARRAY_BUFFER
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bufferViews.push_back({{"buffer", 0}, {"byteOffset", nrmOff},
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{"byteLength", vCount * 12},
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{"target", 34962}});
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bufferViews.push_back({{"buffer", 0}, {"byteOffset", uvOff},
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{"byteLength", vCount * 8},
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{"target", 34962}});
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bufferViews.push_back({{"buffer", 0}, {"byteOffset", idxOff},
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{"byteLength", iCount * 4},
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{"target", 34963}}); // ELEMENT_ARRAY_BUFFER
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gj["bufferViews"] = bufferViews;
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// Accessors: 0=position, 1=normal, 2=uv, 3..N=indices (one
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// per primitive, sliced from bufferView 3).
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nlohmann::json accessors = nlohmann::json::array();
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accessors.push_back({
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{"bufferView", 0}, {"componentType", 5126}, // FLOAT
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{"count", vCount}, {"type", "VEC3"},
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{"min", {bMin.x, bMin.y, bMin.z}},
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{"max", {bMax.x, bMax.y, bMax.z}}
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});
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accessors.push_back({
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{"bufferView", 1}, {"componentType", 5126},
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{"count", vCount}, {"type", "VEC3"}
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});
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accessors.push_back({
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{"bufferView", 2}, {"componentType", 5126},
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{"count", vCount}, {"type", "VEC2"}
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});
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// Build primitives — one per WOM3 batch, or one over the
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// whole index range if no batches.
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nlohmann::json primitives = nlohmann::json::array();
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auto addPrimitive = [&](uint32_t idxStart, uint32_t idxCount) {
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uint32_t accessorIdx = static_cast<uint32_t>(accessors.size());
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accessors.push_back({
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{"bufferView", 3},
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{"byteOffset", idxStart * 4},
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{"componentType", 5125}, // UNSIGNED_INT
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{"count", idxCount},
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{"type", "SCALAR"}
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});
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primitives.push_back({
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{"attributes", {{"POSITION", 0}, {"NORMAL", 1}, {"TEXCOORD_0", 2}}},
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{"indices", accessorIdx},
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{"mode", 4} // TRIANGLES
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});
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};
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if (wom.batches.empty()) {
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addPrimitive(0, iCount);
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} else {
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for (const auto& b : wom.batches) {
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addPrimitive(b.indexStart, b.indexCount);
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}
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}
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gj["accessors"] = accessors;
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gj["meshes"] = nlohmann::json::array({nlohmann::json{
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{"primitives", primitives}
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}});
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// Serialize JSON to bytes; pad to 4-byte boundary with spaces
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// (glTF spec requires JSON chunk padded with 0x20).
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std::string jsonStr = gj.dump();
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while (jsonStr.size() % 4 != 0) jsonStr += ' ';
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// BIN chunk pads to 4-byte boundary with zeros (already
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// satisfied since binSize = idxOff + iCount*4 and idxOff is
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// 4-byte aligned).
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uint32_t jsonLen = static_cast<uint32_t>(jsonStr.size());
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uint32_t binLen = binSize;
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uint32_t totalLen = 12 + 8 + jsonLen + 8 + binLen;
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std::ofstream out(outPath, std::ios::binary);
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if (!out) {
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std::fprintf(stderr, "Failed to open output: %s\n", outPath.c_str());
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return 1;
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}
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// Header: magic, version, total length (all little-endian uint32)
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uint32_t magic = 0x46546C67; // 'glTF'
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uint32_t version = 2;
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out.write(reinterpret_cast<const char*>(&magic), 4);
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out.write(reinterpret_cast<const char*>(&version), 4);
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out.write(reinterpret_cast<const char*>(&totalLen), 4);
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// JSON chunk header + payload
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uint32_t jsonChunkType = 0x4E4F534A; // 'JSON'
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out.write(reinterpret_cast<const char*>(&jsonLen), 4);
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out.write(reinterpret_cast<const char*>(&jsonChunkType), 4);
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out.write(jsonStr.data(), jsonLen);
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// BIN chunk header + payload
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uint32_t binChunkType = 0x004E4942; // 'BIN\0'
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out.write(reinterpret_cast<const char*>(&binLen), 4);
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out.write(reinterpret_cast<const char*>(&binChunkType), 4);
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out.write(reinterpret_cast<const char*>(bin.data()), binLen);
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out.close();
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std::printf("Exported %s.wom -> %s\n", base.c_str(), outPath.c_str());
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std::printf(" %u verts, %u tris, %zu primitive(s), %u-byte binary chunk\n",
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vCount, iCount / 3, primitives.size(), binLen);
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return 0;
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} else if (std::strcmp(argv[i], "--export-wob-obj") == 0 && i + 1 < argc) {
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// WOB is the WMO replacement; like --export-obj for WOM, this
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// bridges WOB into the universal-3D-tool ecosystem. Each WOB
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