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feat(editor): add --gen-mesh-coffin hexagonal-prism primitive
38th procedural mesh: classic 6-sided coffin with the narrow-head / wide-shoulder / tapered-foot top-down profile that's instantly recognizable from any angle. Built as 6 side quads + top lid fan + bottom panel fan, all with face-shared normals so it shades cleanly under any lighting. Pairs with --gen-mesh-grave for graveyard set dressing. Defaults to 2.0×0.8×0.6 (length × shoulder-width × height).
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Kelsi
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3 changed files with 143 additions and 1 deletions
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@ -4518,6 +4518,143 @@ int handleThrone(int& i, int argc, char** argv) {
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return 0;
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}
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int handleCoffin(int& i, int argc, char** argv) {
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// Coffin: classic 6-sided "hexagonal" prism with the
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// characteristic narrow-head / wide-shoulder / tapered-foot
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// top-down profile that reads as a coffin from any angle.
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// Six side faces + top lid + bottom panel — face-shared
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// normals via separate vertex sets per face. The 38th
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// procedural mesh primitive — useful for graveyard set
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// dressing alongside --gen-mesh-grave.
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std::string womBase = argv[++i];
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float length = 2.0f; // along Z
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float width = 0.8f; // shoulder width along X
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float height = 0.6f; // along Y
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { length = std::stof(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { width = std::stof(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { height = std::stof(argv[++i]); } catch (...) {}
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}
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if (length <= 0 || width <= 0 || height <= 0) {
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std::fprintf(stderr,
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"gen-mesh-coffin: length/width/height must be > 0\n");
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return 1;
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}
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if (womBase.size() >= 4 &&
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womBase.substr(womBase.size() - 4) == ".wom") {
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womBase = womBase.substr(0, womBase.size() - 4);
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}
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wowee::pipeline::WoweeModel wom;
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wom.name = std::filesystem::path(womBase).stem().string();
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wom.version = 3;
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// Top-down hexagonal coffin profile (CCW from head looking
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// down +Y). Head end is narrow, shoulder is widest, feet
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// taper to a narrow toe — the canonical "casket" silhouette.
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float hL = length * 0.5f;
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float hW = width * 0.5f;
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glm::vec2 ring[6] = {
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{ 0.0f, hL }, // p0 head tip
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{-hW, hL * 0.6f }, // p1 left shoulder (widest)
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{-hW * 0.8f, -hL * 0.6f }, // p2 left hip
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{ 0.0f, -hL }, // p3 foot tip
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{ hW * 0.8f, -hL * 0.6f }, // p4 right hip
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{ hW, hL * 0.6f }, // p5 right shoulder
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};
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auto addQuad = [&](glm::vec3 a, glm::vec3 b, glm::vec3 c, glm::vec3 d,
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glm::vec3 n) {
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uint32_t base = static_cast<uint32_t>(wom.vertices.size());
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auto push = [&](glm::vec3 p, float u, float v) {
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wowee::pipeline::WoweeModel::Vertex vtx;
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vtx.position = p; vtx.normal = n; vtx.texCoord = {u, v};
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wom.vertices.push_back(vtx);
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};
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push(a, 0, 0);
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push(b, 1, 0);
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push(c, 1, 1);
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push(d, 0, 1);
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wom.indices.insert(wom.indices.end(),
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{base, base + 1, base + 2, base, base + 2, base + 3});
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};
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// Six side faces — each a quad from bottom-edge to top-edge
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// of one segment of the hexagon. Normal is the outward
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// perpendicular to the side edge in the XZ plane.
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for (int s = 0; s < 6; ++s) {
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const glm::vec2& a = ring[s];
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const glm::vec2& b = ring[(s + 1) % 6];
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glm::vec3 bot0(a.x, 0.0f, a.y);
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glm::vec3 bot1(b.x, 0.0f, b.y);
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glm::vec3 top1(b.x, height, b.y);
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glm::vec3 top0(a.x, height, a.y);
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// Outward normal: 90° CW rotation of edge vector in XZ
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// (since vertices wind CCW looking down, outward is +X
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// when edge goes -Z, i.e. swap & negate one component).
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glm::vec2 edge = b - a;
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glm::vec3 n(edge.y, 0.0f, -edge.x);
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n = glm::normalize(n);
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addQuad(bot0, bot1, top1, top0, n);
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}
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// Top lid: fan of 4 triangles from p0, all sharing +Y normal.
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{
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glm::vec3 normal(0.0f, 1.0f, 0.0f);
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uint32_t base = static_cast<uint32_t>(wom.vertices.size());
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for (int v = 0; v < 6; ++v) {
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wowee::pipeline::WoweeModel::Vertex vtx;
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vtx.position = glm::vec3(ring[v].x, height, ring[v].y);
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vtx.normal = normal;
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// Cheap planar UV from top-down ring coords.
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vtx.texCoord = { ring[v].x / width + 0.5f,
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ring[v].y / length + 0.5f };
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wom.vertices.push_back(vtx);
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}
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for (int t = 1; t < 5; ++t) {
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wom.indices.insert(wom.indices.end(),
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{base, base + static_cast<uint32_t>(t),
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base + static_cast<uint32_t>(t + 1)});
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}
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}
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// Bottom panel: same fan but reversed winding for -Y normal.
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{
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glm::vec3 normal(0.0f, -1.0f, 0.0f);
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uint32_t base = static_cast<uint32_t>(wom.vertices.size());
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for (int v = 0; v < 6; ++v) {
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wowee::pipeline::WoweeModel::Vertex vtx;
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vtx.position = glm::vec3(ring[v].x, 0.0f, ring[v].y);
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vtx.normal = normal;
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vtx.texCoord = { ring[v].x / width + 0.5f,
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ring[v].y / length + 0.5f };
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wom.vertices.push_back(vtx);
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}
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for (int t = 1; t < 5; ++t) {
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wom.indices.insert(wom.indices.end(),
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{base, base + static_cast<uint32_t>(t + 1),
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base + static_cast<uint32_t>(t)});
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}
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}
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wowee::pipeline::WoweeModel::Batch batch;
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batch.indexStart = 0;
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batch.indexCount = static_cast<uint32_t>(wom.indices.size());
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batch.textureIndex = 0;
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wom.batches.push_back(batch);
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wom.boundMin = glm::vec3(-hW, 0.0f, -hL);
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wom.boundMax = glm::vec3( hW, height, hL);
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if (!wowee::pipeline::WoweeModelLoader::save(wom, womBase)) {
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std::fprintf(stderr,
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"gen-mesh-coffin: failed to save %s.wom\n", womBase.c_str());
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return 1;
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}
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std::printf("Wrote %s.wom\n", womBase.c_str());
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std::printf(" length : %.3f\n", length);
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std::printf(" width : %.3f (shoulder)\n", width);
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std::printf(" height : %.3f\n", height);
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std::printf(" vertices : %zu\n", wom.vertices.size());
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std::printf(" triangles : %zu\n", wom.indices.size() / 3);
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return 0;
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}
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} // namespace
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bool handleGenMesh(int& i, int argc, char** argv, int& outRc) {
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@ -4624,6 +4761,9 @@ bool handleGenMesh(int& i, int argc, char** argv, int& outRc) {
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if (std::strcmp(argv[i], "--gen-mesh-throne") == 0 && i + 1 < argc) {
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outRc = handleThrone(i, argc, argv); return true;
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}
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if (std::strcmp(argv[i], "--gen-mesh-coffin") == 0 && i + 1 < argc) {
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outRc = handleCoffin(i, argc, argv); return true;
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}
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return false;
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}
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