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feat(editor): add --gen-mesh-tower castle tower primitive

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Procedural round castle tower: solid cylindrical shaft with
crenellated battlements ringing the top — alternating raised
merlons and gaps. Each merlon is an extruded arc segment
sitting on the rim. Pass battlementH=0 for a smooth-topped
tower.

Defaults: radius=1.5, height=8, battlements=8, battlementH=0.5.
Useful for keeps, watchtowers, perimeter walls. Brings the
procedural mesh primitive set to 19.
This commit is contained in:
Kelsi 2026-05-08 05:41:29 -07:00
parent 0525c07e1a
commit 654436c7cf
1 changed files with 154 additions and 0 deletions
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154
tools/editor/main.cpp
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@ -580,6 +580,8 @@ static void printUsage(const char* argv0) {
std::printf(" Fluted classical column with concave flutes + flared cap/base (default 12 flutes)\n");
std::printf(" --gen-mesh-bridge <wom-base> [length] [width] [planks] [railHeight]\n");
std::printf(" Plank bridge with two side rails (default 6 planks across, rails on)\n");
std::printf(" --gen-mesh-tower <wom-base> [radius] [height] [battlements] [battlementH]\n");
std::printf(" Round castle tower with crenellated battlements (default 8 teeth, 0.5m tall)\n");
std::printf(" Procedural tree: cylindrical trunk + spherical foliage (default 0.1/2.0/0.7)\n");
std::printf(" --displace-mesh <wom-base> <heightmap.png> [scale]\n");
std::printf(" Offset each vertex along its normal by heightmap brightness × scale (default 1.0)\n");
@ -1094,6 +1096,7 @@ int main(int argc, char* argv[]) {
"--gen-mesh-tube", "--gen-mesh-capsule", "--gen-mesh-arch",
"--gen-mesh-pyramid", "--gen-mesh-fence", "--gen-mesh-tree",
"--gen-mesh-rock", "--gen-mesh-pillar", "--gen-mesh-bridge",
"--gen-mesh-tower",
"--gen-texture-gradient",
"--gen-mesh-from-heightmap", "--export-mesh-heightmap",
"--displace-mesh",
@ -21804,6 +21807,157 @@ int main(int argc, char* argv[]) {
std::printf(" vertices : %zu\n", wom.vertices.size());
std::printf(" triangles : %zu\n", wom.indices.size() / 3);
return 0;
} else if (std::strcmp(argv[i], "--gen-mesh-tower") == 0 && i + 1 < argc) {
// Procedural castle tower. Solid cylindrical shaft with
// crenellated battlements ringing the top: alternating
// raised "merlons" and gaps. Each merlon is a thin
// angular wedge sitting on the top rim. Useful for
// keeps, watchtowers, perimeter walls.
//
// The 19th procedural mesh primitive.
std::string womBase = argv[++i];
float radius = 1.5f;
float height = 8.0f;
int battlements = 8; // merlons around the rim
float battlementH = 0.5f;
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { radius = std::stof(argv[++i]); } catch (...) {}
}
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { height = std::stof(argv[++i]); } catch (...) {}
}
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { battlements = std::stoi(argv[++i]); } catch (...) {}
}
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { battlementH = std::stof(argv[++i]); } catch (...) {}
}
if (radius <= 0 || height <= 0 ||
battlements < 4 || battlements > 64 ||
battlementH < 0 || battlementH > 4.0f) {
std::fprintf(stderr,
"gen-mesh-tower: radius>0, height>0, battlements 4..64, bH 0..4\n");
return 1;
}
if (womBase.size() >= 4 &&
womBase.substr(womBase.size() - 4) == ".wom") {
womBase = womBase.substr(0, womBase.size() - 4);
}
wowee::pipeline::WoweeModel wom;
wom.name = std::filesystem::path(womBase).stem().string();
wom.version = 3;
const float pi = 3.14159265358979f;
const int radSegs = std::max(24, battlements * 4);
auto addV = [&](glm::vec3 p, glm::vec3 n, glm::vec2 uv) -> uint32_t {
wowee::pipeline::WoweeModel::Vertex vtx;
vtx.position = p; vtx.normal = n; vtx.texCoord = uv;
wom.vertices.push_back(vtx);
return static_cast<uint32_t>(wom.vertices.size() - 1);
};
// Cylinder shaft: side ring at y=0 and y=height.
uint32_t botRing = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= radSegs; ++sg) {
float u = static_cast<float>(sg) / radSegs;
float ang = u * 2.0f * pi;
glm::vec3 p(radius * std::cos(ang), 0, radius * std::sin(ang));
glm::vec3 n(std::cos(ang), 0, std::sin(ang));
addV(p, n, glm::vec2(u, 0));
}
uint32_t topRing = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= radSegs; ++sg) {
float u = static_cast<float>(sg) / radSegs;
float ang = u * 2.0f * pi;
glm::vec3 p(radius * std::cos(ang), height, radius * std::sin(ang));
glm::vec3 n(std::cos(ang), 0, std::sin(ang));
addV(p, n, glm::vec2(u, 1));
}
for (int sg = 0; sg < radSegs; ++sg) {
wom.indices.insert(wom.indices.end(), {
botRing + sg, topRing + sg, botRing + sg + 1,
botRing + sg + 1, topRing + sg, topRing + sg + 1
});
}
// Top cap (fan toward upward-facing center).
uint32_t topCenter = addV({0, height, 0}, {0, 1, 0}, {0.5f, 0.5f});
for (int sg = 0; sg < radSegs; ++sg) {
wom.indices.insert(wom.indices.end(),
{ topCenter, topRing + sg, topRing + sg + 1 });
}
// Bottom cap (fan toward downward-facing center).
uint32_t botCenter = addV({0, 0, 0}, {0, -1, 0}, {0.5f, 0.5f});
for (int sg = 0; sg < radSegs; ++sg) {
wom.indices.insert(wom.indices.end(),
{ botCenter, botRing + sg + 1, botRing + sg });
}
// Battlements: thin curved blocks around the top rim,
// half the slots filled (alternating merlon/gap).
// Each merlon is approximated by an extruded arc segment
// at the wall radius extending outward slightly.
if (battlementH > 0.0f) {
int merlonSpan = radSegs / battlements;
int merlonHalf = std::max(1, merlonSpan / 2);
float outerR = radius * 1.05f;
float innerR = radius * 0.95f;
for (int b = 0; b < battlements; ++b) {
int startSeg = b * merlonSpan;
// Build 8-vert box-like segment between angles
// covering merlonHalf slots (so half the rim is
// filled, forming the merlon/gap pattern).
float ang0 = 2.0f * pi * static_cast<float>(startSeg) / radSegs;
float ang1 = 2.0f * pi * static_cast<float>(startSeg + merlonHalf) / radSegs;
glm::vec3 outer0(outerR * std::cos(ang0), 0, outerR * std::sin(ang0));
glm::vec3 outer1(outerR * std::cos(ang1), 0, outerR * std::sin(ang1));
glm::vec3 inner0(innerR * std::cos(ang0), 0, innerR * std::sin(ang0));
glm::vec3 inner1(innerR * std::cos(ang1), 0, innerR * std::sin(ang1));
glm::vec3 yLow(0, height, 0);
glm::vec3 yHigh(0, height + battlementH, 0);
glm::vec3 norm = glm::normalize(
outer0 + outer1 - inner0 - inner1);
auto V = [&](glm::vec3 p, glm::vec3 n) {
return addV(p, n, {0, 0});
};
// 8 verts: 4 corners × 2 heights
uint32_t bbl = V(outer0 + yLow, norm); // bot outer left
uint32_t bbr = V(outer1 + yLow, norm);
uint32_t btl = V(outer0 + yHigh, norm); // top outer left
uint32_t btr = V(outer1 + yHigh, norm);
uint32_t ibl = V(inner0 + yLow, -norm); // bot inner left
uint32_t ibr = V(inner1 + yLow, -norm);
uint32_t itl = V(inner0 + yHigh, -norm); // top inner left
uint32_t itr = V(inner1 + yHigh, -norm);
// outer face
wom.indices.insert(wom.indices.end(), {bbl, btl, bbr, bbr, btl, btr});
// inner face
wom.indices.insert(wom.indices.end(), {ibr, itr, ibl, ibl, itr, itl});
// top face
wom.indices.insert(wom.indices.end(), {btl, itl, btr, btr, itl, itr});
// left and right end caps
wom.indices.insert(wom.indices.end(), {bbl, ibl, btl, btl, ibl, itl});
wom.indices.insert(wom.indices.end(), {bbr, btr, ibr, ibr, btr, itr});
}
}
wowee::pipeline::WoweeModel::Batch batch;
batch.indexStart = 0;
batch.indexCount = static_cast<uint32_t>(wom.indices.size());
batch.textureIndex = 0;
wom.batches.push_back(batch);
float maxY = height + battlementH;
float maxR = radius * 1.05f;
wom.boundMin = glm::vec3(-maxR, 0, -maxR);
wom.boundMax = glm::vec3( maxR, maxY, maxR);
if (!wowee::pipeline::WoweeModelLoader::save(wom, womBase)) {
std::fprintf(stderr,
"gen-mesh-tower: failed to save %s.wom\n", womBase.c_str());
return 1;
}
std::printf("Wrote %s.wom\n", womBase.c_str());
std::printf(" radius : %.3f\n", radius);
std::printf(" height : %.3f\n", height);
std::printf(" battlements : %d (%.3fm tall)\n",
battlements, battlementH);
std::printf(" vertices : %zu\n", wom.vertices.size());
std::printf(" triangles : %zu\n", wom.indices.size() / 3);
return 0;
} else if (std::strcmp(argv[i], "--displace-mesh") == 0 && i + 2 < argc) {
// Displaces each vertex along its current normal by the
// heightmap brightness × scale. UVs determine where each