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feat(editor): add --gen-mesh-tube hollow cylinder/pipe primitive

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Hollow cylinder along the Y axis with separate outer wall, inner
wall (normals pointing inward + reversed winding so the inside
faces the viewer when looking through), and two annular caps. UV
coords on the caps map the inner ring proportionally so a radial
texture stays continuous across both rings.

Useful for railings, fence posts, pipes, hollow logs, ring towers
— anywhere a solid cylinder would feel wrong because you should
be able to see through the middle.

Args: <wom-base> [outerR] [innerR] [height] [segments]
Defaults: 1.0 / 0.7 / 2.0 / 24. Validates innerR < outerR so the
walls don't intersect.

Verified: defaults produce 200 verts / 192 tris (4 surfaces × 48
quads × 2 tris = 384, halved by per-segment-pair indexing → 192).
Brings the procedural primitive set to 10 (cube/plane/sphere/
cylinder/torus/cone/ramp/grid/disc/tube + stairs + heightmap).
This commit is contained in:
Kelsi 2026-05-07 18:01:42 -07:00
parent 5e4a5f350f
commit 135b89299b
1 changed files with 178 additions and 0 deletions
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178
tools/editor/main.cpp
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@ -551,6 +551,8 @@ static void printUsage(const char* argv0) {
std::printf(" Subdivided flat plane on XY (NxN cells, 2N² triangles); useful for LOD demos\n");
std::printf(" --gen-mesh-disc <wom-base> [radius] [segments]\n");
std::printf(" Flat circular disc on XY centered at origin (default radius 1.0, 32 segments)\n");
std::printf(" --gen-mesh-tube <wom-base> [outerRadius] [innerRadius] [height] [segments]\n");
std::printf(" Hollow cylinder/pipe along Y axis (default 1.0/0.7/2.0, 24 segments)\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");
std::printf(" --gen-mesh-from-heightmap <wom-base> <heightmap.png> [scaleXZ] [scaleY]\n");
@ -1027,6 +1029,7 @@ int main(int argc, char* argv[]) {
"--export-data-tree-md", "--gen-texture", "--gen-mesh", "--gen-mesh-textured",
"--add-texture-to-mesh", "--add-texture-to-zone",
"--gen-mesh-stairs", "--gen-mesh-grid", "--gen-mesh-disc",
"--gen-mesh-tube",
"--gen-texture-gradient",
"--gen-mesh-from-heightmap", "--export-mesh-heightmap",
"--displace-mesh",
@ -18326,6 +18329,181 @@ int main(int argc, char* argv[]) {
wom.vertices.size(), segments + 1);
std::printf(" triangles : %zu\n", wom.indices.size() / 3);
return 0;
} else if (std::strcmp(argv[i], "--gen-mesh-tube") == 0 && i + 1 < argc) {
// Hollow cylinder along Y axis. Outer + inner walls + top
// and bottom annular caps. Useful for railings, fence
// posts, pipes, hollow logs, ring towers — anywhere a
// solid cylinder would feel wrong because you should be
// able to see through the middle.
std::string womBase = argv[++i];
float outerR = 1.0f;
float innerR = 0.7f;
float height = 2.0f;
int segments = 24;
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { outerR = std::stof(argv[++i]); } catch (...) {}
}
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { innerR = 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 { segments = std::stoi(argv[++i]); } catch (...) {}
}
if (outerR <= 0 || innerR <= 0 || innerR >= outerR ||
height <= 0 || segments < 3 || segments > 1024) {
std::fprintf(stderr,
"gen-mesh-tube: 0 < innerR < outerR, height > 0, segments 3..1024\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;
float h = height * 0.5f;
auto addV = [&](float x, float y, float z,
float nx, float ny, float nz,
float u, float v) {
wowee::pipeline::WoweeModel::Vertex vtx;
vtx.position = glm::vec3(x, y, z);
vtx.normal = glm::vec3(nx, ny, nz);
vtx.texCoord = glm::vec2(u, v);
wom.vertices.push_back(vtx);
return static_cast<uint32_t>(wom.vertices.size() - 1);
};
// Outer wall: 2 rows × (segments+1) verts, normals point
// radially outward.
uint32_t outerStart = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(outerR * ca, -h, outerR * sa, ca, 0, sa, u, 0);
addV(outerR * ca, h, outerR * sa, ca, 0, sa, u, 1);
}
for (int sg = 0; sg < segments; ++sg) {
uint32_t a = outerStart + sg * 2;
uint32_t b = a + 1, c = a + 2, d = a + 3;
wom.indices.push_back(a);
wom.indices.push_back(c);
wom.indices.push_back(b);
wom.indices.push_back(b);
wom.indices.push_back(c);
wom.indices.push_back(d);
}
// Inner wall: normals point radially inward, winding
// reversed so the inside-facing surfaces face the viewer
// when looking through the tube.
uint32_t innerStart = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(innerR * ca, -h, innerR * sa, -ca, 0, -sa, u, 0);
addV(innerR * ca, h, innerR * sa, -ca, 0, -sa, u, 1);
}
for (int sg = 0; sg < segments; ++sg) {
uint32_t a = innerStart + sg * 2;
uint32_t b = a + 1, c = a + 2, d = a + 3;
wom.indices.push_back(a);
wom.indices.push_back(b);
wom.indices.push_back(c);
wom.indices.push_back(b);
wom.indices.push_back(d);
wom.indices.push_back(c);
}
// Top annular cap: ring at +Y. Inner + outer ring of verts,
// quads stitched between them, normal +Y.
uint32_t topInner = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(innerR * ca, h, innerR * sa, 0, 1, 0,
0.5f + 0.5f * (innerR / outerR) * ca,
0.5f + 0.5f * (innerR / outerR) * sa);
}
uint32_t topOuter = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(outerR * ca, h, outerR * sa, 0, 1, 0,
0.5f + 0.5f * ca, 0.5f + 0.5f * sa);
}
for (int sg = 0; sg < segments; ++sg) {
uint32_t a = topInner + sg;
uint32_t b = topInner + sg + 1;
uint32_t c = topOuter + sg;
uint32_t d = topOuter + sg + 1;
wom.indices.push_back(a);
wom.indices.push_back(c);
wom.indices.push_back(b);
wom.indices.push_back(b);
wom.indices.push_back(c);
wom.indices.push_back(d);
}
// Bottom annular cap, normal -Y, winding reversed.
uint32_t botInner = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(innerR * ca, -h, innerR * sa, 0, -1, 0,
0.5f + 0.5f * (innerR / outerR) * ca,
0.5f - 0.5f * (innerR / outerR) * sa);
}
uint32_t botOuter = static_cast<uint32_t>(wom.vertices.size());
for (int sg = 0; sg <= segments; ++sg) {
float u = static_cast<float>(sg) / segments;
float ang = u * 2.0f * 3.14159265358979f;
float ca = std::cos(ang), sa = std::sin(ang);
addV(outerR * ca, -h, outerR * sa, 0, -1, 0,
0.5f + 0.5f * ca, 0.5f - 0.5f * sa);
}
for (int sg = 0; sg < segments; ++sg) {
uint32_t a = botInner + sg;
uint32_t b = botInner + sg + 1;
uint32_t c = botOuter + sg;
uint32_t d = botOuter + sg + 1;
wom.indices.push_back(a);
wom.indices.push_back(b);
wom.indices.push_back(c);
wom.indices.push_back(b);
wom.indices.push_back(d);
wom.indices.push_back(c);
}
wom.boundMin = glm::vec3(-outerR, -h, -outerR);
wom.boundMax = glm::vec3( outerR, h, outerR);
wom.boundRadius = glm::length(wom.boundMax - wom.boundMin) * 0.5f;
wowee::pipeline::WoweeModel::Batch b;
b.indexStart = 0;
b.indexCount = static_cast<uint32_t>(wom.indices.size());
b.textureIndex = 0;
b.blendMode = 0;
b.flags = 0;
wom.batches.push_back(b);
wom.texturePaths.push_back("");
std::filesystem::path womPath(womBase);
std::filesystem::create_directories(womPath.parent_path());
if (!wowee::pipeline::WoweeModelLoader::save(wom, womBase)) {
std::fprintf(stderr,
"gen-mesh-tube: failed to save %s.wom\n", womBase.c_str());
return 1;
}
std::printf("Wrote %s.wom\n", womBase.c_str());
std::printf(" outer R : %.3f\n", outerR);
std::printf(" inner R : %.3f\n", innerR);
std::printf(" height : %.3f\n", height);
std::printf(" segments : %d\n", segments);
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