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ifcviewer-full: volume tool with HUD + per-object labels

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Mirrors the Area tool's display: HUD shows total volume + object count,
each selected object gets a label at its world-AABB centroid showing
its individual volume.  Gated behind ToolMode::Volume (Ctrl+Shift+V) so
it stays out of the way until invoked.

Volume is a passive tool — selection works as in None (multi-select,
modifier toggle, box-select all keep working).  Area / Length still
intercept clicks through surfacePickedInTool.

Adds volumesPerObject() reusing the same mesh-cached readback path as
volumeOfObjects, so the per-object split costs no extra GL readbacks.
computeObjectAabb is promoted to public for the centroid lookup.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-05-10 08:45:08 +10:00
parent bba2f30816
commit 0a297babea
6 changed files with 124 additions and 16 deletions
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src/ifcviewer-full/Measurement.cpp
+35
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@@ -94,6 +94,41 @@ double volumeOfObjects(ViewportWindow& vp,
return total;
}
std::vector<std::pair<uint32_t, double>>
volumesPerObject(ViewportWindow& vp,
const std::vector<uint32_t>& object_ids) {
std::vector<std::pair<uint32_t, double>> out;
if (object_ids.empty()) return out;
out.reserve(object_ids.size());
// Cache the local-frame volume per unique (model_id, mesh_id) so each
// mesh is read back at most once even when many instances share it
// (common for repeated families like windows / columns).
std::unordered_map<uint64_t, double> mesh_vol_local;
mesh_vol_local.reserve(object_ids.size());
ViewportWindow::MeshTriangles tris;
for (uint32_t oid : object_ids) {
ViewportWindow::InstanceLookup lk;
if (!vp.findInstance(oid, lk)) continue;
const uint64_t key = (uint64_t(lk.model_id) << 32) | lk.mesh_id;
auto it = mesh_vol_local.find(key);
double v_local = 0.0;
if (it == mesh_vol_local.end()) {
if (vp.readbackMeshTriangles(lk.model_id, lk.mesh_id, tris)) {
v_local = meshLocalVolume(tris);
}
mesh_vol_local.emplace(key, v_local);
} else {
v_local = it->second;
}
const double det = std::abs(det3(lk.placement_transformation));
out.emplace_back(oid, v_local * det);
}
return out;
}
namespace {
// edge_key: undirected edge between two mesh-local vertex indices.