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ifcviewer-full: console-print accumulating coplanar-patch area tool

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Adds a click-to-measure area mode triggered by Ctrl+Shift+A.  Each LMB
click expands the picked triangle into its connected coplanar patch
(BFS over shared edges, dot(normal, seed) > 0.9999); re-clicking
removes that patch; Alt+LMB skips expansion for a single triangle.
Picks across different meshes accumulate as separate patches.

ViewportWindow gains pickMeshLocalAt (screen pick → mesh-local hit
via inverse composed transform) and a tool-mode pattern mirroring
the section tool (toggleAreaTool, surfacePickedInTool signal,
areaToolToggled signal, Esc to exit).  Per-mesh adjacency is built
lazily on first pick of each mesh and dropped on tool toggle.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-05-07 12:03:22 +10:00
parent f2b655fcf6
commit 016c278748
6 changed files with 391 additions and 4 deletions
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src/ifcviewer/ViewportWindow.cpp
+53 -4
View File
@@ -1688,6 +1688,13 @@ void ViewportWindow::keyPressEvent(QKeyEvent* event) {
return;
}
}
// Esc also exits the area tool.
if (area_tool_active_
&& key == Qt::Key_Escape
&& !event->isAutoRepeat()) {
toggleAreaTool();
return;
}
QWindow::keyPressEvent(event);
}
@@ -3473,10 +3480,15 @@ void ViewportWindow::handleMouseRelease(QMouseEvent* e) {
if (active_button_ == Qt::LeftButton
&& !section_tool_active_
&& (e->pos() - last_mouse_pos_).manhattanLength() < 5) {
uint32_t id = pickObjectAt(e->pos().x(), e->pos().y());
selected_object_id_ = id;
emit objectPicked(id);
requestUpdate(); // selection highlight changed
if (area_tool_active_) {
emit surfacePickedInTool(e->pos().x(), e->pos().y(),
int(e->modifiers()));
} else {
uint32_t id = pickObjectAt(e->pos().x(), e->pos().y());
selected_object_id_ = id;
emit objectPicked(id);
requestUpdate(); // selection highlight changed
}
}
const bool was_navigating = (active_button_ == Qt::MiddleButton);
active_button_ = Qt::NoButton;
@@ -3809,3 +3821,40 @@ bool ViewportWindow::findInstance(uint32_t object_id, InstanceLookup& out) const
}
return false;
}
bool ViewportWindow::pickMeshLocalAt(int x, int y, MeshLocalPick& out) {
uint32_t obj_id = 0;
QVector3D world_pos, world_normal;
if (!pickSurfaceAt(x, y, obj_id, world_pos, world_normal)) return false;
for (const auto& kv : models_gpu_) {
const ModelGpuData& m = kv.second;
for (const InstanceCpu& inst : m.instances) {
if (inst.object_id != obj_id) continue;
using Mat4f = Eigen::Matrix<float, 4, 4, Eigen::ColMajor>;
const Eigen::Matrix4f T = Eigen::Map<const Mat4f>(inst.transform);
const Eigen::Matrix4f Ti = T.inverse();
const Eigen::Vector4f wp(world_pos.x(), world_pos.y(), world_pos.z(), 1.0f);
const Eigen::Vector4f mp = Ti * wp;
out.object_id = obj_id;
out.model_id = inst.model_id;
out.mesh_id = inst.mesh_id;
out.mesh_local[0] = mp.x();
out.mesh_local[1] = mp.y();
out.mesh_local[2] = mp.z();
out.world_pos[0] = world_pos.x();
out.world_pos[1] = world_pos.y();
out.world_pos[2] = world_pos.z();
out.world_normal[0] = world_normal.x();
out.world_normal[1] = world_normal.y();
out.world_normal[2] = world_normal.z();
return true;
}
}
return false;
}
void ViewportWindow::toggleAreaTool() {
area_tool_active_ = !area_tool_active_;
emit areaToolToggled(area_tool_active_);
}