ViewportWindow trades the area_tool_active_ bool for an enum ToolMode
{None, Area, Length}; the existing surfacePickedInTool signal carries
both, the app dispatches on toolMode(). Esc exits any active tool;
Backspace/Delete in length mode emits toolBackspacePressed which the
length tool uses to remove the last point.
LengthMeasurement collects clicked world-space points and adapts the
readout: 2pt → distance + axis-aligned ΔX/ΔY/ΔZ, 3pt → angle at the
middle vertex + triangle area, 4+pt → best-fit-plane PCA + shoelace
when planar (RMS plane distance / bbox diag < 1e-3) else fan
triangulation, with the chosen method labelled in the readout. Per-
segment lengths float at each midpoint.
OverlayRenderer grows three new pipelines to support this:
- point sprite shader: gl_PointCoord-based outlined disc with
fwidth-smoothed inner/stroke bands, a single draw call.
- line shader: CPU-expand each segment to 6 verts carrying both
endpoints + (side, along) corner index; vertex shader computes
the screen-space perpendicular and offsets accordingly. Real
outlined lines independent of the driver's glLineWidth clamp.
- screen-space rect shader: HUD + label backgrounds drawn as raw
GL quads in NDC. QPainter::fillRect on QOpenGLPaintDevice was
silently dropping fills across drivers; bypassing it entirely
via this shader makes backgrounds reliable. Cull-face is also
explicitly disabled here — GL_TRIANGLES respects it but the
line/point primitives don't, so this was the one path needing
the fix.
setOverlayLines / setOverlayPoints take an inner color, an outline
color, and an extra-pixels-per-side stroke amount. Lines + points
draw with GL_ALWAYS so measurement annotations stay visible through
geometry; highlight tris stay depth-aware (GL_LEQUAL) so area
shading still tints the surface in place.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
New OverlayRenderer module owns every client-supplied overlay primitive
drawn after the main pass: tinted, depth-aware highlight triangles via
its own GL shader, and top-left HUD text via QPainter on a
QOpenGLPaintDevice. Public surface on ViewportWindow is just two
forwarders (setHighlightTriangles, setHudText).
ViewportWindow's MeshLocalPick now exposes the instance's composed
transform so consumers can map mesh-local geometry back to world
space without re-querying. AreaMeasurement uses both: its selection
key is now (object_id, tri) so per-instance highlighting works for
two distinct walls sharing a mesh, and on every pick it rebuilds the
world-space tri list and the HUD readout.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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>
Adds neutral primitives on ViewportWindow (readbackMeshTriangles,
findInstance) so consumers can compute per-object geometry queries
without the library retaining a CPU triangle copy. Measurement.cpp in
ifcviewer-full uses them to sum signed-tetrahedra in mesh-local space,
weighted by |det(placement_3x3)| per instance for mapped-item scaling.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Dion Moult