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T-H2 — Point-to-point measurement in the viewer #324
Description
Epic: Epic H — Real-world scale & measurement tools
Priority: P2
Context
Lets a user verify a mesh's real-world dimensions directly in the viewer, once it's calibrated (T-H1).
Scope
- Measurement tool: two clicks on the mesh (BVH raycast, already in place) → distance shown in real units if the scale is calibrated (T-H1), otherwise in mesh units.
Acceptance criteria
Clicking two points on a calibrated mesh shows the real distance in cm/mm.
Depends on: T-H1
From ROADMAP_0.5.md.
Activity
[-]T-H2 — Mesure point-à-point dans le viewer[/-][+]T-H2 — Point-to-point measurement in the viewer[/+]cadprobs-a11y commentedon Oct 8, 2026
For a calibrated mesh, I would keep the displayed unit tied to the calibration state and make the uncalibrated case explicit as “mesh units.” For curved geometry, it also helps to distinguish the hit-point chord distance from an edge or feature length, otherwise users may read the result as a manufacturing dimension.
A concise reference for STEP measurement terminology is the CADProps STEP measurement guide. Disclosure: I contribute to CADProps. It is a separate hosted tool that processes uploaded files on its servers, not a dependency of Modly.