T-H2 — Point-to-point measurement in the viewer

[lightningpixel]

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

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From ROADMAP_0.5.md.