VoxelSpy
GitHub
Private comparison

Start with two models

Choose a trusted baseline and a candidate revision. Import and analysis run in a dedicated browser worker; model data is not uploaded.

Optional

Reopen a saved session

Already saved a comparison as a .voxelspy file? Open it to restore the workbench directly, with the same models and analysis result, without re-running the analysis.

Step 01

Choose source files

Select two supported files to compare immediately using common millimetre and right-handed Z-up defaults. If a source uses a different frame, adjust its Expert settings first.

Baseline
Expert settings

Change these only when the source uses a different unit or up-axis. The selected values are recorded with the comparison.

Choose a local model file.

Candidate
Expert settings

Change these only when the source uses a different unit or up-axis. The selected values are recorded with the comparison.

Choose a local model file.

Analysis method

Sampled surface distance

Approximate, tessellation-dependent comparison at a 0.1 mm distance tolerance. Preconditions and uncertainty remain attached to the result.

This is a ceiling, not preallocated memory. Raising it also gives the local worker more compute time; large settings may slow or destabilize this tab. The starting value above is a recommendation for this device, not a hard limit -- move the slider to use any allowance in its range.
Optional

Align candidate to baseline

Off by default. Alignment is an estimate you review and explicitly accept — VoxelSpy never auto-aligns geometry. Enter at least 3 correspondence point pairs (a point on the candidate, in its own local frame, paired with its intended counterpart on the baseline, in the baseline’s own frame), then optionally refine the result with iterative-closest-point using the already-selected geometry. Results computed with an accepted alignment describe how the aligned geometry compares — not the candidate’s original position.

Choose both source files

Local boundary: source bytes, normalized geometry, and analysis remain in this browser. No network-backed model service is part of this workflow.