Known Issues and Workarounds

Effective density/volume fraction is an estimate. When using a constant density field, actual density may differ from target by approximately +/- 10%.

Known algorithm limitation. Not expected to be resolved.

Account for this variance when setting density targets for structural or print-weight specifications. Validate by measuring output geometry volume in your CAD tool.

Jobs exceeding 45 minutes are automatically halted with an error message.

Platform limit. Will not be removed.

Increase DRT to reduce computation time. Use Single Surface output during iteration. Only run Production quality Solid Surface for the final export.

Very low DRT values on large envelopes exceed the cloud memory ceiling.

Platform limit. Will not be removed.

Keep DRT at 0.4 mm or higher during iteration. Split large envelopes into sub-volumes if memory errors persist.

After assigning field points, colour-coded labels do not appear in the Rhino viewport.

Intermittent display issue.

Restart Rhino. Use the Inspector panel to verify field points are correctly assigned even when labels are not visible.

After running the installer, Spherene commands do not appear in the Rhino command autocomplete.

Occurs when Rhino was open during installation.

Close Rhino fully and reopen. If commands still do not appear, re-run the installer with Rhino closed and confirm the plugin appears in Tools > Options > Plugins.

Spherene components in a saved .gh file appear pink when opened on a different machine or after a plugin update.

Occurs when plugin version differs from the version used to create the file, or plugin is not installed.

Confirm the plugin is installed and activated. Save, close, and reopen the file. If components remain pink, delete and re-place them from the Spherene tab.

After assigning a field in Fusion, colour-coded labels do not appear in the viewport.

Known display issue related to Active Component Visibility setting.

Click the Refresh button in the Utilities section of the Spherene toolbar. If still not visible: go to Fusion Preferences > Design > Assemblies, uncheck Active Component Visibility, click OK, then Refresh.

Using a non-Hybrid Design template when creating a new Fusion file can cause unexpected behaviour with the Spherene plugin.

Behaviour introduced with Fusion January 2026 template update.

Always create new Fusion projects using the Hybrid Design template. For existing files, recreate the project in a new Hybrid Design file if unexpected behaviour occurs.

After computing Single Surface output, nTop displays an "open mesh" warning on the result.

Known nTop visualisation artefact for zero-thickness meshes. Not a geometry error.

Ignore if working with Single Surface for design review. For downstream use, thicken the surface or re-run with Solid Surface output.

The Create Spherene block recomputes every time any input attribute changes, consuming credits.

Expected nTop Auto Run Mode behaviour. Not a bug.

Right-click the block header immediately after adding it and select Manual Run Mode. Required each time a new Create Spherene block is added.

Large mesh or STEP files (over 200 MB) may take several minutes to import. The interface remains responsive but shows a background import indicator.

Expected behaviour for large files.

Wait for the import to complete before configuring fields or triggering compute. The pre-flight estimator will not be available until the import finishes.

After switching units in the platform settings, some labels in the viewport or field configuration panel may not update immediately.

Known display issue. Fix in progress.

Refresh the browser page after switching units. All values and labels will update correctly after reload.

The Undo/Redo system covers field and modifier configuration changes, but does not undo a completed computation or its result.

By design. Compute results are permanent once generated.

Remove unwanted results manually from the Results panel. Use descriptive Part Names to track iterations.