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Tools

Select a tool from the main toolbar or use its keyboard shortcut. Selecting another tool deactivates the previous one.

Selection tools

Brush, Eraser, and Lasso require an active selection. Choose a selection in the scene tree before editing faces.

Brush (B)

Hold the left mouse button and move over the model to add faces to the active selection. Size changes the spherical selector radius. Use [ and ] for stepwise size changes.

Eraser (E)

Hold the left mouse button and move over selected faces to remove them. Eraser shares the Brush Size control.

Lasso (L)

Draw a freehand polygon around the faces to add. Its options are:

  • Pixel precision: higher values sample the drawn polygon more frequently and cost more processing time.
  • Normal threshold: controls how closely a face must point toward the camera. -1 is most tolerant and +1 is most restrictive.
  • Select occluded faces: includes qualifying faces hidden behind visible geometry.

Subtractive use

The right mouse button reverses the active selection action: Brush removes, Eraser adds, and Lasso subtracts. This applies only while an active selection exists.

No Tool (N)

Deactivates all editing tools and restores normal scene navigation.

Point tools

Measure (M)

Choose a distance mode, then select two surface points on the same model. THOTH opens a details dialog before it saves the measurement. See Measurements.

Semantic Annotation (A)

Select one surface point, complete the details dialog, and save. See Semantic annotations.

Temporarily navigate

Editing tools take control of pointer input. Hold Space to pause the active tool and navigate the scene; release it to resume. Starting navigation clears an unfinished lasso, measurement, or semantic-annotation point.