Voxels Path finds a route between two voxels of a volume and draws it as a line; its tooltip reads "Show optimal path between two voxels." The route is not the straight line: it is the path whose voxel values cost the least, so it follows a structure, for example a channel or a dense wall, from one point to another.
Build a Path
- Select exactly one voxel object in the Scene tree (see Voxels).
- Click CT › Voxels Path. The panel opens with Voxel 1 and Voxel 2 set to None.
- Click the surface of the volume in the 3D view: the point becomes Voxel 1. Click a second point: it becomes Voxel 2, and the path is built at once as a black line. The next clicks replace Voxel 1 and Voxel 2 in turn.
- To try another metric, change Metric Type and click Rebuild.
Panel
| Control | What it does | Default |
|---|---|---|
| Voxel 1, Voxel 2 | The start and end voxels as voxel IDs. You can type or drag an ID instead of clicking. The ID counts voxels row by row: x + y × (number of voxels along X) + z × (number of voxels along X) × (number of voxels along Y) | None |
| Metric Type: Difference | A step costs more the more the two voxels differ from the values at the start and end voxels, so the path stays in material whose values are close to those at its ends | Selected |
| Metric Type: Exponent | A step costs e^(modifier × (sum of the two voxel values)). With a negative Exponent modifier the path prefers high values (bright, dense voxels); with a positive one it prefers low values | — |
| Exponent modifier | Shown for Exponent only | −1 |
| Reset | Clears both voxels and the path | — |
| Rebuild | Builds the path again with the current voxels and metric | — |
| Build four | Builds four paths, each kept in a different quarter of the space around the line between the two voxels, so you see alternative routes on different sides | — |
Rebuild and Build four appear only when both voxels are set. The search stays near the two voxels: voxels farther from their midpoint than about 0.9 of the distance between them are never used.
Result
The path is a temporary black line inside the volume, with the two picked voxels shown as points. It is not added to the Scene tree and disappears when you close the tool. To see the line inside the volume, lower the opacity of the voxel object or use Volume Rendering.
To check the values along a straight line instead of a route, use Voxels Line Graph.
