Unroll: Difference between revisions
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* cylinder radius | * cylinder radius | ||
* and optionally a point on the axis (''otherwise CloudCompare can try to guess it by computing the gravity center of the point cloud'') | * and optionally a point on the axis (''otherwise CloudCompare can try to guess it by computing the gravity center of the point cloud'') | ||
[[Image:Unroll_angles.JPG|frame|center|'Unroll angular zero and sign' dialog]] | |||
=== Cone === | === Cone === | ||
Revision as of 22:57, 28 September 2022
Menu
This tool is accessible via the 'Tools > Projection > Unroll' menu.
Description
This method 'unrolls' a point cloud from a cylindrical (or conical) shape onto a plane:
Procedure
Select a single cloud then start this tool.
Cylinder
To unroll a cylindrical shape, the parameters are:
- axis of revolution (X, Y or Z)
- cylinder radius
- and optionally a point on the axis (otherwise CloudCompare can try to guess it by computing the gravity center of the point cloud)
Cone
Since version 2.9, this method unrolls a cone in a way that preserves surfaces (as if the cone was 'rolling' on a planar surface).
To unroll a conical shape, the parameters are:
- axis of revolution (X, Y or Z)
- half angle (this is the aperture angle at the cone apex) in degrees
- the cone apex position in 3D
Straightened cone
This mode was corresponding to the 'Cone' unrolling mode in version 2.8 and prior.
This method unrolls a cone-shaped cloud as if it was a cylinder, by first 'straightening' the cone walls.
To unroll a straightened conical shape, the parameters are:
- axis of revolution (X, Y or Z)
- half angle (this is the aperture angle at the cone apex - in degrees)
- the cone apex position
- the base radius of the 'straightened' cone (= cylinder)