That function applies an axial symmetry along a plan median to the non-selected axis:
- either to the whole model if nothing is selected
- or to the selected voxels
It emulates the reflection of a mirror that copies half of the object into the other half. On the right example image, diagonal
x behaves like a mirror represented by the red line.
In both case, the "mirror" plan starts from the coordinate origins of the axis, and stretches at 45° towards the opposite object edge.
The transformation enlarges the object limits if needed,
256 voxels being the maximum size of each side of an object.
See also mirror function.