Possible bug with how VTK cutter and slicer is used to create rasters in plane raster planner?

[srsidd]

I'm following the implementation for the planar raster planner and it looks like PCA is used to find the longest vector of the mesh, and the cut_direction is then to create rasters evenly spaced by the line_spacing_ parameter.

I have a use case where this does not seem right. The mesh I'm using is a rectangle, and I want the segments generated along the longest edge like this -

The cut direction is being specified with a FixedDirectionGenerator. Going over the code, we generate a max_extent from the length of the principle axes. However, this seems incorrect, as this would generate a vector along X-axis (From the above pic), but the cut_direction is specifying that we generate raster segments along the Y-axis.

Tracing the code further, it seems like we loop through the number of planes and make cuts at start_loc * i * line_spacing. Considering the shape of this mesh, even a small line_spacing covers the entire mesh with a few raster segments. Why are we looping through the longest edge and trying to generate cuts / planes at locations that are outside the mesh? If I reduce my line_spacing_, the number of planes go up drastically, compared to the number of segments that cover the mesh.

To me, this seems like a bug and we should not be creating planes by longest PCA vector, but the direction specified by the cut_direction.

Would appreciate any feedback / advice on if my thought process is right here.