Body-aligned voxel blocks
 

I am trying to make body-aligned voxel cells in a block. As a test case, I took a cylinder rotated +30 degrees about the y-axis and created an unstructured voxel block around it aligned with the global coordinate system. The voxel cells created using this method are not body-aligned as I expect but are actually rotated -30 degrees about the y-axis.

How can I make proper body-aligned voxel cells? How does pointwise compute the body axes?