When you import a part, the Additive application internally creates a bounding box around the part using the outermost edges of its dimensions. This bounding box is known as the simulation domain. The location of the minimum X, Y, and Z dimensions of this domain becomes the new origin (0, 0, 0) for the purposes of voxelization and calculations. Furthermore, the application assumes the X-Y plane at Z=0 is the top of the baseplate. Result items, such as displacements, will be output in coordinates based on this translated origin.

The simulation domain will be adjusted again, with the origin translated to the minimum X, Y, and Z dimensions, when you import supports for the part. Ultimately, when meshed with voxels, some voxels within the domain are part material, some are support material, and some are powder.

In the geometry preview window, be careful to distinguish between the triad legend, which is shown simply for directional perspective, and the new, translated origin of the simulation domain, which is not shown. The triad legend is not the origin.