EY wrote:
Hi James
You are right but what is the meaning of "Subtract up with slabs drawn with the pen you want for the ground line, and use Inherit Attributes of Operator." Could you give me some clues.
EY
Solid Element Operations. In the reference guide starting on page 390. Access the Solid Element Operations palette from the tools menu. Among other things, briefly, SEOs let you cut one volume (target) with another (operator), and you can optionally cut up or down through the target. IMO this is the best way to cut meshes for buildings, because an SEO hole can have a bottom rather than going all the way through.
Another advantage: SEOs are 'live'. If you modify the shape of the operator, the shape of the hole will change. If you delete the slab, the hole goes away.
When you do an SEO, you choose what attributes you want the newly-created surfaces and edges to have. They can have the same attributes as the rest of the target element, or they can 'Inherit Attributes of Operator', taking on the pen and material of the element they were cut with. In your case, you can draw the mesh with a white-printing pen, and a cutting slab with a visible pen. In the layout the mesh surface and outline will be invisible, though not hidden, but you can see the lines of the hole.
Without giving the whole thing away, since it's beneficial to struggle: Place a slab with the shape of the building footprint, at the level of the bottom of the building. The bottom plane of this slab should align with the bottom of the building slab. Put this slab on a hidden layer. Do the SEO, mesh is target, slab is operator, operation is 'Subtraction with Upwards Extrusion', choose 'Inherit Attributes of Operator'. If the foundation has different levels, you'll need more slabs.
HTH,
