Extend to intersect
Best practice advice please, to achieve ...
In the attached dwg, the 76mm thick roof covering slab, white on Layer 0, sloping 12.5o diagonally, was created by DMEXTRUDE from the roof structure slab, cyan on Layer con-Solid, so it has square edges. One edge is pushed back to reveal the cyan slab below.
Now, how to extend the white slab to overhang the walls, on four edges? Slab edges to remain square. The extend to be such that the slab's top edge finishes 300mm horizontally outboard of the wall face.
Can see on two of the faces that I did it by COPY FACE (or was it EXTRACT FACE) as a Region>move 300mm outboard.
Then PUSHPULL, and to my amazement found that 3D Snap to intersection would snap the slab top edge to its intersection with the Region, as I pull it 'through' the Region.
Sort of. It was v tricky and only worked after many tries. And though it snapped, was not quite accurate - the Region is offset 300mm but the extend measures 299.998. So maybe it was just a lucky 'done by eye' operation.
Any better ways to do this?
How is 3D Snap to intersection supposed to work in this situation i.e. how exactly should I move the mouse, maybe UCS or something, to make it work reliably?