problem subtract partially intersecting volumes asymmetric

[mhanson]

Hi all. Having a problem subtracting two partially intersecting volumes that have asymmetric roofs.
Ie. in full i have two rectangular (in plan) spaces which have rooms open to the roof slopes so i need to model the full volume. Each have monopitch roofs sloping opposite to each other. The spaces overlap in part on corners.
What i am struggling with is how to subtract the volume where the two intersect/overlap. It seems you can only subtract volumes (using the 'connect spaces' tool) when the volume to be subtracted is exactly contained with the volume being subtracted from.
Yet that is really difficult /impossible to create (it seems to me) when you have such as these asymmetric roof slopes.

If i model them separetely then try to overlay them by moving vertices i get an error message "space 'xxx' intersects existing space"

Any ideas?
M Hanson

[mhanson]

Ah. Solved it - workaround was to Trim the intersecting element (ie was an extrusion of arbitary 10m height) first so it was solely left as part of the larger volume (ie with the slope roof top), then Subtract that remainder from the larger volume. Method: (Using Connect Spaces button, select smaller cutting element then the larger volume and click the Trim button, then do similar process by selecting larger volume and then the smaller and click Subtract)