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#64413 by Nick Pyner
Sat Jun 28, 2014 12:07 am
Here's a cheap trick that I should have seen long ago.........

The objective is to measure the total roof area as viewed by God - irrespective of storeys, overlap, slope, etc., for the purposes of determining rainwater collection.

Starting with just the roof plan:

1. On a new exclusive layer, draw a 2D polygon round the entire roof, but clear of it.
2. Draw one line from anywhere on the roof across any line on the polygon
3. Put a contour search hatch between the roof and the polygon.
4. L,F4 this layer, and get the area of the unhatched zone by contour search.

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