re working a mesh (site plan)

[Anonymous]

Ok this is going to be hard to put into words so bare with me…

Iv got my survey plan in and made it into a mesh. Iv elevated all the contours and it’s a perfect representation of the block..
Now usually I stick the house on and trace the perimeter of the building and “space click” this and cut a hole in the mesh where the house sits.

This has been fine up until now.. the job im working on is going to require a massive amount of earth to be removed from the block and the estimators want me to give them an approximate cubic amount of whats getting removed.

So yeah that’s easy. Make 2 meshes, one the existing and one with the proposed cut and subtract he 2 amounts.. only problem is iv been just cutting a hole in the mesh.

So trying to remember how to actually make the cut..

1st I trace the building.. then I offset that by like 5mm.

i space click the 2 and fit them to user ridges.. the outside one (the offset one) is there to hold the contour of the land around the building.. the 2nd one I elevate down to the cut pad level.. only problem is all the contour nod points with in this one are still at there natural height.. I know I could just select them individually and lower then to suit the cut height… but I remember in my AC training class there was a quicker way to get them all to drop at the same time.

[Brett Brown]

All I do is use the floor slabs,paths etc of the building as SEO's, and then subtract with upwards extrusion. Select mesh with the element information open to get the new volume and subtract from the original mesh volume.

[Anonymous]

Do a search for another thread by the name DISPLACED VOLUME which discusses similar issue.
HTH

[Chris Grantham]

Here you go:

http://archicad-talk.graphisoft.com/viewtopic.php?t=25796

We were able to determine the amount of earth to be exported down to the truckload. We'll see how accurate we are when it actually happens! There is a running pool in the office on the under/over.

[Anonymous]

sweet. thanks guys.. worked perfectly EXCEPT for my driveway.. as my drive way is a mesh... but tthats easy to work around..

1500 cubic meters to be removed not a bad sized hole.

thanks again..



PS - Chris, i hope u accounted for "fluffage" (how ever its spelt.. i think rule of thumb is 20% increase in volume after u start digging it up