How do I get a bounded volume betwenn 2 surfaces without creating another comparison surface?
C3D 2010
Creating a TIN volume surface is the easiest way.
Another way is to create a boundary by polyline, apply it to both the surfaces and then run Surfaces --> Volumes, but this is more work the just running Bounded Volumes IMO.
Nathan
In addition to Nathan's reply...and to be short...You Can't. That TIN Volume Surface (comparison surface) is required for bounded volumes.
Seams kind of stupid. I'm ending up with way more surfaces that I need to calculate quantities on subsurface stratas which sometimes occur in varying protions of the site. I'm having to make models for each area.
I migrated from eagle point and this was as simple as drawing a closed polyline and selecting the 2 surfaces.
what exactly are you modeling to take off?
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"..Seams kind of stupid. I'm ending up with way more surfaces that I need to calculate quantities on subsurface stratas which sometimes occur in varying protions of the site. I'm having to make models for each area.
I migrated from eagle point and this was as simple as drawing a closed polyline and selecting the 2 surfaces..."
I agree that bounded volumes are a bit rubbish in C3D and you should be able to, for example, calculate volumes between existing and proposed surfaces without creating a volume surface. As mentioned other software manages to accomplish this with no major problems
neilyj (No connection with Autodesk other than using the products in the real world)
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Try the Site Tools program from Steltman Software.
He has developed a number of routines to set pregrade depths and calculate volumes from any number of areas in the project site using just 2 surfaces.
If you go to the "Analyze" tab there is a command for computing volumes between two surfaces without making a volume surface. If you have pockets of subsurfaces it will only compute the volumes where the two surfaces overlap.
Regards,
Peter Funk
Autodesk, Inc.
Sound interesting, whereabouts is that?? have you got an example to post?
neilyj (No connection with Autodesk other than using the products in the real world)
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In answer to my own question in the previous post - the volume reported is only for the full surface not by a defined boundary as in the Bounded Volumes option.
Whether the surface could be cropped to the area of interest and volume then calculated I'm not sure but presumably so...
neilyj (No connection with Autodesk other than using the products in the real world)
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If you have an EGL and a composite FGL (i.e. the new earthworks pasted into EGL) then you can use surface boundaries to compute certain areas.
I have several discrete platforms identified that daylght to EGL and by creating a closed polyline around one platform and adding as non destructive outer boundary in composite FGL, the normal volume analysis tool gives the platform cut and fill (as long as the closed polyline extends beyond the daylight line it works well). Drag/move the polyline to another platform, rebuild the surface and recompute the volume and do this for all areas of interest
neilyj (No connection with Autodesk other than using the products in the real world)
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