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Expression to return the volume of earth cut

Josh Verran
Advocate

When documenting the earthworks on a project we draw two meshes.

One which is based on the original survey data, this mesh doesn't change through the life of the project.

The other is a copy of the original, which has all the solid operations etc.

Each has their own layer and relevant reno status.

Both have the same Classification as in that respect they are the same.

 

I can use a schedule to show the volume of both, then manually calculated the difference which is either the cut or fill volume. Can also export to excel, do the same, then import again.

 

What I want to achieve is a schedule that automatically displays the cut volume.

I have started to go down the path of expressions, however the expression is just a property assigned to an element, I don't know if/how you could even say property = the Net Volume of X, - the Net Volume of Y.

 

Any ideas?

 

Thanks in advance.

The below is a bad example of how it doesn't work.

 

Screenshot 2021-10-15 152323.pngScreenshot 2021-10-15 152714.png

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