[Volume Issue with Hardscape/Site model]

I have done a site model of a terrain. When I insert a "Hardscape" object from level zero, I would expect the Volume of the site model (of the terrain) would minus the volume occupied by the hardscape object. Yet this is not the case. See attached 2 images.

 

I have also tried with the site modifier with Pad with retaining edge. But For some reason, I cannot get the pad to have clean laser-like cut edges from the contours nearby, instead I get a regrading which I don't want, any help please?. I understand I can use a grade limits but with the offset, I would loose the accuracy of the amount of cut. 

Any help would be much appreciated!
Brian

[QTY of Selected object]

Hi Kevin,

This is when I use different "Poly-Vertex Placement Mode" for different groups of plants.

 

It gives me the quantity per group using the "Poly-Vertex Placement Mode" but when I select several groups (as in the photo attached in 1st post), the Quantity area is blank. 

Really need help on this one to make a Bill of Quantities.

 

Any help or guide would be much appreciated!!!

 

Brian

[QTY of Selected object]

Hi!

 

When I selected a "group" of plants, the qty is given in the Object Info - Data Palette (See picture QTY1.gif attached). But when I select many "groups" of plants, the total quantity doesnt show. Can anyone help me? (See picture QTY2.gif attached) thanks!

 

Brian