Subcriterias

[aecoursen]

We're looking to calculate volumes of the same fill material using multiple surfaces over the course of our alignment.  We figued using subcriterias would take care of this task but it doesn't appear to be working.  We can get the material to work with the first subcriteria, but then adding a second removes the fill material of the first subcriteria and just adds the second.  I would rather not combine the surfaces, but can if I have to.  See the attachments for visuals.  

[AlmasSuljevic]

Hi Andrew,

By looking at the images I could not figure out exactly how things were set up. I hope this document written by Christina Davis may shed some light on the workflow. http://forums.autodesk.com/autodesk/attachments/autodesk/66/15943/1/CV114-2%20Christina%20Davis.pdf 

[aecoursen]

Well I'll try to explain it in words a little better.  The first image depicts a portion of the alignment sections (14+00 and 14+25) that we are looking to quantify material (21) with subcriteria (1) based on the surfaces shown.  The reuslting Fill material is the cyan shaded portion on the left of the section.

Moving on to image 2, at the next two stations (14+50 and 14+75) we are looking to continue to quantify the same Material (21), but with a second subcriteria (2) that utilize 2 different surfaces then what we used from the previous stations.  However when we apply the second subcriteria the cyan fill shape is only applied to the second criteria and removes it from the first.  No matter what we have tried we can't get it to include both subcriterias.  

[fcernst]

 "..but then adding a second removes the fill material of the first subcriteria and just adds the second...  "

I imagine this is working as intended and your surfaces are overlapping (can't tell from the images)... subcriteria are used to isolate areas.

When you add the second subcriteria, any area below the surface in the second criteria that you have specified as having an Above condition is excluded, and any area above the surface in the second criteria that you have specified as having a Below condition is excluded.

[GTVic]

Hopefully no one will object to resurrecting this thread, the online help shows this:

But in reality, if you follow the instructions, as soon as you create the second subcriteria, the area marked 1 is no longer shaded and only 2 is shaded. I'm assuming this is what the OP meant.

However, if you add the blue surface into the first subcriteria like this (where VSOG is the red surface):

Then you can get the correct result.

But this is not following the instructions so I'm not sure if it is a valid solution.

Sample drawing attached.