To Create Slab/Roof Slab Body Modifiers

Like interference conditions, body modifiers let you modify the geometry of a slab or roof slab by incorporating another three-dimensional (3D) object. However, where interference conditions always subtract from the mass of a slab or roof slab and affect only components that they touch, body modifiers can be used to add to, subtract from, or completely replace a specific component. If a slab or roof slab has only one component, then the body modifier applies to the entire slab or roof slab.

You can create a body modifier from a mass element, a mass group, or any other AEC object with mass. You can also create body modifiers from ACIS solids or blocks that form 3D bodies. You must place the object in the location you want in the drawing before defining the object as a body modifier.

After you create a body modifier from an object, you can delete the original object. However, if you have created a complex object, such as a mass group comprising many mass elements, you may want to retain the object in the drawing until you are sure you have the results you want for the slab or roof slab.

Note: Objects used as interference conditions are not included for the Area in the LIST command or in a Schedule Query result.

To create a body modifier for a slab or roof slab:

1. Create one or more objects in the location where you want the body modifier positioned in relation to the slab or roof slab.
2. Select the slab or roof slab you want to modify, and

   if the object selected is…	then…
   a slab	click Slab tabModify panelBody Modifier drop-downAdd.
   a roof slab	click Roof Slab tabModify panelBody Modifier drop-downAdd.

3. Select the objects to be applied as body modifiers, and press Enter.
   

4. On the Add Body Modifier worksheet, specify the following:
   • For Slab Component (or Roof Slab Component), select the component to which you want the body modifier applied.
   • For Operation, select Additive, Subtractive, or Replace, depending on whether you want the body modifier added to the selected component, subtracted from it, or used to replace the entire component.
   • For Description, enter a text description of the body modifier(s) you are applying.
5. If you do not want the outline of the object(s) to be visible in the drawing, select Erase Selected Object(s).
6. Click OK.