Physical_Engine: Consistent Volume and MaterialComposition Behavior for Elements Containing Other Elements with Volume

[enarhi]

Description:

Currently, the Physical methods for SolidVolume and consequently MaterialComposition do not account for an elements openings (the method simply does element area * thickness).

As per:

we would like to align these so they always return volumes and compositions inclusive of their contained elements.

Steps to reproduce:

Create an element with nested elements with volumes, such as a wall with openings that have their own construction and resulting volume. The volume and composition returned only account for the wall itself, excluding the contained elements.

Expected behaviour:

The resulting volume and composition should include the volumes and materials of all contained opening elements.

Test file(s):

Test File