Allow calculation of depth

src/ifcblenderexport/blenderbim/bim/qto.py

@@ -15,7 +15,7 @@ class QtoCalculator():
             return self.get_length(obj)
         elif 'width' in prop_name:
             return self.get_width(obj)
-        elif 'height' in prop_name:
+        elif 'height' in prop_name or 'depth' in prop_name:
             return self.get_height(obj)
         elif 'area' in prop_name \
                 and ('footprint' in prop_name or 'section' in prop_name):

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -105,7 +105,8 @@ class BIM_PT_object(Panel):
                 row.prop(prop, 'string_value', text='')
                 if 'length' in prop.name.lower() \
                         or 'width' in prop.name.lower() \
-                        or 'height' in prop.name.lower():
+                        or 'height' in prop.name.lower() \
+                        or 'depth' in prop.name.lower():
                     op = row.operator('bim.guess_quantity', icon='IPO_EASE_IN_OUT', text='')
                     op.qto_index = index
                     op.prop_index = index2