Autodesk Revit Tutorials, Revit Families, BIM Revit

   
     
     
djdfjdj

Principles of Modeling in Revit

 

Solids and Voids

Many complex shapes you wish to design go beyond the four basic form making techniques we just explored. Designs often require a combination of forms that are both additive and subtractive. To accommodate richer modeling, Revit approaches this problem by allowing any form to be solid or void. Solids are positive, physical elements, and voids are invisible, cutting elements that remove form from solids.
All the forms we covered (extrusion, revolve, sweep, blend) can be made as either a solid or a void. This is represented in the design bar, where you have the two options: Solid Form and Void Form.
Insert Image
Examples showing use of Voids
Voids can be used in many ways to arrive at some surprising geometric forms. Think of a void as a way to carving away from a solid chunk of clay—you can truly sculpt with this tool!
 
Vaults
In Figure 6.56, complex vaults have been created out of solid pentagonal extrusion and half circle void extrusions cutting through it. Note: you will need to use the Join Geometry tool to have the void cut the solid.
Figure 6.56
Vaulted space created out of combination of solid and void extrusions
 
Tower shapes
The basic shape of the tower shown in Figure 6.57 is a simple blend. A plow shape is used at the base, and a triangular shape defined for the top. Then a simple curved shaped void extrusion is used to carve out the blend. The result is an interesting shape that is far more complex than what you’d expect to be able to do with the four basic modeling forms.
Figure 6.57
A blend with a void ex-trusion results in some very interesting forms!
 
Complex roofs
A shape like the one shown in Figure 6.58 could be created using two revolved shapes and then cut off using a void square around the edges.
Figure 6.58
Use of a simple void to cut our geometry from a revolved shape
 
v