Welcome to AR-327 !!

Today's learning objectives:

Understand the basics of Boolean operations
Learn to use it on basic Rhino geometries

Boolean Operations

How would you realise such geometries in Rhino (manually) ?

Boolean Operations

In theory 3 boolean operators exist: And, Or, Not

Boolean Operations

Rhino defines 4 operations:

Intersection(And)
Union (Or)
Difference (Not)
Split (Not & And)

Boolean Operations

A small word about tolerances:

We deal with geometries with intersections: tolerances are very important!

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

Boolean Operations

A small word about brep orientation:

Breps have an orientation, that is important for boolean operations:

	    
            # Making sure that `my_brep` is ready for boolean operation:
            orientation = my_brep.SolidOrientation
            if orientation == Rhino.Geometry.BrepSolidOrientation.Inwards:
                my_brep.Flip()

Boolean Union

A Boolean union will combine multiple objects into fewer objects that don't intersect:

Boolean Union

And in code ?

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

            breps = [brep1, brep2, brep3, brep4]
            unions = Rhino.Geometry.Brep.CreateBooleanUnion(breps, TOL)

Boolean Union

And in code ?

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

            breps = [brep1, brep2, brep3, brep4]
            unions = Rhino.Geometry.Brep.CreateBooleanUnion(breps, TOL)

What will be the type of `unions` ?

Exercice on Boolean union (20 min)

In the website, go to the boolean union page and solve the third exercice (02). You will need the .3dm as well

Boolean Difference

A boolean difference substracts from a volume all the space that also belongs to another volume

Boolean Difference

And in code ?

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

            first_list = [brep_1, brep_2]
            second_list = [brep_a, brep_b]

            differences = Rhino.Geometry.Brep.CreateBooleanDifference(first_list,
                                                                      second_list,
                                                                      TOL)

Exercice on Boolean difference (20 min)

In the website, go to the boolean difference page and solve the first exercice (01). You will need the .3dm as well

Boolean Intersection

A boolean intersection keeps the volume that belongs to elements of both sets of volumes:

Boolean Intersection

And in code ?

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

            first_list = [brep_1, brep_2]
            second_list = [brep_a, brep_b]

            intersections = Rhino.Geometry.Brep.CreateBooleanIntersection(first_list,
                                                                          second_list,
                                                                          TOL)

Boolean Split

A boolean split performs an intersection and a difference in parallel and returns both results:

Boolean Split

And in code ?

	    
            TOL = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance

            first_list = [brep_1, brep_2]
            second_list = [brep_a, brep_b]

            splits = Rhino.Geometry.Brep.CreateBooleanSplit(first_list,
                                                            second_list,
                                                            TOL)

Exercice on Boolean difference (yes, another one) (20 min)

In the website, go to the boolean difference page and solve the second exercice (02). You will need the .3dm as well

Assignment (last one!)

Deadline: 21st of may