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This op performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U and V), nor do they need to form a solid as a group (for example, you can cut a grid with a sphere).
The surfaces in the first input are denoted by "A" in the parameter list. The surfaces in the second input are denoted by "B". The entire A set is intersected with the B set, which allows for true csg operations with spline surfaces. Thus, if A forms a solid and B forms a solid, any boolean operation between A and B will produce a solid. If either set has an open topology, the result will also be open.
What is deemed to be the inside and outside of a trim region depends on the direction of the surface normals. If necessary, use the Primitive SOP to reverse the surface normals by reversing the surface’s U or V direction.
Subset of NURBS and Bezier surfaces
Subset of NURBS and Bezier surfaces to intersect with A
World space precision of the intersection
Domain precision of the intersection
Number of steps for tracing each profile span
Boolean operations between the surfaces in A and B
Union, intersect, A - B, B - A, or user-defined:
Keep Inside A
Preserve the inside sections of the A surfaces
Keep Inside B
Preserve the inside sections of the B surfaces
Keep Outside A
Preserve the outside sections of the A surfaces
Keep Outside B
Preserve the outside sections of the B surfaces
Just create profiles where the surfaces intersect
Which surface to output profiles for: A, B, or both
A Profiles Group
Place the A profiles in a user-defined group
B Profiles Group
Place the B profiles in a user-defined group
Avoid Already Trimmed-Out Parts
Intersect only the visible surface parts and truncate the intersection profile at the trimmed-in surface boundaries.
Join Profiles Created By Multiple Surfaces
If a surface has several adjacent profiles caused by its intersection with two or more surfaces, the profiles will be joined into a single curve-on-surface
This example demonstrates the use of the Surfsect SOP’s boolean operation.
First a box is used to subtract from a Sphere leaving 4 disks. Then the Sphere is used to subtract from the Box leaving just the corners.
The following examples include this node.