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Boolean operations illustrate the true power of
ACIS and solid models. Booleans are used to unite or intersect two solid bodies, or to subtract one solid body from another.
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The following example creates a block and a cylinder and uses Boolean operations to unite them. Instead of
solid:unite,
solid:intersect or
solid:subtract could have been employed to create other unique solids.
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Scheme Example
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; Create a solid block.
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(define my_block (solid:block (position -20 -20 -20)
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(position 20 20 20)))
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;; my_block
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; Create a cylinder.
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(define my_cyl (solid:cylinder (position 20 0 -20)
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(position 20 0 20) 20)))
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;; my_cyl
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; Unite the two bodies into a new body.
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(define my_united (solid:unite my_block my_cyl))
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;; my_united
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; Save the results to an output file.
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(part:save "tmpbool1.sat")
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;; #t
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Figure 8-6. Unite Block and Cylinder
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Some of the Scheme extensions related to Boolean operations on models are:
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body:combine
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Combines a list of solid and/or wire bodies into a single body.
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body:separate
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Separates a single disjoint body into multiple entities.
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bool:intersect
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Intersects two or more bodies.
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bool:merge
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Combines faces and edges of equivalent geometry.
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bool:merge-faces
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Combines specific faces on a body.
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bool:nonreg-intersect
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Intersects two or more nonregularized bodies.
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bool:nonreg-subtract
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Subtracts one or more nonregularized bodies from a body.
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bool:nonreg-unite
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Unites two or more nonregularized bodies.
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bool:regularise
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Regularizes an entity.
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bool:subtract
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Subtracts one or more bodies from a body.
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bool:unite
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Unites two or more bodies.
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curve:intersect
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Gets the intersection between two edges or curves.
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edge:project-to-plane
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Projects an edge onto a plane.
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edge:split
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Splits an edge into two entities at a specified position.
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edge:trim-intersect
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Trims both edges to the intersection of the edges.
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face:intersect
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Gets the intersection curve between two faces.
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position:project-to-line
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Gets the projection of a position on to a line.
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position:project-to-plane
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Gets the projection of a position onto a plane.
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solid:imprint
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Imprints curves of intersection of two bodies onto the faces of bodies.
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solid:imprint-stitch
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Joins body1 and body2 along the intersection graph.
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solid:intersect
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Intersects a list of solids.
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solid:planar-slice
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Slices a solid body with a plane to produce a wire body.
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solid:slice
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Gets the intersection graph between two bodies and returns it as a wire body.
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solid:split
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Splits all periodic faces of a body along the seams.
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solid:stitch
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Joins body1 and body2 along edges or vertices of identical geometry.
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solid:subtract
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Subtracts a list of solids from a solid.
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solid:unite
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Unites two solids.
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