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Action:
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Finds the subset of a graph on one side of a plane.
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Filename:
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sbool/sbool_scm/selective_scm.cxx
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APIs:
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api_subset_graph_with_plane
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Syntax:
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(graph:subset-with-plane whole-graph plane-origin
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plane-normal [acis-opts])
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Arg Types:
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whole-graph
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graph
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plane-origin
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position
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plane-normal
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vector
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acis-opts
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acis-options
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Returns:
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graph
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Description:
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Finds the subset of a graph on one side of a plane. The graph must first be split at that plane. It is assumed that the graph is made of entities which are either faces or cells.
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whole-graph is an input graph that is split to get a subset of the graph.
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plane-origin is the position of the plane.
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plane-normal is a vector to the plane.
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The optional
acis-opts contains parameters for versioning and journaling.
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Example:
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; graph:subset-with-plane
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; Create entities
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(define b1 (solid:block (position -40 0 0)
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(position 40 10 10)))
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;; b1
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(define b2 (solid:block (position -40 10 0)
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(position -30 30 10)))
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;; b2
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(define b3 (solid:block (position 30 10 0)
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(position 40 30 10)))
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;; b3
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(define b4 (solid:block (position -5 0 0)
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(position 5 30 10)))
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;; b4
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(define b5 (solid:block (position -35 15 0)
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(position 35 25 10)))
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;; b5
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(define u1 (bool:unite b1 b2 b3))
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;; u1
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(define whole-entity (bool:nonreg-unite u1 b4 b5))
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;; whole-entity
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(cell:attach whole-entity)
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;; (#[entity 7 1] #[entity 8 1] #[entity 9 1]
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;; #[entity 10 1] #[entity 11 1] #[entity 12 1]
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;; #[entity 13 1] #[entity 14 1] #[entity 15 1]
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;; #[entity 16 1])
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(define whole-graph (graph
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(entity:cells whole-entity)))
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;; whole-graph
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(define plane-pos (position 5 0 0))
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;; plane-pos
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(define plane-normal1 (gvector 1 0 0))
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;; plane-normal1
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(define plane-normal2 (gvector:transform
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plane-normal1 (transform:scaling -1)))
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;; plane-normal2
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(define partial-graph1 (graph:subset-with-plane
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whole-graph plane-pos plane-normal1))
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;; partial-graph1
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(define partial-graph2 (graph:subset-with-plane
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whole-graph plane-pos plane-normal2))
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;; partial-graph2
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; Make sure two halves have nothing in common.
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(law:equal-test (graph:intersect
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partial-graph1 partial-graph2) (graph ""))
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;; #t
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; Make sure two halves are both non-empty
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(law:equal-test
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(equal? partial-graph1 (graph "")) #f)
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;; #t
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(law:equal-test
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(equal? partial-graph2 (graph "")) #f)
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;; #t
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