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Description:
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A
face is a topological entity that is a portion of a single geometric surface. One or more loops of edges bound a face. Faces are open or closed. A face with no loops occupies the entire surface, finite or infinite, on which the face lies. Thus a face may stand for an infinite plane or for a complete sphere. Each face records its sense relative to its underlying surface (same sense or opposite sense).
face objects are saved and restored as part of the model.
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Derivation:
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face : entity : scheme-object
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C++ Type:
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FACE
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External Rep:
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#[entity %d %d]
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where the first integer is the entity ID,
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and the second integer is the part ID.
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Example:
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; face (data type)
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; Create and inquire a face object.
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(define my_block (solid:block (position 0 0 0)
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(position -25 -25 -25)))
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;; my_block
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(define my_faces (entity:faces my_block))
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;; my_faces
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; (#[entity 2 1] #[entity 3 1] #[entity 4 1]
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; #[entity 5 1] #[entity 6 1] #[entity 7 1])
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(face? (car my_faces))
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;; #t
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