surface?
List of: Scheme Extensions
Subjects: Physical Properties
Contents: Kernel

Action: Determines if a Scheme entity is a surface.

Filename: kern/kern_scm/surf_scm.cxx

Syntax: (surface? object)

Arg Types: object scheme-object

Returns: boolean

Description: The extension returns #t if the object is a surface, and #f if it is not a surface.


object specifies the scheme-object that has to be queried for a surface.

Example: ; surface?

; Create a solid block.

(define block1


(solid:block (position 0 0 0)


(position 10 10 10)))

;; block1

; Create a cylindrical face.

(define cyl1


(face:cylinder (position 0 0 0)


(position 0 20 0) 10))

;; cyl1

; Determine if the solid block is a surface.

(surface? block1)

;; #f

; Get a list of the faces of the block.

(define entities1


(entity:faces block1))

;; entities1

; Convert one face to a surface.

(define surface1 (surface:from-face


(car entities1)))

;; surface1

; Determine if one of the surfaces of the block

; is actually a surface.

(surface? surface1)

;; #t
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