The 3D ACIS® Modeler (ACIS) is Spatial’s prominent 3D solid modeling engine. 3D InterOp is a CAD data translation framework (Interoperability)

From DocR19

Action

Controls the type of blend surface used when a variable-radius blend is created.

Name String

bl_envelope_surf

Scheme

C++

Description

If this option is on (true), a rolling ball envelope blend surface is created for the variable-radius blend. If it is off (false), a rolling ball snapshot blend surface is created.

Example

; bl_envelope_surf 
; Unite two blocks, then create two blends, one 
; with bl_envelope_surf off, and one with it on 
(define block1 (solid:block 
(position 0 5 0) 
(position 5 10 10))) 
;; block1 
(define block2 (solid:block 
(position 0 0 0) 
(position 10 10 5))) 
;; block2 (solid:unite block1 block2) 
;; #entity 2 1 (iso) 
;; #view 1077019000 
(zoom-all) 
;; #view 1077019000 
(ray:queue 35.8763 -51.7115 28.5678 -0.408248 0.816497 -0.408248 1) 
;; #ray (35.8763 -51.7115 28.5678) 
;; (-0.408248 0.816497 -0.408248) 
(define edge1 (pick-edge)) 
;; edge1 (solid:blend-edges edge1 2) 
;; (#entity 2 1) 
(ray:queue 32.557 -50.0111 35.2878 -0.408248 0.816497 -0.408248 1) 
;; #ray (32.557 -50.0111 35.2878) 
;; (-0.408248 0.816497 -0.408248) 
(define edge2 (pick-edge)) 
;; edge2 (solid:blend-edges edge2 2) 
;; (#entity 2 1) 
(define radii (abl:two-ends-rad 1 2)) 
;; radii 
; ;;Turn option off and create a blend 
(option:set "bl_envelope_surf" #f) 
;; #t 
(ray:queue 29.4386 -53.3763 31.6758 -0.408248 0.816497 -0.408248 1) 
;; #ray (29.4386 -53.3763 31.6758) 
;; (-0.408248 0.816497 -0.408248) 
(define edge3 (pick-edge)) 
;; edge3 
(define edges (blend:get-smooth-edges edge3)) 
;; edges (blend:var-rad-on-edge edges 0 2) 
;; (#entity 6 1 #entity 7 1 #entity 8 1) (blend:network edges) 
;; #entity 2 1 
; Turn option on and create another blend 
(option:set "bl_envelope_surf" #t) 
;; #f 
(ray:queue 29.639 -52.2681 33.6918 -0.408248 0.816497 -0.408248 1) 
;; #ray (29.639 -52.2681 33.6918) 
;; (-0.408248 0.816497 -0.408248) 
(define edge4 (pick-edge)) 
;; edge4 
(define edges (blend:get-smooth-edges edge4)) 
;; edges (blend:var-rad-on-edge edges 0 2) 
;; (#entity 9 1 #entity 10 1 #entity 11 1) (blend:network edges) 
;; #entity 2 1 
; Check convexity of edges 
(ray:queue 34.0659 -49.9426 33.9158 -0.408248 0.816497 -0.408248 1) 
;; #ray (34.0659 -49.9426 33.9158) 
;; (-0.408248 0.816497 -0.408248) 
(define edge5 (pick-edge)) 
;; edge5 
(edge:convexity edge5) 
;; "convex" 
(ray:queue 35.9327 -50.5213 30.8918 -0.408248 0.816497 -0.408248 1) 
;; #ray (35.9327 -50.5213 30.8918) 
;; (-0.408248 0.816497 -0.408248) 
(define edge6 (pick-edge)) 
;; edge6 
(edge:convexity edge6) 
;; "convex_smooth"