创建直纹面

Synopsis

obj = RLDSRF/obj1,[point1],obj2[,point2]

Description

Creates a body whose underlying surface type is a ruled B-surface. You create the body by assigning a one to one correspondence between points on two curves and connecting the corresponding points with straight line rulings.

Parameters

Parameter

Description

obj1,,obj2

Two existing curves. If point1 is omitted, its field must appear, but left blank.

point1,point2

Two previously defined points which may be used to indicate which ends of the respective curves are associated in the ruling process. These points do not have to lie on the curve but must be closest to the desired end. If a point is not specified, a default reference point corresponding to the starting parameters of the curve are used.

NOTE: If point1 is not specified two commas must be inserted between ent1 and ent2. For example:

ENTITY/L(2),SURF1
L(1)=LINE/0,0,0,1
L(2)=LINE/0,1,1,1
SURF1=RLDSRF/L(1),,L(2)

As two different bodies may be generated between any two curves, caution must be exercised when specifying reference points or assuming the default reference points.

Examples

Creating a ruled B-surface type body between a line and a spline.

Declarations

ENTITY/PT1,P(4),SPLN1,LN1,RSRF1

Geometry Definition

PT1=POINT/-1,-1
P(1) =POINT/-1,0
P(2) =POINT/-.5,.25,.25
P(3)=POINT/.5,-.25,-.25
P(4) =POINT/1,0
SPLN1=SPLINE/P
LN1=LINE/1,-1,-1,-1

Body Definition

RSRF1=RLDSRF/SPLN1,,LN1,PT1

Ruled B-surface Type Body Using a Reference Point

Parameter	Description
obj1,,obj2	Two existing curves. If point1 is omitted, its field must appear, but left blank.
point1,point2	Two previously defined points which may be used to indicate which ends of the respective curves are associated in the ruling process. These points do not have to lie on the curve but must be closest to the desired end. If a point is not specified, a default reference point corresponding to the starting parameters of the curve are used.