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<PRE><dy 090920 ok>
<A HREF="CAD_using_en.htm">See operating CAD ..</A>
CAD-functions for modifying geometry
CUT, Trim
Intersect, intersection curves (INT)
Transform (move, rotate) (TRA)
Project
Mirror
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<h2>CUT (trim) obj CUT</h2>
Trim / limit linear elements (lines, curves).
(Separate with one or two cutting elements).
Caution: currently only for curves, not yet for surfaces/solids and CCVs.
<b>CUT Obj CuttingElement (CuttingElement2) (Variant)</b>
<b>Obj:</b> this element will be changed (trimmed).
If it is already trimmed, also its parent-object will be displayed
in the selection-list.
<b>Cutting element:</b> the object will be separated with this element
one (optionally two) elements, e.g. points.
For curves, parameter values (0-1) can be used.
<b>Variant:</b> which of the resulting elements will be retained
Other/s will be discarded
Change with the Page Up/Page Down keys
Default or “1” saves the first resulting object
Example:
L20 = P(-60 30 0) P(20 70 0)
C20 = P(-14 40 0) VAL(32) DZ
C20 = CUT C20 L20 L20
# Circle C20 is limited at both ends (trimmed).
Parameter values as cutting element:
S21 = CUT S20 0.33 0.66
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<h2>INT (intersect) obj INT</h2>
Create intersection points / intersection curves.
<b>resulting_object = INT Obj1 Obj2 [version] [POL]</b>
Obj1: object 1
Curve or surface. Continue with Tab-key
Obj1: object 2
Curve or surface
For curves, parameter values (0-1) can be used.
Version: Define which element of the result is to be saved.
Other/s are discarded.
Select using the PageUp/PageDown keys.
Default or "1": Saves the first result object (point or curve)
"2" would select the second one ..
POL: Only for curves as a result
output is polygon or spline (default is spline)
Example:
P20 = P(-62.5 -63.7 0)
S20 = CCV P20 P(-20 -70) P(-40 -15) P20
A20 = S20
#
P21 = P(-60 -110 20)
P22 = P(S20 MOD (2) 1)
S21 = POL P21 P20 P22 P21
A21 = S21
#
R20 = X(-35)
#
# A group of Areas:
S22 = INT U(A20 A21) R20 POL
# point from intersection line x surface:
P1=INT L1 A1
# curve from intersection curve X surface:
# (curve: circle, ellipsis, B-Spline) not yet implemented
# curve from intersection surface x surface:
S1=INT A1 A2
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<h2>TRAnslate obj (VC) TRA</h2>
Translate an object
Result = Object TRA Obj_to_move vector [length]
TRA Obj_to_move: this object is moved
Vector
Currently, new objects are always created.
Open: the shift is not parametric but permanent.
(The base object is changed).
# Objects to move a vector (REV: opposite direction).
# Obj = vec TRA obj/traVC [REV]
P20 = P(100,0,0)
P21 = TRA P20 D(0 0 100)
T20 = D(10 10 10)
P22 = TRA P21 T20
# TraVC (T20 in the example): see Transformation
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<h2>TRAnslate obj (PLN) TRA</h2>
Move an object to a different reference system.
Each layer can be used as a reference system.
Result object = TRA object reference system [REV]
Reference System
REV: Move an object from a reference system back into the main location.
Example:
R20 = P(100 100 25) D (-1 0 2)
L20 = P(100 100 25) P (100 120 25)
# Move line L20 to the Refsys R20
L21 = TRA L20 R20
# Move a line back into the main location.
L22 = TRA L21 R20 REV
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<h2>TRAnsform obj (Tra) TRA</h2>
Transformation of objects (move, rotate).
The transformation must be defined previously!
Result object = TRA object transformation
Transformation: Select example using the PageUp/PageDown keys
Translation:
P20 = P(100 0 0)
Translation # Z in the direction of 100 mm
T20 = DZ VAL(100)
P21 = TRA P20 T20
Rotation:
P20 = P(100 0 0)
# Define a 30-Grad-Rotation to line L20
L20 = P(50 0 0) P(50 0 10)
T20 = ROT L20 ANG(90)
# P20 rotate
P21 = TRA P20 T20
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<h2>Project obj PRJ</h2>
Project points or linear elements (lines, circles, curves) onto
an other linear element or on a surface.
Resulting_object = PRJ object targetObject [direction] [solutionNr]
object: project this object -
targetObject: - onto this object.
direction: projection-direction, a vector; none: normal to targetObject.
solutionNr: 1-n, PgUp/PgDown keys.
Example:
P21=PRJ P20 R20
# Point P20 will be projected on the plane R20; direction is perpendicular.
S20 = PRJ S20 R20 D20
# Curve S20 will be projected in direction of D20 on the plane R20
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<h2>Mirror obj (Plane) MIR</h2>
Reflect objects across a plane
Currently, only for linear elements, not surfaces
Result object = MIR object level
Example:
S20 = MIR S20 R20
# Curve S20 suspended at the level R20 mirrored.
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<h2>ISOparametric Curve from Surf ISO</h2>
Extracts an isoparametric curve from a surface.
Currently only B-Spline surface. Entering point or parameter value has not yet been implemented
Input:
Surface
Parameter value (0-1)
Default: lengthwise Direction; "CX" defines lateral direction.
(Modifier CX = across; Default = along)
S = parameter surf ISO/point (direction U/V)
Example:
# Cross-section curve in the middle of the surface A20:
S20 = ISO A20 .5 CX
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