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S7-1V5 Fundamentals, Section 7, November 2002

SECTION 7

WIREFRAME AND SURFACE DESIGN

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Wireframe and surface design concept

Wireframe and surface design interface

Creating wireframe geometry

Creating basic surfaces

Surface-based solid features

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CONCEPT

CATIA V5 Wireframe and Surface Design is used to

create 3D points, lines, curves, planes and surfaces.

3D wireframe elements are often used as referenceelements in the creation of surfaces or solid features.

Wireframe and Surface Design main concepts:

3D wireframe creation - points, lines, curves and planes can be defined

directly in the 3D environment.

Surface design - a surface is used to define the topology of a part thatcan not be defined using solid features.

Surface-based solid features - surface geometry can be used to createsolid features.

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METHODOLOGY 3D wireframe creation

The relative position of components

is defined by assembly constraints.

If a component moves, constraints

can be updated to restore position.

Components positioned

with assembly constraints

Components prior

to positioning

Surface contact and axial

coincidences created

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METHODOLOGY Surface design







Components prior

to positioning



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METHODOLOGY Surface-based solid features







Components prior

to positioning



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The V5 Wireframe and Surface Design tool is used:

to create 3D points, lines, curves and planes used as construction

geometry when defining surfaces or solid features

to create wireframe geometry directly in 3D not limited to a 2D

sketch plane

to create surface geometry defining the part topology which is able

to be used in the creation of solid features


METHODOLOGY

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WIREFRAME AND SURFACE INTERFACE

Accessing the workbench

Settings and customizations

Workbench toolbars

Terms

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ACCESSING THE WORKBENCH

Access the Wireframe and Surface Design workbench

1. Select Wireframe

and Surface Design

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Activating the Wireframe and Surface workbench:

A new part document is created.

An Open Body is added in the tree as the In Work Object.

ACCESSING THE WORKBENCH

Wireframe and Surface

Design workbench

Open body is the

In Work object

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SETTINGS AND CUSTOMIZATIONS

Select the

Shape branch

Wireframe and Surface Design settings Settings that effect wireframe and surface creation are linked to the

settings for Part Design.

Settings are identical and can be changed in Shape or Part Design.

Settings are

linked

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Select:

Selection tools and Sketcher.

Wireframe and Surface Design toolbars

WORKBENCH TOOLBARS

Wireframe:

Create 3D wireframe

geometry.

Select

Sketcher

Point

Line

Plane

Projection - includes combine, reflect line

Intersection

Parallel curve

Circle - includes corner, connect curve, conic

Spline - includes helix, spiral, polyline

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Surfaces:

Create surface geometry.


WORKBENCH TOOLBARS

Operations:Modify, transform or

extract geometry from

existing elements.

Extrude

Revolve

Sphere

Offset

Sweep

Fill

Loft

Blend

Join - includes healing, untrim, disassemble

Split - includes trim

Boundary - includes extract

Translate - rotate, symmetry, scaling, affinity, axis to axis

Extrapolate

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WORKBENCH TOOLBARS

Replication:

Create several instances

of a wireframe or surface

object.

Constraint

Constraint Dialog Box

Object Repetition - includes points and planes repetition

Pattern - includes rectangular, circular

PowerCopy (advanced replication tool)

UserFeature (advanced replication tool)

Analysis:

Curve and surface

analysis tools.

Connect checker - analyze surface connections

Curve connect checker - analyze curve connections

Constraints:

Apply constraints.

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Additional user tools are available during wireframe

and surface creation.

User tools provide assistance in the geometry creation process.

A user tools icon will be highlighted when activated.

USER TOOLS

Update all

Axis system

Work on support

Snap to point

Select body

Icon activated

(highlighted)

Working supports activity

Create datum

Icon not

activated

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Wireframe and Surface user tools:

Update All

Update design to current specifications.

Axis System creation

Create a local coordinate axis system to work in.

Work On Support Create a surface or planar support element to work on.

Snap To Point

Snap to the nearest grid intersection point when working on a support.

Working Supports Activity Activate or deactivate the current working support.

Create Datum

Create an element without history when this icon is active.

USER TOOLS

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Wireframe and Surface user tools (continued):

Catalog Browser

Create instances from a catalog or from a document (advanced

replication tools).

Select Body Select a body from the pull-down list to make it the In Work body. This

is a convenient method for defining a body as the In Work object.

USER TOOLS

Select the body

Body is now theIn Work object

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In the V5 part structure: Open Body - an open body contains wireframe and surface

geometry created for use in the design of the part.

- accessing the Wireframe and Surface workbench will

create an open body in the specification tree.

Part Body - the part body contains solid geometry features createdusing the Part Design workbench.

WIREFRAME AND SURFACE TERMS

Open body

Part body

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CREATING WIREFRAME GEOMETRY

Points

Lines

Planes

Curves

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Methods for creating wireframe geometry:

Use the Sketcher icon to create geometry located on a 2D

sketch plane.

Use the Wireframe toolbar icons to create geometry that is defined

based on 3D coordinate system parameters or in relation to existing

3D geometry.


Projection curve

Intersection curve

Parallel curve

Point on surface

Point on curve Point

tangent to curveLine tangent to curve

Line normal to surface

Offset PlanePlane normal to curve

Plane tangent to surface

Circle

Connect curve

Spline

HelixWireframe toolbar

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General process


1. Select icon

from Wireframe

toolbar.

2. Select the

definition type

from choices inpull-down box.

3. Select other

geometry (if

necessary).

4. Specify the

parameters.

5. Click Apply

to preview, OK

to accept.

13

4

2

5

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CREATE A POINT

Use the Point icon to create a point located in 3D.

Choose the type of point from the pull-down box.

Choose a new

reference point or

accept the defaultpoint as displayed

Choose the type

of point to define

Note: The reference point is the

origin from which parameter

values are measured.

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CREATE A POINT

Coordinates

Specify point coordinates (x,y,z) from the reference point.

Select an existing point as reference.

Coordinates

of new point

(0, -5, 6)

Reference point

(0, -5, 6)

Reference point

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CREATE A POINT

On curve

Specify location on a curve at a distance from the reference point.

Selected curve

Distance from

reference

Distance on curve

Ratio of curve length

Click for curvemid-point

Click for nearest

curve end-point

Distance as a ratio of curve

length (66% of total length)

New point

New point

Reference point

(green)

Reference

point

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CREATE A POINT

On curve

Additional options

Reverse the measure directionfrom the reference point

Distance along

the curve Distance from

point to point

Specify an existing

point as the reference

Repeat type

Parameters

Add additional points afterthe first point is created

First point

Repeated

points

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CREATE A POINT

On plane

Specify in-plane point coordinates (h,v) from the reference point.

Select an existing point as reference.

(2.5, 4)

Reference point

Reference point

Selected plane

Horizontal

and vertical

coordinates

of new point

Selected

plane

(2.5, 4)

A reference point is

projected onto the plane

if the selected point does

not lie on the plane.

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CREATE A POINT

On surface

Specify the direction and distance from the reference point. Direction can be specified by selecting a line, linear edge, plane or planar

surface. Selecting a plane or planar surface will specify a direction normal

to the plane.

Distance is measured along the surface contour.

Selected

direction (line)

Distance fromreference

New pointSelected surface

Reference point

(surface mid-point)

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CREATE A POINT

Additional options

Create a point between existing points

Create point(s) on a curve tangentto a specified direction line

Create a point at the centerof a circle or an arc

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MULTIPLE POINT CREATION

Use the Points Creation Repetition icon to createmultiple points spaced on a curve.

1. Select

a curve

2. Specify

instances

3. Activateoptions

End points included

in total instances

Points created in a

new Open body

Normal planescreated at point

instances

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CREATE A LINE

Use the Line icon to create a line located in 3D.

Choose the type of line from the pull-down box.

Choose the type

of line to define

Note: Start and End values

of zero (0in) will default to

the selected points.

Specify a start and end

point distance from the

initial points selected

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CREATE A LINE

Point - Point

Create a line between two selected points.

Specify the distance of start and end points from selected points.

Select a support

element for the

line (optional)

Selected points

Key in

distance(s)

New line

or Drag green

arrows at points

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CREATE A LINE

Point - Direction

Specify a start point and direction for the line.

Select a line to

specify direction

New line

Specify start

and end point

distance(s)

Start point

or Select a

plane to specify a

direction normal to

the plane

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CREATE A LINE

Angle / Normal to curve

Specify a start point on a curve and an angle for the line.

Select Normal to Curvefor an angle of 90 degrees

New line

Specify start and end

point distance(s)

Curve lies on theselected support

Start point

Selected

curve

Angle of line measured

from the curve tangent

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CREATE A LINE

Angle / Normal to curve

Special option: Specify an angled line on a supporting surface.

Activate Geometry on supportto create the angled line on the

support surface

Start point

Selected

curve

Selected

support surface

Not activated

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CREATE A LINE

Tangent to curve

Specify a line tangent to a curve starting at a selected point.

New line

Specify start and end

point distance(s)

Start point

Selected curve

Mono-Tangentmode

Line extent is

mirrored on both

sides of start point

Reverse the line

direction from

the start point

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CREATE A LINE

Tangent to curve

Specify a line tangent with two curves using bi-tangent mode.

Other solutions in

blue and numbers

in brackets (#)

Support

element

Current solutionis highlighted

Selectedcurves

Bi-Tangentmode

Multiple solutions

Click Next Solution tohighlight another solution

or Select on the screen

Click OK to

accept

highlighted

solution

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CREATE A LINE

Additional options

Create a line normal to a surface

Create a line bisecting the angle

between two selected lines

No support

elementLine created on

support surface

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Use the Plane icon to create a plane located in 3D.

Choose the type of plane from the pull-down box.

CREATE A PLANE

Specify the

parameters

Choose the typeof plane to define

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Offset from plane

Create a parallel plane offset by a distance from a reference.

Parallel through point Create a parallel plane through a selected point.

CREATE A PLANE

Offset

distance

Reference

plane

Reference

plane

Selected

point

3 in

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Angle / Normal to plane

Create a plane at an angle to a reference plane through an axis.

CREATE A PLANE

Specify angle

Rotation axis

New plane passes

through rotation axis New planeSelect Normal to Planefor an angle of 90 degrees

Drag the green Move symbolto reposition the new plane

Reference plane

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CREATE A PLANE

Through element options

Through two lines

Through a planar curve

Through pointand line

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Normal to curve

Create a plane normal to a curve at a given point.

Tangent to surface Create a plane tangent to a surface through a selected point.

CREATE A PLANE

Plane at

mid-point

(default)

Selected

curve

Selected

point

Selected

surface

Plane at

selected

point

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CREATE A PLANE

Additional options

Create a mean plane through points Create a plane by equation

Ax + By + Cz = D

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Curves generated from

existing geometry

Curves based on

parameters

CREATE A CURVE

Two general methods for creating curves located in 3D: Curves of a certain type based on parameters - examples include a

circle, spline, conic, helix, etc.

Curves generated from existing geometry - examples include curve

projections, intersections, parallel curves, etc.

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Part Arc

Whole Circle

Trimmed Circle

Complementary Circle

CREATE A CIRCLE

Use the Circle icon to create a circle or arc in 3D.

Select limitation

options

Choose the type

of circle to define

Specify start and end limit

angles for a partial arc

Specify

parameters

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CREATE A CIRCLE

Center and radius

Specify center point, support element and circle radius value.

Circlecenter point

Support element

(yz plane)

Key in radius value or drag green arrows

Specify angle limits for a partial curve.

Whole circle option

Part arc

option

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CREATE A CIRCLE

Center and point

Specify center point, support element and a point on the circle.

Circle

center point

Support element

(yz plane)

Part arc option

Point on circle

Angle limits are

measured from

point on circle

Whole circle option

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CREATE A CIRCLE

Two points and radius

Specify two points on the circle, support element and radius value.

Radius value

Trimmed

circle option

Select

2 points

Current solution

is highlighted

Multiple solutions

Click OK to accepthighlighted solution

Click Next Solutionbutton or select another

solution on the screen

Whole circle option

Complementary

circle option

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CREATE A CIRCLE

Bi-tangent and radius

Specify 2 tangent elements, support element and circle radius value.

2 elements(line and point)

Support element

(yz plane)

Circular arc created

(radius = 3.5 in)

Arc tangent to the

line (Element 1)

Arc tangent to the

point (Element 2)

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CREATE A CIRCLE

Bi-tangent and point

Specify a tangent element, tangent curve, point on the tangent curveand a support element.

Tangent element

(point, line, or curve)

Point of tangency

on selected curve

Tangent curve

(line or curve)

Support element

(yz plane)

Arc tangent to

the line (Curve 2)

at selected point

Arc tangent to the

point (Element 1)

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CREATE A CIRCLE

Additional options

Create a circle through 3 points

Create a tri-tangent circle(circle tangent to 3 elements)

C CO

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Use the Corner icon to create a rounded corner

between two elements in 3D.

CREATE A CORNER

Select elements

Specify corner

radius value

Multiplesolutions

Click OK to accepthighlighted solution

Click Next Solutionbutton or select another

solution on the screen

Corner created (no trim)

Elements

trimmed

Activate Trim Elementsoption to trim geometry at

the corner intersections

CREATE A CONNECT CURVE

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Use the Connect Curve icon to create a curve

connecting two existing curves at selected points.

Connect curve key points:

Elements that can be connected are either curves or lines.

Select points to define the connect curve endpoints.

Selected points must lie on the curves to be connected.

Point, tangency or curvature continuity can be imposed at the connect

curve endpoints. Modify continuity tension values to impact the connect curve shape.

Connected elements can be trimmed at the connect curve endpoints.



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General process


1. Select theConnect

Curve icon.

2. Select the

points to be

used as curveendpoints.

3. Click button

to reverse the

continuity

direction.

4. Specify type

of continuity.

5. Choose trim

option Apply.

4

1

2 Selecting a pointautomatically

selects the curve

the point lies on

3

5

Connect

curve No elements

trimmed


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Additional options

Continuous curvature

at the Curve2 point

Tangency

direction

arrow (red)

Tangency

direction

reversed

Activate

Trim elements Elementstrimmed

Reverse Direction of continuity

Imposing Continuity at endpoints

CREATE A CONIC

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Use the Conic icon to create a conic type curve(parabola, hyperbola, or ellipse) in 3D.

The conic curve must lie on a planar support element.

A conic is defined using one of these object sets: Two points, start and end tangents, a parameter value

Two points, start and end tangents, a pass through point

Two points, a tangent intersection point, a parameter value

Two points, a tangent intersection point, a pass through point

Four points, a tangent

Five points

CREATE A CONIC

CREATE A CONIC

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General process

CREATE A CONIC

1. Select

Conic icon.

2. Select the

support plane.3. Select the

two endpoints.

4. Select the

elements used

to definetangency.

5. Specify the

parameter

value Apply.

4

1

2 3

Conic

Also, drag green

arrows to change

parameter value

3

5

CREATE A CONIC

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CREATE A CONIC

Two points, start and end tangents

2 lines selected as

start and end tangents

Support element

(yz plane)

2 points selected

Specify a Parameter value

Select a Pass through point

P = 0.5, parabolaP < 0.5, ellipse

P > 0.5, hyperbola

P = 0.7

CREATE A CONIC

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CREATE A CONIC

Two points, and a tangent intersection point

Point selected as

tangent intersectionfor both tangencies

2 points selected

Specify a Parameter value

Select a Pass through point

P = 0.3

Activate tangent

intersection

point option

CREATE A CONIC

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CREATE A CONIC

Four points, and a tangent

4 points selectedLine selected as

a start tangent

Five points

Select 2 endpoints then

select 3 additional points

Endpoints

Endpoints

CREATE A SPLINE

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Use the Spline icon to create a 3D curve passing

through selected points. Select points in the order that the spline should be constructed.

Points can be added before or after selected points.

Points can be replaced with a different point.

CREATE A SPLINE

Spline is created as

points are selected

Select 1st point

Select 2nd point

Pointoptions

Spline

created

CREATE A SPLINE

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Impose tangency or curvature conditions on the points

that define the spline. Click to highlight the point in the spline definition window.

Impose tangency or curvature on the highlighted point.

CREATE A SPLINE

Click Add Parametersbutton for tangency/

curvature options

Selected point

is highlighted

Tangency and

curvature options

Line selected to impose

tangency on Point.8

CREATE A PROJECTION

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Use the Projection icon to create elements by

projecting existing objects onto support geometry. Points and wireframe geometry can be projected on to a surface.

Points can also be projected onto wireframe geometry.

The projection can be normal to the support or a defined direction.

CREATE A PROJECTION

Support

surface

Curve to be

projected

Curve projected

onto surface

CREATE AN INTERSECTION

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CREATE AN INTERSECTION

Select elements

Specify corner

radius value



CREATE A PARALLEL CURVE

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CREATE A PARALLEL CURVE

Select elements

Specify corner

radius value



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CREATING BASIC SURFACES

From a profile

Sphere

From boundaries

From another surface - offset

Lofted surface

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SURFACE-BASED SOLID FEATURES

From a profile

Sphere

From boundaries

From another surface - offset

Lofted surface

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