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Attachment, Hinge/Slider, Symmetry, and Sub-Surfaces

Rob McDonald

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Attach Point

Axis OrientationRGB - XYZ

Attach Point,only shown

when selected.(new in v3.9.0)

Every component is attached to(or placed in) the model by locatingits attach point and positioning the

component relative to that point

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Attach to Parent (Comp)

Attachmentindicated by

‘^’in browser

Attachment translates/rotatesthe attach coordinate system

(None means attach toglobal coordinate system)

‘Comp’ attachesto parent’s origin

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Attach to Parent (UW)

U,W coordinatesrun [0,1] along surface ‘UW’ attaches

to parent’s surface

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Rel vs. AbsAttached components always

move when their parent moves.

‘Rel’ sets the position/rotationrelative to the attach point.

‘Abs’ sets the position/rotationin global coordinates.

When ‘Rel’ is selected, changingattachment moves component.

When ‘Abs’ is selected, componentstationary as attachment changes

(sometimes confusing).

Changing between ‘Abs’ and ‘Rel’can be very powerful.

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Attach Pointonly shown

when selected.

Blankshown as

feature line orwhen selected

Blank

‘Blank’ components area way to insert a newcoordinate system.

Useful for positioning,mass properties,

and grouping.

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Hinge (and/or Slider) (new v3.9.0)

‘Hinge’ components area way to add simplemotion to a model.

Children of ‘Hinge’components are forced

attached.

Attach Pointonly shown

when selected.

Hinge Fixed Sideshown as

feature line orwhen selected

Hinge Motion Sideshown as

feature line orwhen selected

Forced attachmentindicated by

‘^^’in browser

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Hinge Motion Control

Activate/Deactivatemotion and limits

Set limits tocurrent position

Set slider rangeto limits

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Hinge Orientation

Orient using XForm

Orient using a vectorspecified in this GUI

Six ways tospecify vector

3D VectorTo 3D Point

To Point on SurfaceAlong Surface U-DirectionAlong Surface W-Direction

Normal to Surface

Reference vectorsets orientation

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Example

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SymmetryComponents can be symmetricabout any plane (XY, XZ, YZ)

or axis (X, Y, Z)of any ancestor

attach point or object.

Global origin is 0

Ancestorsnumbered bygeneration

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SubSurfaces

Subsurfaces arerectangles, ellipses, or lines

defined in (U, W) coordson a surface.

They can representare honored byCompGeom,

CFDMesh, andDegenGeom.

They can be used to modelinlet/outlet BC’s,control surfaces,

material properties, etc.

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Questions?

Practice