What is Reference Geometry

Reference Geometry is a sketch-element that is copied to the Base-Part of the 'active' 'Reference' Mechanism-Editor from a sketch-element in a different 'Source' Mechanism-Editor.

Nearly always, the two Mechanism-Editors are on parallel Planes, which do not move relative to each other.

The source sketch-element may be on a moving Part. In this case, the motion of the source sketch-element is also copied to the reference sketch-element

Add Reference Geometry

Add Reference Geometry icon

Kinematic Elements Toolbar : Add Reference Geometry [Left of graphic-area]

Menu :

Add menu > Mechanism sub-menu > Add Reference Geometry

What to do :

You need two Mechanism-Editors, which are typically on parallel Mechanism-Planes.

You copy a sketch-element from the Source Mechanism-Editor
You copy a sketch-element to the Reference Mechanism-Editor

If necessary:

Click the Reference Mechanism-Editor
Click Display toolbar > Show / hide Profiles to hide Profile elements. You cannot make a reference copy of a Profile, but you may 'try' to make one.
Use Visibility toolbar > Show other Mechanism Sketches to show sketch-elements in other Mechanism-Editors.
View toolbar > Spin to see the sketch-element in the source Mechanism-Editor

1.Click Kinematic-elements toolbar > Add Reference-Geometry
2.Click a sketch-element [Circle, Arc or Line] in the Source Mechanism-Editor
3.Click OK-tiny-11-15 in the Command-Manager

A copy of the sketch-element that you select in [2], is made in the Base-Part of the active Mechanism-Editor.

The new sketch-element is Reference Geometry.

Do Steps 1 - 3 again and again to copy more sketch-elements.

Video :


'Expand' then 'Play'

How to...

Add Reference Geometry


Preparation :

See Below - More Details

Notes :

You cannot delete or edit a reference sketch-element. You must delete or edit the source sketch-element in the source Mechanism-Editor.
Reference Geometry element names are 'RefLine' or 'RefCircle'.

tog_minusHow to Add Reference Geometry - More Details

You need two Mechanism-Editors.

Mechanism A: The 'source' Mechanism-Editor with the 'source' sketch-element in a Part you want to 'reference'.
Mechanism B: The 'active' Mechanism-Editor to which you want to add the 'source' sketch-element to become 'Reference Geometry'.

Show other PArt-Outlines and Sketches

STEP 1: Make Mechanism 'B' active


STEP 2: Spin the model [keyboard arrow keys] to view the sketch in the Mechanism A.

In the image to the left, the active Mechanism B is in front of the source Mechanism A

You cannot select the grey geometry from Mechanism-A before you start Add Reference Geometry.

Reference Geometry icon

STEP 3: Click Kinematic element toolbar > Add Reference-Geometry



The Command-Manager instruction is:

Add Lines, Circles or Arcs to the active Mechanism with Lines, Circles or Arcs in a different Mechanism.


STEP 4: Click the sketch-element in Mechanism A you want to 'copy' as Reference-Geometry to Mechanism B.


STEP 5: Click OK

The sketch-element shows in the Mechanism B.

Do steps 3-5 again to add more Reference Geometry sketch-elements.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd