Constrain two Vertexs in assembly

[johnster100]

Hi,

I am trying to constrain two edges together. My first constraint takes the two edges and and mates them. This works fine.

I then try to constrain the end of the edges together using the StopVertex and StartVertex as the points for mating:

Dim oVertex1 As Inventor.VertexProxy
Dim oVertex2 As Inventor.VertexProxy
oVertex1 = oEdge1.StopVertex
oVertex2 = oEdge2.StartVertex

oAssyCompDef.Constraints.AddMateConstraint(oVertex1, oVertex2, 0)

oEdge1 and oEdge2 are edge proxies and behave as normal when I mate them.

The code always crashes inventor on the 'addmateconstraint' when I try to mate the vertexProxies

Any ideas what I'm doing wrong?

thanks,

John

[JaneFan · Accepted solution]

Hey John, 

I don't see anything you did wrong. I performed the steps you described with local model and the constraint can be created successfully:

Create a mate constraint with two edge proxies, then create another mate constraint with the vertex proxies: 

Dim topAssy As AssemblyDocument
Set topAssy = ThisApplication.ActiveDocument

Dim oE1 As EdgeProxy
Dim oE2 As EdgeProxy
Set oE1 = topAssy.SelectSet(1)
Set oE2 = topAssy.SelectSet(2)

Call topAssy.ComponentDefinition.Constraints.AddMateConstraint(oE1, oE2, 0)
Call topAssy.ComponentDefinition.Constraints.AddMateConstraint(oE1.StartVertex, oE2.StopVertex, 0)

What version of inventor you are using? Would you please try the same steps with creating mate constraint with two simple blocks? 

[johnster100]

thanks,

that worked.

I had a changed a parameter in the model and this was causing the crash during the constraint operation

[JaneFan]

Hey Jon, 

Glad it worked. It would be very helpful if you could send crash report with steps if you met it again. Thank you.