topic Re: how get coordinates AssemblyConstraint in Autodesk inventor API in Inventor Programming Forum

how get coordinates AssemblyConstraint in Autodesk inventor API

kkk_rbhbkkk — Thu, 08 Jun 2023 12:30:07 GMT

Greetings. I wanted to ask if there is any way to get the coordinates of the middle point of the constraint as in the figure?

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

kacper.suchomski — Wed, 07 Jun 2023 14:05:07 GMT

You can simply measure the distance of the cylinder (axis) from any construction plane (assuming the plane and axis are parallel, of course).
Do you have something else in mind?

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

kkk_rbhbkkk — Thu, 08 Jun 2023 12:29:07 GMT

I apologize. You must have misunderstood. I have an assembly that was not created by me. I need to find the coordinates of all the x,y,z points where the parts of this assembly were connected. Using the Autodesk Inventor API

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

Andrii_Humeniuk — Thu, 08 Jun 2023 13:28:23 GMT

Hi @kkk_rbhbkkk . This is an example of how to get axis coordinates in MateConstraint:

Private Sub Main() Dim oDoc As AssemblyDocument = ThisApplication.ActiveDocument Dim oMT As MeasureTools = ThisApplication.MeasureTools Dim oUOfM As UnitsOfMeasure = oDoc.UnitsOfMeasure Dim oCstrs As AssemblyConstraints = oDoc.ComponentDefinition.Constraints For Each oCstr As AssemblyConstraint In oCstrs If oCstr.Type = ObjectTypeEnum.kMateConstraintObject Then Dim oAxis As WorkAxisProxy If oCstr.EntityOne.Type = ObjectTypeEnum.kWorkAxisProxyObject Then oAxis = oCstr.EntityOne Else If oCstr.EntityTwo.Type = ObjectTypeEnum.kWorkAxisProxyObject Then oAxis = oCstr.EntityTwo End If If oAxis IsNot Nothing Then Dim dX, dY, dZ As Double dX = Abs(oUOfM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.X, kCentimeterLengthUnits, oUOfM.LengthUnits)) dY = Abs(oUOfM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.Y, kCentimeterLengthUnits, oUOfM.LengthUnits)) dZ = Abs(oUOfM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.Z, kCentimeterLengthUnits, oUOfM.LengthUnits)) MessageBox.Show("X - " & dX & vbLf & _ "Y - " & dY & vbLf & _ "Z - " & dZ & vbLf, oCstr.Name) End If End If Next End Sub

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

kkk_rbhbkkk — Thu, 08 Jun 2023 15:39:09 GMT

Thank you. Is this method suitable for other types of constraints?

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

Andrii_Humeniuk — Thu, 08 Jun 2023 15:48:48 GMT

This method is suitable for any cases, if it is adjusted. In this case it is set to look for a MateConstraint, and if it has at least one axis it measures relative to the center of the assembly as per your question and the screenshot.

If the answer was useful for you and solved your question, please mark it as "SOLUTION", it will be useful for other users. Thank you.

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

kkk_rbhbkkk — Thu, 08 Jun 2023 17:35:24 GMT

Sorry. I probably misunderstood something, but when migrating to C#, I get errors. EntityOne has no Type property. And from the code we get coordinates abs, although relative to general coordinates the constraint can be in negative coordinates

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

Andrii_Humeniuk — Fri, 09 Jun 2023 06:00:17 GMT

A simple way to solve this problem:

MeasureTools oMT = m_InvApp.MeasureTools; UnitsOfMeasure oUOM = oAsmDoc.UnitsOfMeasure; AssemblyConstraints oCstrs = oAsmDoc.ComponentDefinition.Constraints; foreach (AssemblyConstraint oCstr in oCstrs) { if (oCstr.Type == ObjectTypeEnum.kMateConstraintObject) { WorkAxisProxy oAxis = null; try { oAxis = oCstr.EntityOne as WorkAxisProxy; } catch (Exception) { try { oAxis = oCstr.EntityTwo as WorkAxisProxy; } catch (Exception) { } } if (oAxis != null) { double dX, dY, dZ; dX = oUOM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.X, UnitsTypeEnum.kCentimeterLengthUnits, oUOM.LengthUnits); dY = oUOM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.Y, UnitsTypeEnum.kCentimeterLengthUnits, oUOM.LengthUnits); dZ = oUOM.ConvertUnits(oAxis.Line.Evaluator.RangeBox.MinPoint.Z, UnitsTypeEnum.kCentimeterLengthUnits, oUOM.LengthUnits); MessageBox.Show("X: " + dX + "\nY: " + dY + "\nZ: " + dZ, oCstr.Name); } } }

Re: how get coordinates AssemblyConstraint in Autodesk inventor API

kkk_rbhbkkk — Fri, 09 Jun 2023 11:40:22 GMT

Hello, this method is not correct because oAxis = oCstr.EntityOne as WorkAxisProxy Is always an object of the kFaceProxyObject class. And when I try to transfer them to WorkAxisProxy I get an error