how get coordinates AssemblyConstraint in Autodesk inventor API

[kkk_rbhbkkk]

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?

 

[kacper.suchomski]

Hi

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?

[kkk_rbhbkkk]

Hi

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

[Andrii_Humeniuk]

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

[kkk_rbhbkkk]

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

[Andrii_Humeniuk]

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.

[kkk_rbhbkkk]

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

[Andrii_Humeniuk]

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);
        }
    }
}

[kkk_rbhbkkk]

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