Get vector values from view cube Inventor API

[karolis.s]

Hello. 

I need to get / create a UCS based on default TOP value of the view cube. (End Task is to store this matrix to SQL DB and read it from Fusion)

So it means
zVector: normal of kTopViewOrientation
xVector: normal of kRightViewOrientation
yVector: normal of kBackViewOrientation

@kandennti 

I have tried to change camera view, apply it, than read UpVector properties, but I do not get expected values..
I have also tried to simply use  camera.ModelToViewTransformation matrix, but again I do not get expected values mentioned above..

Any ideas? Thank you.

[Andrii_Humeniuk]

Hi @karolis.s . I wrote iLogic code that creates a UserCoordinateSystem in the PartDocument according to the ViewBox coordinates. I hope this example helps you.

Dim oDoc As PartDocument = ThisDoc.Document
Dim oUCSs As UserCoordinateSystems = oDoc.ComponentDefinition.UserCoordinateSystems
Dim oUCS As UserCoordinateSystem
Dim oCamera As Camera = oDoc.Views.Item(1).Camera
Dim oUCSDef As UserCoordinateSystemDefinition
Try
	oUCS = oUCSs("new UCS")
	oUCS.Transformation = oCamera.ModelToViewTransformation
Catch
	oUCSDef = oUCSs.CreateDefinition()
	oUCSDef.Transformation = oCamera.ModelToViewTransformation
	oUCS = oUCSs.Add(oUCSDef)
	oUCS.Name = "new UCS"
End Try

[Michael.Navara]

Try this code

Dim cam As Camera = ThisApplication.ActiveView.Camera

cam.ViewOrientationType = ViewOrientationTypeEnum.kRightViewOrientation
Dim x As Vector = cam.Target.VectorTo(cam.Eye)

cam.ViewOrientationType = ViewOrientationTypeEnum.kBackViewOrientation
Dim y As Vector = cam.Target.VectorTo(cam.Eye)

cam.ViewOrientationType = ViewOrientationTypeEnum.kTopViewOrientation
Dim z As Vector = cam.Target.VectorTo(cam.Eye)


Logger.Debug("x = [{0:N2}, {1:N2}, {2:N2}]", x.X, x.Y, x.Z)
Logger.Debug("y = [{0:N2}, {1:N2}, {2:N2}]", y.X, y.Y, y.Z)
Logger.Debug("z = [{0:N2}, {1:N2}, {2:N2}]", z.X, z.Y, z.Z)

[karolis.s]

I have tried this method, it was the closest I could to the end result.. But Z axis is flipped on the part where origin is similar to wanted end result.. 

  

And if origin Z axis is looking to other direction than top I get totally wrong output..

  

[karolis.s]

Thank you for your time.

This way is also not giving me end result

[Michael.Navara · Accepted solution]

I depends on how you create the UCS

In my opinion it works as expected

Dim part As PartDocument = ThisDoc.Document
Dim cam As Camera = part.Views(1).Camera

cam.ViewOrientationType = ViewOrientationTypeEnum.kRightViewOrientation
Dim x As Vector = cam.Target.VectorTo(cam.Eye)

cam.ViewOrientationType = ViewOrientationTypeEnum.kBackViewOrientation
Dim y As Vector = cam.Target.VectorTo(cam.Eye)

cam.ViewOrientationType = ViewOrientationTypeEnum.kTopViewOrientation
Dim z As Vector = cam.Target.VectorTo(cam.Eye)


Logger.Debug("x = [{0:N2}, {1:N2}, {2:N2}]", x.X, x.Y, x.Z)
Logger.Debug("y = [{0:N2}, {1:N2}, {2:N2}]", y.X, y.Y, y.Z)
Logger.Debug("z = [{0:N2}, {1:N2}, {2:N2}]", z.X, z.Y, z.Z)

'Create UCS
Dim origin As Point = ThisApplication.TransientGeometry.CreatePoint()

Dim mtx As Matrix = ThisApplication.TransientGeometry.CreateMatrix()
mtx.SetCoordinateSystem(origin, x, y, z)

Dim ucsDef As UserCoordinateSystemDefinition = part.ComponentDefinition.UserCoordinateSystems.CreateDefinition()
ucsDef.Transformation = mtx

part.ComponentDefinition.UserCoordinateSystems.Add(ucsDef)