Change control points coordinates

Aspose.3D Product Family
1

I am trying to manipulate the control points of a mesh. However, trying to set the control points with new X,Y,Z,W data (to override the existing data) fails. The control point still holds its original values.

Code i use :

 For C = 0 To Ms.ControlPoints.Count - 1

            Dim x As Double = Ms.ControlPoints.Item(C).x - Xshift
            Dim y As Double = Ms.ControlPoints.Item(C).y - Yshift
            Dim z As Double = Ms.ControlPoints.Item(C).z
            Dim w As Double = Ms.ControlPoints.Item(C).w

            Ms.ControlPoints.Item(C).Set(x, y, z, w)

 Next

A workaround is create a new list of vector4 , and use the following code, the coordinates gets updated but I have to create the list in memory (which has slow performance) :

Ms.ControlPoints.Clear()
Ms.ControlPoints.AddRange(NewCoordinates)

2

@Geonius

Thank you for contacting support.

Would you please share your source and generated files, if any, so that we may investigate further. Before sharing requested data, please ensure using Aspose.3D for .NET 19.9 in your environment.

3

This is the code i am using, just use an standard fbx :

    Dim scene As Scene = New Scene()

    Dim FBXname As String =  "test.fbx"
 
    scene.Open(FBXname)

    Dim a As Node = scene.RootNode

    For Each cnode As Node In a.ChildNodes

        Dim Ms As Entities.Mesh = cnode.Entity
        Dim BB As Utilities.BoundingBox = Ms.GetBoundingBox()

        Dim Min As Utilities.Vector3 = BB.Minimum
        Dim Max As Utilities.Vector3 = BB.Maximum

        Dim Xshift As Double = Math.Truncate((Max.x + Min.x) / 2)
        Dim Yshift As Double = Math.Truncate((Max.y + Min.y) / 2)

        For C = 0 To Ms.ControlPoints.Count - 1

            Dim x As Double = Ms.ControlPoints.Item(C).x - Xshift
            Dim y As Double = Ms.ControlPoints.Item(C).y - Yshift
            Dim z As Double = Ms.ControlPoints.Item(C).z
            Dim w As Double = Ms.ControlPoints.Item(C).w

            Ms.ControlPoints.Item(C).Set(x, y, z, w)

        Next

    Next


    Dim FBXExportname As String = "export.fbx"

    scene.Save(FBXExportname, FileFormat.FBX7500ASCII)
4

@Geonius

Thank you for contacting support.

We are looking into this and will get back to you soon.

5

@Geonius

Please note that Ms.ControlPoints.Item(C) returns a struct, which is passed by value, any modifications are performed on stack, so Set is not working in this scenario (Just modified a temporary variable on stack), use the following code to modify the Control Points:

For C = 0 To Ms.ControlPoints.Count - 1
Dim v = Ms.ControlPoints.Item(C)
v.x -= Xshift
v.y -= Yshift
Ms.ControlPoints.Item(C) = v
Next

We hope this will be helpful. Please feel free to contact us if you need any further assistance.