Aligning with RPS

You can reposition a cloud of points or mesh (digitized using RPS) with respect to reference elements, using RPS.

Before you begin: Align with RPS requires you have access to Digitized Shape Preparation.
See Also
Aligning Clouds with Constraints
Aligning using the Robot
Aligning a Cloud Using the Previous Transformation
  1. Select a geometrical set as Define In Work Object to store the output.
  2. From the Digitized Data section of the action bar, click Align with RPS .
  3. Select the Cloud to Align (this is the cloud or mesh to reposition).
  4. Use Hide/Show as required.
  5. Click Add to define a first constraint by pairing two elements, one on the cloud to align, the second on the reference.
    1. Select a point on the cloud to align then a point on the reference.

      The reference elements can be a set of clouds or meshes, surfaces, or a set of points.

    2. In the dialog box, place your cursor on the line of this constraint and click under X, Y, Z to freeze or unfreeze those axes.
  6. Define a second constraint, then a third constraint (until the light is green).

    The colors of the constraint elements picked change:

    • A color is associated to each couple of constraint elements that define a constraint.
    • The point selected on the cloud to align is displayed as a dot.
    • The point selected on the reference is displayed as a cross.
    • Another color is associated to the next couple of constraint elements.

  7. Decide to keep the initial cloud or not.

    By default, the Keep Initial check box is selected:

    • The initial cloud to align is kept as such.
    • A copy of this initial cloud to align is made and appears in the tree.
    • This copy is aligned with the references.

    1. Clear this check box if you do not want to create a copy of the initial cloud to align, for example because of its size. The initial cloud to align itself is aligned with the references.

      Note: To avoid inconsistencies, you cannot clear the Keep Initial check box in the following two cases:
      • When the geometry of the cloud to align is shared by other cloud elements, for example when the cloud to align shares points or vertices with another cloud without any parent/child relationship between them.
        Note: Clearing the Keep Initial check box moves the other cloud together with the cloud to align.
      • When the cloud to align is a feature, for example a Generative Shape Design transformation feature.

  8. Click Apply to start the alignment.
  9. Click More to display the Statistics.
    • Alignment #1 indicates this is the first computation you have launched since you have opened the dialog box.
    • For each constraint (for example RPS1) is given:
      • The name of the constraint elements selected RPS Mesh.1/RPS Ref.1.
      • The distance (X: 1.49214e-013) between the constraint element on the cloud to align and the constraint element on the reference along the frozen axes.
      • not frozen means that the corresponding axis is not frozen.

  • If Keep Initial is selected, a new cloud, in fact the copy of the initial cloud to align, is created, and aligned with the references. The new cloud has the same graphic properties as the initial cloud to align.
  • If Keep Initial is not selected, the cloud to align is aligned with the references and no new cloud is created.
  • In both cases, an Axis Systems is created with an AxisRef.x (system axis computed on the cloud to align) and an AxisTrs.x (axis system created on the output cloud).
  • Those Axis Systems can be used with the Axis to Axis action on other elements to align.
  • Align with previous transformation is also available.