Projecting Curves or Discrete Polylines

You can project discrete polylines onto a terrain.

  1. From the Create section of the action bar, click Curve Projection .
  2. Select the projection type from the list.
    • Along a Direction. Select an element in the 3D area, or right-click Direction to create one.
    • Normal, that is normal to the support.
      Note: You cannot project a curve or a discrete polyline along the normal onto a cloud of points.
  3. Select the Projected elements (scan or curve).

    Multiselection is available.

  4. Select the Support of the projection (Mesh or cloud of points).
  5. When projecting a curve, specify a Sag value.

    The projected curve is discretized according to the sag value. Each discretization point is projected onto the mesh or onto the cloud of points, and is used to compute the output discrete polyline or curve. The smaller the sag value, the smoother the result.

  6. When the support is a cloud of points, specify the Working distance value.

    This is the distance taken into account around each projected point (point from the discrete polyline, or resulting from the discretization of the projected curve) to compute the output discrete polyline. A higher Working distance means more points in the output discrete polyline.

  7. When projecting a curve onto a mesh along a direction, decide to keep the Nearest solution or all the solutions.
  8. When projecting a discrete polyline onto a mesh along a direction, decide if the output discrete polyline needs to lie on the support or not.

    After the discrete polyline points are projected on the support:

    • If the Scan on support check box is selected, intermediate points are added to make sure the output discrete polyline lies on the support. For example, use this option when projecting a discrete polyline that defines a construction area on a final validated mesh.
    • If the Scan on support check box is cleared, the output discrete polyline is computed from the projected discrete polyline points. It does not necessarily lie on the support. For example, use this option when projecting a discrete polyline representing a characteristic line.
    Note: The discrete polyline projection must remain inside the selected support. Otherwise, the output ends at the last projected scan point, not at the boundary of the support.

  • discrete polylines are created under the name Curve Projection.x.
  • Curves are created under the name Curve.x.