Tool >> Remove Undercut Region  

• Tool >> Remove Undercut Region command finds vertices at the undercut region using given projection vector and deletes them. Undercut means a part of mold or cast which deviates from a sloping or vertical surface and turns back onto itself. It should be removed.

Step

Execute Tool >> Remove Undercut Region command as follows.

1. Select Tool >> Remove Undercut Region from the menu.

2. The following dialog box appears:

Projection Vector is used to define the undercut region. You may directly specify its X, Y, Z components in the boxes. Or if you click Estimate, a projection vector that minimizes the projection area will be automatically calculated. If From Ref. Vector is clicked, you need to pick a reference vector as the projection vector.

When handling close model, you need to check on Closed Model (Bidirectional Searching). If one shell among multiple selected shells is closed model, this option is automatically checked. If Calculate Quickly and Approximately is checked, tolerance check won't be executed and undercut region will be roughly decided. It is much faster and the result doesn't differ too much.

Tolerance is used to determine if one region is undercut region and how it should be modified.

To remove undercut region, the vertices at that region should be pulled outward. This direction is Block-out Direction. If Outside is selected, one undercut vertex will be pulled along the direction of the vector that is perpendicular to the projection vector and points from the center to the vertex. If Vertex Normal is selected, one undercut vertex will be pulled along the direction of its normal vector.

3. If Preview is clicked, the undercut region will be selected. If Remove is clicked, the undercut region will be removed. If Close is clicked, the current operation will be cancelled.