Direction of Extension of Rib

Direction of Extension of Rib

Extension of a contour can be carried out in two directions:

•In the contour plane  

•Perpendicular to the contour plane

Direction of Extrusion of Rib

The contour can be extruded in two directions:

•In the contour plane (the rib surface is formed by the extension of the contour in the direction of its plane).

•Perpendicular to the contour plane (the rib surface is formed by the extension of the contour in the direction perpendicular to its plane).

To choose the method of contour’s extension it is required to use the General Parameters tab of the command’s parameters window.

Direction of contour extension is displayed in the scene as arrow-manipulator.

Contour Direction for a Straight Segment

If forming contour is specified by a straight segment, its positioning plane is determined automatically by the following rule. If segment presents part of a profile, system will use plane of the profile creation. If segment presents part of a path, positioning plane is defined by rotating the segment in global coordinate system to the nearest plane the segment coincides.

Contour extension direction is created according to the determined positioning plane.

To select contour extension direction manually, you need to use option:

Next you need to select an auxiliary element. If you select object that specifies plane – face, workplane, etc., then the direction will be a normal to this plane. Alternatively, you can select object that specifies direction – edge, coordinate axis, etc.

Specified contour extension direction will affect all selected contours defined by the straight segments.

To cancel direction selection use option:

Direction to Solid

In addition to contour extension direction, you can specify direction to solid. It determines which part of the half-space, created by contour, will be transformed into the rib.

Special manipulator is used to specify direction to solid. It indicates direction inside the rib body from the point located on the contour. If contour is open, the point is located in the center of the contour line. For closed contour, the point position is chosen arbitrarily. For convenience you can move this point along the contour.

Direction to solid can be defined individually for each contour. To change direction you need to move the manipulator, pulling one of its arcs.

The manipulator allows you to set the direction to solid manually. Thus, system does not need to determine correct direction automatically.

After the operation creation, all space between the walls of the source body and the contour in determined direction is converted into the solid rib of specified thickness.

1. Point

2. Direction to solid body

3. Manipulator arcs

Thickness of rib

When forming a rib, new solid material is added in the direction perpendicular to contour extension plane.

The value of thickness can be specified in appropriate field of the «Main Parameters» tab of the command’s parameters window or by means of manipulator.

The direction of thickness adherence must also be specified for a rib:

•Forward direction. Direction coincides with the direction of the normal to the contour’s plane.

•Back direction. Direction is opposite to the direction of the normal to the contour’s plane.

•Symmetric. Thickness is added to the rib equally in both directions with respect to the plane of the contour.

Direction of thickness adherence can be selected from the drop down list on the General Parameters tab:

In case if the specified value of the thickness parameter becomes larger than the value of the contour’s length, the corresponding field will be renamed to Height.