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CAD Forum - Setting the G0, G1, G2 continuity of lofting..
Lofts blend multiple profiles, called sections, and transition them into smooth shapes. Work from a sketch that represents cross-sections of the loft feature and contains sketch sections on separate planes. In addition to sketched profiles, you can select object faces and points to include as loft sections. In the Loft dialog box, the Curves tab allows you to choose the sections to include in the loft. Selected sections are identified as sketches, edges, or points.
The Conditions tab defines boundary conditions for end sections and for outermost rails. Apply conditions to rails of an open section loft that borders adjacent surfaces, or a loft with sections that begin or end at a point.
The boundary conditions control the shape of the loft body near its boundary. In the Transition tab, mapping points, rails, centerlines, and section vertices define how segments of one section map to the segments of the section before and after it. If you select multiple sections on any plane, they must intersect. If more than one loop is in a sketch, first select the sketch and then select the curve or loop. For solid lofts, select closed curves in 2D or 3D sketch, or a closed face loop continuous edges surround a face of a part face.
Point sections must be at the beginning or end of the loft. If more than one loop is in a sketch, first select the sketch, and then select the curve or loop. Upon selecting the centerline, section dimensions display at each endpoint. They provide the area and position relative to the centerline for each selected section. To see whether the centerline is normal to the section, use Area Loft.
The section dimension points to a section that is normal to the centerline. In addition to these two sections, you can add placed sections to define cross-sections that control the shape of the loft. On the Curves tab of the Loft dialog box, click in Sections, and then select, in sequence, the sections you want to blend.
For surface lofts, select open or closed curves in 2D or 3D sketch, or a face loop of a part face. Pause the cursor over an edge in the loop, right-click, and then click Select Other. Cycle through available selections. Or select a set of continuous model edges. Tip: To speed processing, turn off the Preview.
Note: The selected sketch or edge highlights in the graphic. Show Me How to Create a Loft. Create a Centerline Loft. Create a Loft to a Point. Note: When specifying a centerline with a point, the centerline must pass through the point section and near the middle of the neighboring section.
For point sections: Sharp Point. Available only when the beginning or end section is a point. Applies no boundary condition. Enables a direct transition from an open or closed section to a pointed or cone-shaped tip. Applies tangency. Enables the loft section to transition to a rounded, or dome-shaped point. Tangent to Plane. Applies tangency to the point based on a selected plane.
Enables the loft section to transition to a rounded dome shape. Select a planar face, or workplane. Not available for use with centerline.
For other sections and rails: Free Condition. No boundary conditions. Tangent G1 Condition. Available when the section or rail is next to a lateral surface or body, or when the selection is a face loop.
To project a face boundary automatically, in the Application Options dialog box, Sketch tab, select Automatic reference edges for new sketch. Direction Condition. Available only when the curve is a 2D sketch. Measures the angle relative to the section plane. Smooth G2 Condition. Enables curvature continuity for beginning and end loft sections and rails. Create an Area Loft. Parent topic: About Sketched Features.
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