Constraining a surface through a curve

In this task you will apply a controlled modification to a surface by applying the Passing Through Curves constraint of the Advanced GSM command. You can accomplish this task by opening file "ThroughCurves.e3".

1	Start the Advanced GSM command. Under Entities to Be Modified, set Entities to Surfaces and select the surface.
2	Under the Preserving node, in the Preserving drop-down list select Curves. Click on the curves to be preserved: in this case, the surface boundary. In the Constraint drop-down list, select the constraint to be applied along the curves to be preserved (position, tangency, curvature or projection — to avoid changes along a select direction). In this case, select Keep position.
3	Under Passing Through, set Passing Through to Curves and select the curve you want the resulting surface to be through.
4	In the Projection type drop-down list, you can select the projection to be used in the controlled modification: Normal the curve will be projected normally onto the surface. Flat the curve will be projected onto the surface using a linear projection along a specified direction. Single curvature the curve will be projected onto the surface using a cylindrical projection for which you will have to specify the axis. Double curvature the curve will be projected onto the surface using a spherical projection for which you will have to specify the center. In this case, select Normal.
5	In the Constraint drop-down list which shows up on the model, you can choose the continuity constraints to be applied along the curve the resulting surface must be through: position, tangency or curvature. In this case, select Target position. Click the Preview button () to assess the result.
6	Click or to confirm your selections and modify the shape of the surface.