Creating a Curve on Mesh

	This task will show you how to create a curve totally lying on a mesh: you will pick points on the mesh you can change the view orientation while creating the curve, multi-cells meshes are not allowed, you can control the continuity of the Curve on Mesh, you can create a multi-cells Curve on Mesh, you can create a closed Curve on Mesh, some graphical and statistical information are available during creation, the output 3D curves on mesh are features, hence they are associative and editable.
	Split points are the points picked to create the Curve on Mesh. Intermediate points are automatic construction points between the split points. They lie on the mesh and form a scan that is then smoothed to create the curve. Click here for more information on the type of points. Please read the Parameters for Curve on Mesh chapter for an optimal use of the command. This chapter describes: the dialog box of the command, how to create split points and internal points, how to close the curve, how to create a dominant curve section, how to edit the curve as you create it, how holes in the support mesh are managed.
	Open the FreeEdges1.CATPart model the from the samples directory.
	Click `Curve on Mesh` . The `Curve on Mesh` dialog box is displayed. Select the mesh that will support the curve. Multi-selection is not allowed. Multi-cells meshes are not allowed. Its name is displayed in the dialog box and the rest of the dialog box becomes active. The `Curve Optimization` checkbox is selected by default. However, if you have selected a large support mesh, clear this check box to improve performances during the creation of the curve. Note that when this check box is cleared, the order and number of segments of the curve are not optimized and can be equal to the maximum values. Pick points on the mesh to create the curve: The points you pick are the split points of the curve. They are projected on the mesh, along the view direction. Intermediate points are automatically computed between each couple of split points, and the resulting scan is smoothed to create the curve. You can adjust the `Tolerance` of smoothing, as well as the maximum order (`Max. Order`) and maximum number of segments (`Max. Segments`) of the curve. You can also constrain both curve endpoints by picking an existing 3D point, a curve, a plane, or an edge. Click `OK` to create the curve and exit the dialog box.