Just like spline tolerance, you can also control the curvature of a spline tightly using the start and end tangency options discussed in the following example:
- Start the Spline Fit command again and click on a point to start this spline. Now, select the start Tangency option from the command line:
Figure 8.52: Start Tangency subcommand in the SPLINE command
- Click on another point in the drawing area to specify the direction of tangency.
- Keep clicking on other points in the drawing area to make the spline, you will notice that the starting segment of the spline will become tangent to the direction we specified in the previous step. The tangent direction is shown by the green dash line in the following diagram.
- In a similar way, you can specify tangent direction at the end point of the spline. Select end Tangency from the command line and then click at a point to specify the tangent direction. The spline command will end automatically after you specify the end direction.
Figure 8.53: Starting and end tangency directions defined by the green dashed lines on the spline
In our example, we started from the first point of spline and then clicked along the green dashed line A for the starting direction of the spline tangent. For the end tangent direction, we clicked along line B and the end segment will become tangent to the green dashed line B. The dashed line A and B are not part of the spline and they are added only for representation purposes.
So, these were some options related to Spline Fit. Now, let’s now discuss the options related to Spline CV.