You can make subtle changes in the shape of a curve or surface by moving the location of its control points. Rhino offers many tools for editing control points. Some commands such as Rebuild, Fair, and Smooth offer some automated solutions for redistributing control points over a curve or surface. Other commands, such as control point dragging and nudging, MoveUVN, and HBar let you manually control the location of individual or groups of control points.

Adding control points to a curve gives you more control over the shape of the curve. Manipulating control points also lets you remove kinks, make curves uniform, and add or subtract detail. The Delete key erases curve control points. This changes the shape of the curve.


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Edit points are like control points except they are always located on the curve and moving one edit point generally changes the shape of the entire curve (moving one control point only changes the shape of the curve in a sub region). Edit points are most useful when you need a point on the interior of a curve to pass exactly through a certain location. Control point editing is preferred when you need to change the look of a curve and maintaining "fairness" is important.

Cut and switch edit points appear as dotted lines. These are through edits (in which the video or audio content on either side of the edit point is continuous). In the case of multicam editing, through edits indicate that the content on either side of the edit point comes from the same multicam clip. A gray dotted line indicates that different angles from the same multicam clip are on either side of the edit point. A white dotted line indicates that the same angle is on either side of the edit point.

In the case of video-only or audio-only cuts and switches, the edit point can be mixed (with both gray and white dotted lines). For example, when you cut and switch video only, you see a gray dotted line for the video and a white dotted line for the audio.

When you move the pointer over a multicam through edit, the pointer changes to the Trim tool, indicating that the edit will be a roll edit (because any other type of edit breaks the relationship between the clips on either side of the cut and switch edit point in the timeline).

Select points around the region to be merged or capped, otherwise select the entire surface(s) to carry out all steps together, producing a single closed object . Create > Surface > Loop triangulation can be used with this function to complete the merging process.

Enter a Filter distance. This specifies a maximum distance deviation from the line for which points are retained. As the distance gets smaller, more points are retained and fewer are removed from the line.

The point variable object represents a single point in the dataset. Each of the point's attributes are accessed by using the defined character, in this example it has been set as 'p.', followed by.'' where '' is the attribute you wish to access. Alternatively, map style p[''] can be used, which allows for names which include spaces. The value can now be assigned or read using the same syntax as a regular JavaScript variable.

The 'var' keyword will create a locally scoped variable which will last for the processing of a single point. This avoids having to create attributes which will only be needed for a single operation. JavaScript variables are dynamically typed, meaning the data type does not need to be specified.

The colour of a point can be changed by adjusting the colour values by setting the Red, Green and Blue attribute values of the required point. The RGB values can be set from 0-255 and will return >255 if they are out of bounds.

This must be done outside of any guards, such as if or while statements, since it will need to be applied to every point before processing. It's also recommended to declare any new variables at the top of your script.

I have a blue curve and cyan curve in the attached file. The blue curve is a MorphControl for the surface. Both curves have the same structure.I want to amend XY locations of each point on the blue curve to the XY locations of the Cyan curve, for each associated control point. Below is my isolated example.

I thought I knew how to do this, I hold alt and I lasso select from right to left from the end of the range to the start of the range, but this only selects the last and first edit points of that range.

This how-to will step through editing Blueprint Spline Component curves while they are in the Level Editor. Blueprint Spline Mesh Components can also be set so they can be edited in the Level Editor, but only have two points to use, and you cannot add any more points.

Surfaces > Blend Surface: This makes a smooth connection between two surfaces. You can adjust the curvature or bulge by pulling at the control points. You can see a preview via the dialog box and do adjustments.

If you want to cut a curve in separate parts you will have to define the point where the curve has to be cut. This can be done by defining a point on the curve or one could use a cutting line. However defining a point on a surface is useless if it has to be cut. However a line can also be used as a cutting line on a surface. The line should define a closed area on the surface or a segment on the surface. Once the curve is defined you can use the Split or Trim function to cut out a part of the surface.

Edit > Trim: Removes selected parts of your surface. Edit > Split: The same as trim, but does not remove any geometry. Surfaces > Surface Edit Tools > Untrim: To undo the trim operation on a surface. First explode the surface to generate single surfaces!

Note: If you need to node edit an object that is part of a group, explode the group first (Modify / Explode). For an object that is part of a block, you can node edit the object in Edit Content mode.

Note: If the two endpoints of the polyline share the same location, the object will simply be closed geometrically. If you simply snap the endpoints of a polyline together, the resulting object will only appear to be closed but is still considered open. This means, for example, that the object cannot be filled with a hatch pattern. In order to geometrically close the object, you must use this feature.

Deletes nodes from lines and line segments, including objects created with double lines and multi-lines. You can also delete nodes from Bezier curves, splines, and sketches. You cannot delete a node that is needed to define an object as a line segment or polygon. This means that you cannot delete the endpoint of a single line segment, and you cannot delete any node of a triangle. If you delete the endpoint of a polyline, you will delete the entire line segment that terminates at that point.

Splines are created by specifying either a series of fit points (points through which the spline passes) or control points (guide points). For either type of spline, you can view and move both types of points. It is easier to understand the types of points when the spline is displayed with its frame. Open the spline's Properties to the Curves page and check Show Frame.

For Bezier curves, you can choose to have additional control while node editing. By checking Show additional control points in the curve's Properties, you can add two more control nodes at every node.You can also control the tangency at each node.

Inkscape can expand and contract shapes not only by scaling, but also by offsetting an object's path, i.e. by displacing it perpendicular to the path in each point. The corresponding commands are called Inset (Ctrl+() and Outset (Ctrl+)). Shown below is the original path (red) and a number of paths inset or outset from that original:


Notice at the bottom of the screen you will see the command line. You can actually draw in LibreCAD using commands that you type into this area. We will use this in a later lesson - to get you familiar with using the command line. Sometimes LibreCAD waits for special input: you should select an object or set a point. Look in this area, most of the time LibreCAD writes down here what it wants.

In the diagram I marked point P_1 first, then drew a line to P_2. The coordinate window gives its absolute coordinates: X=60, y=50 in Cartesian coordinates and a distance of 78 and angle of 38 in polar coordinates. P_1 is the reference point for the relative coordinates, visible as a small red cross. The distance between P_1 and P_2 is 40, the angle 180.

There is one caveat: in the moment when second point P_2 was defined the line is drawn. But the relative origin remains on P_1. It jumps to P_2 when you move the mouse away from P_2, a mouse click is not required in this case. 

You observe the same behavior after choosing Draw / Points. You define a new reference point by mouse click. It is the new relative center after mouse is moved after the click.


We have drawn our work and now we need to add dimensions and text. First of all, let's look at dimensioning a drawing. It would also at this point select edit then current drawing preferences and then dimension and make sure the text height is 2.5 and if it is not, then change it to 2.5 and click ok.

Dimensioning the diameter of the circle is done the same way as the radius. I want you to do that now by yourselves. Again, this is good practice and kind of a self-test to check how you are doing. You can use the dimensioning a circle as kind of a guide if you get stuck (just remember that when it says radius, to substitute the word diameter). Go ahead and try it now.One other point I want to make here on dimensions. You can change the color of your dimension if needed. You do this by clicking modify on the on the menu bar on top and then clicking properties. Put the crosshairs over the dimension and click. A box will pop up and it has a pull down menu under color that will do that for you. Just click on a color and then ok and you will see the new color on your dimension. To change a dimension height, then click on edit on the menu bar and choose drawing preferences. Click the dimension tab and change the height area by typing in a new value. Then you click ok and the dimension size will change. be457b7860

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