Arc 3pt (Curve)

Functionality

This node generates a Curve object, which represent a circular arc, going through the three specified points. The node also outputs key properties of such an arc: center, radius and angle.

See also:

• Curves-> Circle (Curve)

• Curves->Curve Primitives-> Arc Start / End / Tangent

Inputs

This node has the following inputs:

• Point1. The first point to draw an arc through. The default value is (0, 0, 0).

• Point2. The second point to draw an arc through. The default value is (1, 0, 0).

• Point3. The third point to draw an arc through. The default value is (0, 1, 0).

Parameters

This node has the following parameter:

• Join. If checked, the node will output a flat (level 1) list of Curve objects, even if the inputs contain a list of lists of points (level 3 list). Otherwise, the node will output list of lists of Curves in such situation. Checked by default.

• Text-> Stethoscope

Outputs

This node has the following outputs:

• Arc. The arc curve object.

• Circle. A circle curve - the same as in the Arc output, but this curve goes the whole 360 degrees.

• Center. The matrix which defines the location of arc’s center, and the orientation of the arc. The Z axis of this matrix always looks along the normal of the arc plane. The X axis of this matrix always looks towards the first point of arc (one which is provided in the Point1 input).

• Radius. The radius of the arc.

• Angle. The angle of the arc, in radians.

• Text-> Stethoscope

Example of usage

Build an arc via three points, and visualize it’s center matrix:

• Viz-> Viewer Draw

• Viz-> Viewer Draw Curve