NURBS Arcs NURBS arcs can be created using one of four modes. NURBS Arc by Radius To create a NURBS arc by radius: 1. Click the NURBS Arc tool from the 3D Modeling tool set, and select NURBS Arc by Radius mode. 2. Click to set the center of the arc. 3. Click to fix the radius and set the starting point for the arc. 4. Click to set the end point of the arc. NURBS Arc by Three Points To create a NURBS arc by three points: 1. Click the NURBS Arc tool from the 3D Modeling tool set, and select NURBS Arc by Three Points mode. 2. Click to set the starting point of the arc. 3. Click to set end point of the radius that defines the arc. 4. Click to set the end point of the arc. NURBS Arc by Tangent To create a NURBS arc by tangent: 1. Click the NURBS Arc tool from the 3D Modeling tool set, and select NURBS Arc by Tangent mode. 2. Click to set the start point of the arc. 3. Click to set the tangent. 4. Click to set end point of arc. NURBS Arc by Two Points and Center To create a NURBS arc by two points and center: 1. Click the NURBS Arc tool from the 3D Modeling tool set, and select NURBS Arc by Two Points and Center mode. 2. Click to set the start point of the arc. 3. Click to set end point of the arc. 4. Click to set the radius of the arc.