The various Bezier curve mode options available are:

• Add - the default mode; when you click in the viewport, additional points are added to the curve. At each control point, position two handles that extend out and allow you to adjust the curvature of the curve segment between vertices. While drawing, you can hover over any point or handle. Where it turns yellow, you can then click and drag the control point or handle to further edit the curve. Control points may be added mid-curve by selecting the preceding control, highlighting it yellow, and clicking the position where the new control point is desired (point order is defined by the initial order in which the curve was created, press the F key prior to activating the tool to invert the order).

• Edit - in Edit mode you can freely click and drag any of the control points or handles along the curve to change the look to the desired shape. While pressing the Ctrl key, you may break the tangency of the control handles, allowing for sharp corners.

• Delete - in Delete mode, you can click on any control point along the curve to remove it from the bezier.

If you want finer point control, you can assign specific XYZ values in these input fields for the currently-selected (highlighted) control point.

The orientation of the extruded geometry is determined by the orientation of the initial polygon, and the Align options, if enabled. The Bank Angle option provides you an additional control, per path vertex, for banking or angling the extrusion from side to side. Bank value then smoothly blends with the values of the previous and later control point positions.

If you want finer handle control, you can assign specific XYZ values in these In and Out input fields for the currently-selected (highlighted) control point.

For each path position, a bank angle can be defined that controls the rotation angle of elements cloned through that position.

The Twist option works just like the Bank Angle option, but instead of being calculated per knot, the rotation amount is defined across the entire length of the curve, where the Twist value represents the amount of twisting rotation from the first knot in the curve to the last knot.

The Closed toggle option adds an automatic curve segment between the first and last control point positions, producing a closed extrusion.

When the By Length option is enabled, segments of the extrusion are evenly distributed along the path by equal lengths rather than by the span (space between control points), which may produce uneven segments.

When the Create Polygon option is enabled, dropping the tool leaves the Bezier Curve path instead of removing it from the scene. This is useful should you wish to use the resulting curve for additional purposes.

If the Create Polygon option is enabled, this toggle activates auto-generation of UV texture coordinates along the curve. The generated UV values are of a single vertical line ('V' axis in UV), positioning all the control point vertices evenly between 0 and 1. For example, this can be useful for applying a Gradient to a rendered curve (the Render Curves option is available in the Mesh Item properties.

When the Automatic option is enabled, Modo assign the number of segments to the path based on the number of control points combined with the Smoothing Angle option. This method bunches-up the most segments around the curvy areas, and produce fewer segments on the straight areas of the curve, which may be desirable. For even spacing of segments, enable the By Length option, above, and disable Automatic.

Available only when Automatic is disabled, this option allows you to specify an exact number of segments along the path.

When the Automatic toggle is enabled, the Smoothing Angle determines the distribution of the segments along the curve. Smaller values produce more segments, and larger values reduce the number of segments. The Smoothing Angle basically defines what the difference between two positions along the curve is, if the next positions falls within the Smoothing Angle threshold, a new segment is generated.

This option, when enabled, changes the orientation of the segments along the curve. The first segment retain its original orientation and subsequent segments be angled away from the first based on the changing (vector) angle of the Bezier Curve.

When this option is enabled, Modo tries to align the direction of the source objects to a straight up position before cloning the source item(s). If the item is already upright when cloned, this option likely has no effect.

By default, Modo clones items at the actual World Position along the Bezier Curve. When the Start at Source option is enabled, Modo offsets each cloned item the distance between the source items center point and the first curve point, producing an effect as if the curve were initiated precisely at the center of the first source item.

This pop-up control allows you to choose between the U or V axis when placing auto-generated UV values for the newly created geometry.

Reverses the normal facing direction of the polygons generated by the extrusion. This is useful for when the extrusion travels along a negative axis causing inside-out geometry.