When set to Quads, Uniform Spans creates straight line quad strips between the start and end points of the drawn stroke.
Uniform Spans - For curves and polylines, this setting creates a uniform distance between generated vertices, regardless of stroke speed or shape. When set to Quads, this value specifies the number of slices in a polygon strip, so a 16-polygon strip with a slice value of 2, produces 32-polygons > 16 long by 2 wide. Think of it roughly like the distance, in pixels, the pointer travels before creating a new point. Lower values produce strokes with greater numbers of points, higher values produce strokes with lower numbers of points. Sets how finely Modo interpolates the drawn stroke. Right-click in the viewport to interactively set the width value. This setting only affects the Quads type. However, the spans roughly equal those in the initial segment value until changed. This is somewhat like uniform spans, in that subsequent strokes, if longer or shorter, may contain more or less segments. When set to Quads, this value specifies the number of polygons in a segment strip. They provide better continuity than other spline curve types, such as Hermite and Bezier, because they do not go through any of their control points. B-splines are spline curves that are defined by at least four vertices and a Weight Map. B-Spline - The tool creates a B-Spline curve based on the sketch you draw. Bezier - The tool creates a Bezier curve based on the sketch you draw. Quads - The Sketch tool creates a strip of quad (4-sided) polygons, centered along the contour of the sketched curve. 
Lines - The Sketch tool generates a series of 2-vertex polylines that follow the contour of your sketched curve.Face - The Sketch tool creates a polygon by drawing a straight line from the end of your sketch back to the beginning, so as to close the loop.Curve - The default the Sketch tool creates a spline curve based on the sketch path you create.Sketch Tool OptionsĪllows you to choose between the various sketch tool types: In addition, this tool is also found in the Topology layout, under the Tools sub-tab. The Sketch tool can be found in the Model layout, under the Curve sub-tab. With Constrain to Background enabled, the sketch tool is a quick and easy way to add polygons, re-topologizing any background geometry. Strokes can be manipulated by clicking on the plus icon to move the entire curve, while clicking on the dot at the tip allows you to rotate and scale the tip around the base. Strokes, while active, have a couple widgets associated with them: a plus icon at the root, or base, and a small dot at the tip. Use a mouse or tablet to draw the curve and Modo converts your sketch into the curve type you've chosen. To use the tool, click and drag in any 3D viewport. The Sketch tool allows you to quickly create a curve by drawing in the 3D view.
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