The add loop tool is the interactive version of Loop Slice tool. Users can easily add an edge loop at the edge where clicked and then see the pre highlighted polygon loop to slice at the mouse position. Found in the 'Edge' subtab of the modeling toolbox, the following options are possible options are available when the tool is activated-
Add Loop--
Position: The slice position across the entire edge length displayed as percentage. 50% would be the center.
Distance 1/2: The slice position displayed as a numeric distance value from the start (1) to the end (2) of the edge.
Split at the Middle: When enabled, modo will automatically slice at the middle position regardless of where the edge was clicked.
Keep Quads: Forces modo to produce Quad polygons as possible.
Show Position: When enabled, displays a text overlay of the new position as a percentage.
Show Distance: When enabled, displays the distances between the edge positions and the new position as a numeric value.
Absolute Distance: When enabled, the offset of the new loop is defined by an absolute distance instead of as a percentage.
Offset from End: When enabled, allows the offset of the loop from the opposite end of edge. This option is only available when 'Absolute Distance' is enabled.
Both Sides: When enabled, simultaneously slices loop from both sides of the existing loop providing two edge loops.
Preserve Curvature: The new position is computed along a curve through the edges to maintain the overall curvature. Once enabled, the 'Tension' setting becomes available.
Tension: Determines the strength of the curvature preservation. The default value of 100% calculates the curvature similar to a spline generated along the edge's length, placing the new vertex appropriately, where a value of 0% would be like disabling the Preserve Curvature option. Negative values inset the curvature and higher values further offset the vertex out from the curve's position.
