1.7.8.2. Loop Subdivide

1.7.8.2.1. Loop Cut and Slide

Reference

Mode: Edit Mode
Panel: Tool Shelf ‣ Tools ‣ Mesh Tools ‣ Add: Loop Cut and Slide
Hotkey: Ctrl-R

Loop Cut splits a loop of faces by inserting a new edge loop intersecting the chosen edge. The tool is interactive and has two steps:

1.7.8.2.1.1. Usage

1.7.8.2.1.1.1. Pre-visualizing the Cut

After the tool is activated, move the cursor over a desired edge. The cut to be made is marked with a magenta colored line as you move the mouse over the various edges. The to-be-created edge loop stops at the poles (tris and n-gons) where the existing face loop terminates.

1.7.8.2.1.1.2. Sliding the new Edge Loop

Once an edge is chosen via LMB, you can move the mouse along the edge to determine where the new edge loop will be placed. This is identical to the Edge Slide tool. Clicking LMB again confirms and makes the cut at the pre-visualized location, or clicking RMB forces the cut to exactly 50%. This step is skipped when using multiple edge loops (see below)

_images/loopcut-before.png

Figure 1: Mesh before inserting edge loop.

_images/loopcut-preview.png

Figure 2: Preview of edge loop location.

_images/loopcut-placement.png

Figure 3: Interactive placement of edge loop between adjacent loops.

1.7.8.2.1.2. Options

The options are available while the tool is in use, and later in the Operator panel.

1.7.8.2.1.2.1. Loop Cut

Number of Cuts Wheel or PageUp / PageDown

After activating the tool, but before confirming initial loop location, you can increase and decrease the number of cuts to create, by entering a number with the keyboard, scrolling Wheel or using PageUp and PageDown.

Note

When creating multiple loops, these cuts are uniformly distributed in the original face loop, and you will not be able to control their positions.

_images/loopcut-multicut.png

Figure 4: Preview of multiple edge loops.

_images/loopcut-multicut-after.png

Figure 5: Result of using multiple cuts.

Smoothing Alt-Wheel

Smoothing causes edge loops to be placed in an interpolated position, relative to the face it is added to, causing them to be shifted outwards or inwards by a given percentage, similar to the Subdivide Smooth tool. When not using smoothing, new vertices for the new edge loop are placed exactly on the pre-existing edges. This keeps subdivided faces flat, but can distort geometry, particularly when using Subdivision Surfaces. Smoothing can help maintain the curvature of a surface once it is subdivided.

_images/loopcut-unsmooth.png

Figure 6: Added edge loops without smoothing.

_images/loopcut-smooth.png

Figure 7: Same edge loops, but with smoothing value.

1.7.8.2.1.2.2. Edge Slide

Even E
Only available for single edge loops. This matches the shape of the edge loop to one of the adjacent edge loops.
Flip F
When Even is enabled, this flips the target edge loop to match.

1.7.8.2.2. Offset Edge Slide

Reference

Mode: Edit Mode
Panel: Tool Shelf ‣ Tools ‣ Mesh Tools ‣ Add: Offset Edge Slide
Hotkey: Ctrl-Shift-E

Add two edge loops on either side of selected loops.