Grid Fill

Mode

Edit Mode

Menu

Face ‣ Grid Fill

The best predictable result can be achieved if you select two opposite edge loops with an equal number of vertices. When a single, closed edge loop is selected, the Span/Offset options allows you to adjust the way two opposite edge loops are detected from one closed edge loop.

Span

Specifies the number of columns in the grid.

Offset

Simple Blending

Use a simple interpolation algorithm to generate grid vertices from boundary loops, which does not tries to maintain the shape, useful for flat surfaces or times when keeping the shape gives odd results.