Auto reverse face in Sketchup

When many faces of the group are reversed face, if you do it manually, you have to reverse each side, so it takes a long time to do this, so use an automatic tool. In SketchUp, every face has two sides: the front (white) and back (blue), and the convention is to keep the white front facing outward and the blue back facing in. The trouble is that SketchUp’s own context-menu Reverse Faces only flips what you have selected, and Orient Faces floods from one correct face but stops dead at any edge that isn’t cleanly shared between two coplanar faces — so on imported, exploded, or messy geometry it leaves random blue faces behind. An automatic reverse tool walks every face in the group and flips only the inverted ones in a single pass, which is why it is far faster on a whole group.

Getting this right is not just cosmetic. 3D-print slicers read a reversed face as a hole or as inside-out wall, so a model that looks fine on screen can fail to be watertight on export, and most render engines (V-Ray, Enscape, etc.) shade faces single-sided — a back face often renders as a black hole or simply drops the material you applied to the front. Fixing orientation before you texture or export saves a lot of rework. Note this is still SketchUp 2026 behavior; the front/back face model has not changed across versions.

Video tutorial:

Steps by steps:

• Select the group containing the face to be reversed – click auto reverse tool
• All faces are quickly reversed