Tool Palettes Surface Edit > Orientation > Unify Surface Orientation > To unify the normal direction on a number of surfaces

Surface Edit > Orientation > Unify Surface Orientation

Forces all surface normals to point in one direction.

See Make all normals consistent

See Prepare a model for import into CAD systems

Modifies a collection of patches so that all normals across a set of adjacent surfaces point in the same direction. This helps to ensure that lighting is correct in renderings, and is also useful when modeling, and offsetting surfaces.

Construction history is preserved during this operation.

To unify the normal direction on a number of surfaces

Choose Surface Edit > Orientation > Unify Surface Orientation .

You are prompted to:

Select input surfaces. When finished, click `Classify'.

Pick all the surfaces to be unified, and then click the Classify button in the lower right corner of the active window.

Based on the Topology Distance tolerance value (set in Preferences > Construction options , under the Tolerances: Topology sub-tab), the surfaces are grouped into sets of adjacent patches. Each set consists of those surface patches that are within the Topology Distance tolerance. The sets are drawn in different colors to help differentiate them.

An arrow shows the direction of the unified surface normal on each set. To change the direction of the surface normal, click on it.

When all surface normals are pointing in the correct direction, click the Unify button.

You can continue changing normal directions, then clicking Unify again, until you select another tool.

Unify Surface Orientation is a continuous function. To finish using this tool, select another tool.