This command inverts the direction of the normal vectors of a curve, surface or solid object.

Inline mode usage:

invertNormals -h
Displays the help file that summarizes the parameters for this command.
invertNormals -all
Invert the normal vector of all objects.
Invert normals by selecting objects on screen.
Interactive mode usage:
  • The curve, surface or object whose normal surface vectors are to be inverted.

Figure 1. Visualizing normals

We’re going to invert the normal vectors of an existing surface. To help us visualize this, select the surface and select the View Normals option by clicking the button. The normal vectors are now visible on the geometry view:

Now we want to invert the normals, so they point downwards. To do this, use the invertNormals command:
Select objects on screen (Press enter when done): // Select the surface and press Enter

Figure 2. Result of inverting the normals