Normal Edit Modifier

The Normal Edit Modifier affects (or generates) custom normals. It uses a few simple parametric methods to compute normals (quite useful in game development and architecture areas), and mixes back those generated normals with existing ones.

Options

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Normal Edit Modifier.

Mode

The two modes currently available to generate normals.

Radial aligns normals with the (origin, vertex coordinates) vector, in other words all normals seems to radiate from the given center point, as if they were emitted from an ellipsoid surface.

Directional makes all normals point (converge) towards a given target object.

Radial/Directional

Target Object

Uses this object’s center as reference point when generating normals.

Optional in Radial mode, mandatory in Directional one.

Parallel Normals

Makes all normals parallel to the line between both objects’ centers, instead of converging towards target’s center.

Only relevant in Directional mode.

Offset

Gives modified object’s center an offset before using it to generate normals.

Only relevant in Radial mode if no Target Object is set, and in Directional mode when Parallel Normals is set.

Mix Mode

Mix Mode

How to affect existing normals with newly generated ones.

Note the Multiply option is not a cross product, but a mere component-by-component multiplication.

Mix Factor
How much of the generated normals get mixed into existing ones.
Vertex Group
Allows per-item fine control of the mix factor. Vertex group influence can be reverted using the small “arrow” button to the right.

Usage

This modifier can be used to quickly generate radial normals for low-poly tree foliage or “fix” shading of toon-like rendering by partially bending default normals…

The only mandatory prerequisite to use it is to enable Auto Smooth option in Mesh properties, Normals panel.

Tip

More complex normal manipulations can be achieved by copying normals from one mesh to another, see the Data Transfer Modifier.