When you apply a fur description to a surface,
each hair making up the fur description points in a direction normal (perpendicular)
to the surface by default. This direction is called the surface
normal. When the fur does not display consistently on
a model it may indicate that the surface normals are oriented inconsistently.
- Dolly the camera so you can view inside
The fur feedback is pointing
towards the inside of the arm.
In this model, the fur
was applied to the inside of the leg, arm, and head surfaces because
the surface normals on these surfaces are pointing in the wrong
direction. There are several reasons why this can occur, including
when a surface is duplicated with a negative scale value.
correct this, you’ll need to reverse the surface normals on the
legs, arms, and head surfaces of the model.
Reversing the surface
menu set: Normals
) is useful when you want to change the surface
direction (that is, whether the surface is oriented inwards or outwards
in relation to the model). For example, duplicating a surface across
its axis of symmetry can reverse the surface normals on the duplicated
surface. Using the Reverse Normals
When a character has
existing animation rigging or texturing and you need to assign fur,
the desired technique for reversing the orientation of the fur feedback
is by reversing the fur normals (Fur
> Reverse Fur Normals). Reversing the fur normals
leaves the surface direction unchanged.
To reverse the surface normals
- With only the legs, arms, and top head
surfaces selected, switch to the Polygons menu
set and then select Normals > Reverse > .
- Set the Reverse normals on setting
to Selected faces and then click Reverse
The normals of the selected
polygon surfaces are reversed so that the fur description points
in the correct direction.
Before proceeding to
the next section, return to the Rendering menu set.