= Shaping hairs =

NOTE:
    This tutorial is a detailed look into what goes on at the network level. An automatic way to create the same effect is to use the [Paint Frizz|/shelf/paintfrizz] tool on the shelf.

Rarely are individual strands of hair perfectly straight lines. Shaping the fur gives it a more natural, wavy look. This tutorial is a continuation of [Using guide hairs|usingguides]. 

NOTE:
    The fur in the screen captures has color that was created in [Changing the color of the fur using the color attribute|changingcolor].
    
    You can do this tutorial without completing the [Changing the color of the fur using the color attribute|changingcolor] tutorial. This example simply uses colored fur for better visualization in the viewport.
    
# Increase the __Points__ in the [parameter editor|/ref/panes/parms] of the [Icon:SOP/line][Line SOP|Node:sop/line] that you created in [Basic fur setup|basicsetup] to `5`.

# Insert a [Icon:SOP/group][Group SOP|Node:sop/group] after the [Icon:SOP/line][Line|Node:sop/line] node. 

    You can do this by selecting the output wire, pressing ((Tab)), and typing `group`.
    
    [Image:/images/fur/random_group.png]
    
# On the __Create__ tab of the [Group SOP|Node:sop/group], change the __Group Name__  to `root`, __Entity__ to __Points__, and __Pattern__ to `0`.

# On the __Combine__ tab, in the __Group__ parameter, set `tip` [Icon:BUTTONS/not_equal] `root`.

# Insert a [Icon:SOP/point][Point SOP|Node:sop/point] after the [Icon:SOP/group][Group SOP|Node:sop/group]. 
    
    [Image:/images/fur/random_point.png]
    
# On the [Point SOP|Node:sop/point], select `tip` from the dropdown menu of the __Group__ parameter.

# Alter the __Position__ parameter values to change the shape of the line.

    For example, set the following X, Y, and Z values in the __Position__ parameters to add randomness.
    
    table>>
        tr>>
            td>> X
            td>> `$TX + rand($PT)`
        tr>>
            td>> Y
            td>> `$TY + rand($PT + 51224)`
        tr>>
            td>> Z
            td>> `$TZ + rand($PT + 31245)`
            
    For more information, see the [rand|/expressions/rand] expression function.
    
When you turn on the [display flag|/nodes/sop] of the [Copy SOP|Node:sop/copy], you will see the lines are now frizzed.
    
    [Image:/images/fur/random_frizzy.png]
    
When you turn on the [display flag|/nodes/sop] of the [Fur SOP|Node:sop/fur], you will see the hairs are no longer straight lines, as the fur is interpolated between the frizzled guide hairs.

    [Image:/images/fur/random_fur.png]
    
For more information on shaping the hairs, see [Controlling the thickness, shape, and frizz|furstyle].
       
Remember, the [Fur SOP|Node:sop/fur] should only be used for visualization in the viewport. In order to render, it is highly recommended that you use a [fur procedural shader|/nodes/shop/vm_geo_fur], which will delay the generation of fur until render time. For more information on setting this up, see [Basic fur setup|basicsetup].