Clump Noise Size

– Add a variation to the Clump parameter.
– It’s not a ‘noise’ as all children modify its shapes in the same way, it defines the size of the curvature of the clump.

– In this example you can see how the Clump Noise Size affect a simulation for two different values:

– Clump Noise Size affects all children in the same way also when you’re working on multiple parents:

Blender Hair Clump Noise Size

Use Clump Curve

– Using clump curves you can have a better control on the way the children clump.
– When you enable the clump curve a graph appears with one starting and one ending point.

– To add a point: click on the curve
– To delete a point: select it and click on the X at the top right corner (but you cannot delete the ending points)
– To move a point: drag it

– X axis: position of the twists along the parent (0: root ; 1: tip)
– Y axis: distance from the parent (1= maximum distance, 0= minimum distance)

– I always find interesting to see how a child behaves when his parent is moving. In this video you can see two animations, note how the child firmly sticks to his parent when Y=0

– Another example:

Blender Hair Children Use Twist Curve

Use Twist Curve

– Using twist curves you can have a better control on the way the children twist.
– When you enable the twist curve a graph appears with one starting and one ending point.

– To add a point: click on the curve
– To delete a point: select it and click on the X at the top right corner (but you cannot delete the ending points)
– To move a point: drag it

– After some experiments it seems to me that:

– X axis: position of the twists along the strand (0: root ; 1: tip)
– Area under the curve: multiplicative factor for the number of twists (twist parameter).
– If you find a better explanation please send me an email!

– Example on the left: all 8 twists are rendered along all the strand (area: 100%)
– Example in the middle: children twist only in the 1st quarter and in the 3rd quarter of the strand. Total of twists: 4 (area: 25%+25% = 50%).
– Example on the right: twists are rendered along all the strand but this time not all 8 twists are rendered as total area=50%, so only 4 twists are rendered.

– In this video you can see two animations, one with the twists on the tip and the other with the twists on the root:

– Another example:

Blender Hair Children Use Twist Curve

Twist

– Number of turns along the strand.

– In this example I rendered only one hair (the orange one) with 4 children.
– One of the children is darker to show better how it twists around the parent.
– As usual I use very big hairs, as you know in this animated guide I try to focus only on the meaning of each parameter.
– Twist = 0 : children does not turn around the strand
– Twist = 2: children twist around the strand two times

– Another example
– Negative value: clockwise twist
– Positive value: counterclockwise twist

Blender Hair Children Twist

Shape

– This parameter controls the way the children clump.

– In this example Clump = -1 (the children start together at the parent’s root)
– The children are green, the parent is red
– See how 8 different values of Shape affect the shape of the children

– In this example Clump = +1 (the children meet at the parent’s tip)
– See how 8 different values of Shape affect the shape of the children

Blender Hair Children Clumping Shape

Clump

– Clump = 0 : No clumping
– Clump = 1 : The children meet at the parent’s tip
– Clump = -1 : The children start together at the parent’s root

– In this example the parent is the red one, children are green

– Another example, see how the childrens start together at the parent’s root for Clump = -1

– Another example for two different values of Clump, see how the children don’t fully reach the parent’s tip or root.

Blender Hair Children Clumping Clump

Strand Shape

– This parameter controls the transition in thickness between the root and tip.

– The value of zero makes the primitive linear.
– Positive values make the primitive rounded more towards the bottom as shown in this example:
– Negative values make the primitive rounded more towards the top.

– In this example you can see how a zero value for Strand Shape makes the root conntect to the tip in a linear way (the tip is not set to zero but is closed as the Close Tip checkbox is selected).

– Another example for two different values:

Blender Hairs Shape Strand