In this tutorial we will give an in-depth explanation and demonstrate how the Brush Dynamics properties work and how they affect the painting. In each demonstration, only 1 property has been changed, the others are left unchanged at 0 but you can obviously mix the changes to these properties to add more randomness to your brush strokes. 

In all the following examples we have used the red Paint Brush 06 family from the Paint brush category, and we have painted on the white canvas. In the Clone properties chose Paint and change the brush's color from black to red or to a color you prefer. The size of the brush is 109 so to better visualize the result and the Opacity is 100.

Spacing
We will first illustrate what happens when you increase the value of the Spacing property. Spacing is the property that defines how close each brush stroke will be in relation to the one(s) next to it. The more you increase this value, the further apart the brush strokes will be from one another.

Note: In the following demonstrations, the Spacing  is set to 50 so that the results are clearly perceptible. In fact, if the spacing was 1, the behavior of the brush strokes along the path would not be visible.


Size Jitter
We will now show how increasing the Size Jitter affects the behavior of the selected brush family. Size Jitter is the property that specifies the randomness of the brush's size. At 0%, a brush's size does not change over the course of a stroke; at 100%, the brush's size has the maximum amount of variation and randomness.


Angle Jitter
We will now show how increasing the Angle Jitter changes the brush’s orientation along the path. Angle Jitter defines the randomness of the brush's angle without modifying the Brush Angle properties. The higher the jitter's value, the more random the brush angle will be.

 

Scatter

We will now illustrate how modifying the Scatter properties changes the brush strokes position along the path. This property relates to distance vs  randomness. Scattering is the amount of dispersion of the same object, in this case, the brush stroke, along a path. The higher the value, the more the distance between the brush strokes will be dispersed along the path.