Houdini offers a brush interface that lets you accomplish a number of things such as sculpting, setting capture weights or pushing around UVs. Houdini also lets you create custom attributes then paint attribute values onto geometry at the SOP level. These attributes can then be used to control all sorts of effects that take advantage of the painted values.
The next few blog entries will look at different ways of taking advantage of painted attributes. This first entry focuses on painting point probabilities to alter the distribution of points created using the Scatter SOP.
Painting point probabilities is a quick way to get points where we want them on surfaces. The basic technique can be described as scattering points in to a custom primitive attribute which the Scatter SOP supports out of the box. The weight of the attribute determines the distribution of a fixed number of points. Watch the attached video to see how this is done.
Here is the start hip file if you wish to follow along.