Now for a practical example of our past few lessons. In this video lesson we will paint points on a bleeding heart.
To take things further, you can combine techniques together. First paint a probability weight to scatter the points. These are the areas of interest. Then paint into those areas with the point cull weight attribute. The advantage to this is you are no longer flooding the entire surface with particles which can slow down the Delete SOP.
Working with Hundreds of Thousands of Points...
What if you are working with hundreds of thousands of points? That's a lot of points to be painting in general. At that point you want to be using texture maps to control the scatter areas, as well as the culling maps. Paint an area in the texture map then refresh the image reference in Houdini and preview the result.
Below is the final hip file if you wish to follow along: