Hey! I'm trying to use Houdini's spray paint feature to place trees on a landscape. I'm attempting to follow this tutorial:


I've selected my landscape and navigated to the Spray Paint tool in the Create shelf:


Upon doing so, my landscape disappears, and instead of placing foliage, dragging the mouse on the viewport draws a red line:


My node tree looks like this.


Why can't I use the Spray Paint tool here?