Houdini 17 Updates


I’ll be compiling the differences between Houdini 17 here versus the lessons as they exist now until I am able to formally update them. Check it out below, and never hesitate to email me at contact@appliedhoudini.com if you have further questions!


Scope (Append) Parameters, the old window that graphed the parameters over time, is now called Isolate in Channel List instead. It is still brought up by right-clicking and holding on keyframed or expression driven parameters, and then selecting like so:


Volume lessons

Nodes used in the lesson like the Fluid Source DOP exist only as deprecated nodes (only exist for backwards compatibility with older files), and can't be made from scratch. H17 has decided to break that node (as well as the Source Volume DOP in the simulation area) into several nodes which run faster overall, but take a little more figuring out than the older all-in-one node.

Essentially it's a Pyro Source SOP (set to Source Smoke) to create points, an Attribute Noise SOP to mess up the density values a bit, and then a Volume Rasterize Attributes SOP to convert the points into a volume that can be read into the simulation with the new Volume Source DOP node, which needs only to be set to Source Smoke to work properly:

We can apply this to regular density/smoke sims as well as fuel/combustions ones. Even better, once we create this setup, we can package it up to more easily set it up again in the future:

Rigids Lessons

Voronoi Fracture SOP has been completely reorganized (and changed under the hood) but essentiall works the same - the left input takes the geometry to fracture, and the right input takes the points to base the fracture on. In order to to visualize your pieces, you can:

  • Click the little visualizer pin seen here:

  • Make a Color SOP instead, and set Class to Primitive, Color Type to Random from Attribute, and Attribute to name. This will create a color attribute. which will carry through the packing process.

The ability to easily create interior detail on the Voronoi Fracture SOP has also been removed, but we can still recreate it in the same exact way with an RBD Interior Detail SOP!

Check out both visualizing and adding interior detail here in this quick video: