DOP Network

Most of the building of the Carbon Simulation happens within the Houdini DOP Network graph.

The DOP nodes allow a logical interpretation of the elements required to represent a simulation with concepts such as Object, Relationship, and Solver clearly separated.

Because of its focus on simulation, the DOP Network implementation of Carbon is slightly faster than the simpler SOP Network implementation. It is also more comprehensive.


A simple Carbon Simulation setup in a DOP Network graph.

The creation of the graph is made directly in the graph window using the TAB menu to lay down the Carbon nodes, that you will find under the Numerion Carbon submenu.

Connections are usually established between object nodes placed at the top of the graph and one or several Houdini Merge nodes, and then down to the relationships before ending up with the solver node.

The solver node requires the blue Display flag for the simulation to be activated.

A few other standard Houdini nodes such as Switch can also be useful in the creation of more complex graphs.


Since the simulation is cached by default from the dopnet object node, it is sometimes useful to dirty the cache. Any modification to the graph will usually dirty the cache, but if no modification is required then the yellow Bypass flag can be used for this purpose. Simply click twice to alternately enable and then disable the Bypass flag on any node, and when the playback restarts it won’t be from the cache.