DOP Guide for Houdini

This section focuses on elements of the DOPNET and how to use them effectively in Houdini

As of writing, my Houdini version is 20.5.614

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[#1] Mutual affector relationship for merging RBDs

When merging RBD objects into something like a rigidbodysolver, make sure the affector relationship is "mutual" so that all RBD objects interact with each other correctly without one geometry exerting control over the other.

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[#2] Alternatives for "use deforming geometry" for static object imports Instead of activating deforming geometry, which could require more computing power. Try selecting the geometry you want using the OBJ Path and activating "Use object transform" instead to bring in the animation. This method only works if the transforms are at obj level of the geometry, not at SOP level.

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[#3] Gas values like disturb and turbulence in DOPs In the DOPNET, to add disturbance or turbulence to a smoke simulation. You need to utilise the gas disturb and gas turbulence DOPs. Similarly, there are DOPs for values like dissipation, shredding, buoyancy, wind, viscosity, etc.

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[#4] Temperature diffusion for DOPNET pyro solver

The temperature diffusion value creates a blur factor for temperature so the edges of the temperature can seem softer and more expanded. This can sometimes be beneficial to the look of a heat source, as it allows the heat to feel like it is slowly expanding.

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[#5] POP AXIS FORCE to create directional forces

The POP AXIS FORCE DOP allows us to generate a force in a certain axis direction. This is useful for when you want to add more force in a certain direction to create more dynamic movements for simulations like RBD or FLIP.

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