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Houdini

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Modelling. Pyro. Houdini-infos. Nate Usiak - Tools. Nate Usiak - Tools. Tools - Noise Box - Vel From Curve This tool is designed to take an input curve and basically add a cylindrical area of velocities around it to be used in many types of simulations to allow for more brute force control.

Nate Usiak - Tools

The tool has many controls on it to allow the artist a range of manipulation. It has a ramp that controls the thickness of the tube of velocities around the curve. Also a ramp to control the scale of the velocities from the start to the end of the curve. A parameter to scale the overall velocity and also controls to add noise. Elastic effect on flip fluids on H12. That setup looks good for strain.

Elastic effect on flip fluids on H12

The only big thing missing is the strain isn't being rotated by the velocity field. So if you have a blob that is stretched in X, then rotated 90 degrees, it will still try to restore along the X axis. Gas Velocity Stretch is supposed to fix this, but it is a pretty subtle thing. It's also a bit not-FLIP like because you are keeping a field from frame to frame.

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