Archive for April, 2017

Vitality Pool – Houdini Flip Fluids Sim

I was asked to simulate a series of pools for a luxury development sales video, but I only supplied the final alembic caches for the water to be rendered in-house. So this is my render of the sim in V-Ray.

Houdini flip fluid sim, with a white water sim for the bubbles and foam. The water and the foam were exported as alembic caches into Max and rendered in V-Ray.

Vitality Pool – Houdini Flip Fluids Sim from Hugh Johnson on Vimeo.

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Houdini Differential Curve Growth

Having a play with noise based curve growth with self avoidance.
Thanks to cgwiki for the original source file:
and some great info and sample files on odforce:

I used pop streams to control the point velocity at the base of the shape otherwise it goes crazy. The mesh was exported as an alembic (7GB!) and rendered in V-Ray.

Houdini Differential Curve Growth from Hugh Johnson on Vimeo.

2nd version:

I wanted to calm the movement down compared to the previous test. So I keyed the pop drag from 1 to 10 as the shape growth progresses to slow the growth down.

I also changed the settings on the POP interact so that it wouldn’t repel the other points with as much force, The Position Force is set to 1.5 and the Velocity Force is at 1.

For this test I wanted to create a shape with a lot of intersections and came up with this.

After the curve is generated in pops, I use another resample to smooth the line again, and then use a poly wire node to generate the geometry on the curve. It’s then exported as an alembic and brought into Max to be rendered with Vray. Before rendering I subdivide the alembic again to get rid of the occasional poly spike made by the Poly Wire node.

Houdini Differential Curve Growth v02 from Hugh Johnson on Vimeo.

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Honda Robots – Made Mean

I was the senior FX TD on this project and was responsible for the flamethrower fx, robot cable sims, paint spray, logo branding and any heat haze effects.

Honda_Lighting_Master30s_v60_H264_FullRes from Hugh Johnson on Vimeo.

In addition to the main 30 second commercial, we also delivered 3 10 second commercials. I was involved in this one where I simmed all of the tyre smoke:

Honda Socials 'Nutjob' from Dave Walker on Vimeo.

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