Controlling Fluid Simulations with Custom Fields in Houdini Master ...

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Figure 15: Two spheres emitting density and color with a vortex force applied.5. Diuse the color eld using a Gas Diuse microsolver, the diusion rateshould match the density diusion rate. For fast mixing of the color, thisvalue can be increased.In Figure (15) two spheres can be seen emitting density and color informationinto a simulation. This simulation has the color elds dened as copies of thedensity values for either the red or the blue component of the Cd vector eldand does not actually require the transfer tool in SOPS. In Figure (16) you cansee a helix curve emitting density, colour and the temperature eld is driven bythe red values of the colour which causes the red smoke to rise quicker. The hueof the colour is mapped to the parametric u value of the curve.5.3.2 Advect by curveIn this example the tangent vectors of a curve are used as an extra force thatis continuously added to the velocity eld. A relatively large amount of force isapplied. Also the density eld is temporarely blurred, the gradient is taken fromthis blurred density, then normalized and applied as an additional force. Thecombined force points towards the density of the curve and along the tangentof the curve. A sphere is placed at the bottom of the helix and is emittingdensity into the simulation. The density and tangent velocity elds can be seenin Figure (17).The node tree can be seen in Figure (18) and consists of the main followingareas:26
Figure 16: A helix curve emitting density, colour and temperature into thesimulation. The red component of the colour is driving the temperature, thatis why the red smoke is rising quicker.Figure 17: The density eld and tangent velocity eld dened by a helix curveand used to advect smoke.27
Page 1 and 2: Controlling Fluid Simulations with
Page 3 and 4: 1 AbstractThere are various dierent
Page 5 and 6: Figure 2: High resolution 2d uid co
Page 7 and 8: Figure 5: The node based operator g
Page 9 and 10: sets, which means they are built fr
Page 11 and 12: • as an axis aligned plane that s
Page 13 and 14: Figure 7: The node tree for the upd
Page 15 and 16: Figure 8: The node tree showing the
Page 17 and 18: Figure 9: The node tree in Houdini
Page 19 and 20: 4.4 Up Res techniqueIn Houdini 10 a
Page 21 and 22: • The nal option is with a Gas Fi
Page 23 and 24: Figure 12: Premultiplication proble
Page 25: Figure 14: The preset smoke solver
Page 29 and 30: Figure 19: A few stages of the adve
Page 31 and 32: Figure 21: Top: The stages of the a
Page 33 and 34: and pyrosolver work took time. This
Page 35: [10] Christopher Horvath and Willi

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