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

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Figure 13: Incorrectly post-multiplying of the attribute (temperature) by thedensity will cause artifacts, note the banding in the brighter areas, that becomemore apparent in an animation.24
Figure 14: The preset smoke solver with the color eld added to it, as describedin (5.3.1)5.3 Examples of custom eldsThe next sections will talk about how some setups can be created and what isrequired to implement the custom elds in dops for each example.5.3.1 Colour eld additionOnce the colour (Cd) attribute is transferred onto a volume in SOPS using thevolume attribute transfer tool, the necessary elds can be added in DOPS, thenode tree can be seen in Figure (14) :1. A Sop Vector Field, Cd, is dened to bring in the newly dened Cd eldfrom SOPS. This eld will contain the color information throughout thesimulation.2. Another Sop Vector Field, Cd_source, is dened using the Cd eld fromSOPS. This eld will be used to add color information to the Cd eld atthe beginning of every frame. If this eld is animated, it is required thatthe Time and SOP Path are always evaluated. The Time parametershould be set to $T.3. Using a Gas Calculate with a the calculation set to Maximum, the destinationeld set to Cd and the source eld set to Cd_source will copyinformation from the source into the destination eld at the start of everyframe using a maximum operation.4. Advect the color eld by the velocity, using a Gas Advect microsolvers25
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: Figure 12: Premultiplication proble
Page 27 and 28: Figure 16: A helix curve emitting d
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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