Direct Velocity| useDirectedVelocity – Creates velocities in a certain direction or based on a Texmap.
Modifiers| dmoddirvel– Discharge Modifiers can be attached here in order to affect the Direct Velocity parameter.
Map | usedirvelmap – Allows you to vary the Direct Velocity over the surface or the volume of the emitters. If this is not used, the Source will emit equal Direct Velocity over the entire surface or volume of the emitters.
None – The Direct Velocity channel will not vary. Texmap– Allows you to specify a texture map to direct the velocity of the fluid emitted by the Source. When using Texmap, the Direct Velocity is generated from the selected texture and is not multiplied by the value added in the Directed Velocity X/Y/Z slots. Vertex Color – The Direct Velocity of the emitted fluid is determined by the emitter node's vertex colors. When using Vertex Color, the Direct Velocity is generated from the created vertex color and is not multiplied by the value added in the Directed Velocity X/Y/Z slots.
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When using a Texture map to direct the Velocity of the fluid emitted from the Source:
The Red color affects the Direct Velocity on the +/- X axis.
The Green color affects the Direct Velocity on the +/- Y axis.
The Blue color affects the Direct Velocity on the +/- Z axis.
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Motion Vel. | usevel, velmult – When enabled, moving emitters will affect the velocity of the fluid and make it follow the emitter. This effect is controlled with the specified multiplier. If the emitter is not moving, this option has no effect.
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Particles with attached geometry (such as PFlow particles using a Shape Instance operator) will act like standard geometry obstacles and will push the fluid by default, as long as their Solid Phoenix property is enabled.
Particles without geometry (even PFlow particles with a plain Shape operator) will need to be attached to a Source in order to interact with the fluid in any way.
Particles without geometry can emit fluid using their shape and size using the Source's Particle Shape and Custom Prt Size options.
Particles without geometry will not affect the fluid's motion by default, so you need to enable Motion Vel. explicitly if you need this effect.
If Motion Vel. is enabled, the fluid emitted by a particle may refuse to leave the particle shape area and continue to move together with the particle, because it will have the same velocity.
Modifiers | dmodvel – Discharge Modifiers can be attached here in order to affect the Motion Vel. parameter.
Polygon ID | poly_id – Only the polygons with the specified ID of the emitter geometry will emit the fluid.
