Spread Source
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Spread Source
Houdini 18.5
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Geometry nodes
Pyro Source Spread solves for the spreading of flame across a point cloud.
The Pyro Source Spread operation applies a diffusion and combustion solver on a point cloud. This can simulate the spread of flames and provide dynamic inputs for a pyro solver.
Clears the entire simulation cache.
What frame on the Houdini playbar that the simulation should begin at.
The visualize controls provide a quick way to visualize the common
attributes used for the spreading of fire.
Visualizes the diffrate attribute. This is a static attribute
that controls how fast temperature will diffuse into points.
Lower values will heat slower, so impede the spread of auto-ignition
due to temperature.
Visualizes the fuel attribute. This is any fuel left after burning
that will be carried to the next frame.
Visualizes the burn attribute. This measures how much fuel burned
on that point in this frame. It is commonly what will be used
as a source into a pyro solve.
Visualizes the temperature attribute. This is how hot the
point has become, either from incoming initial conditions,
combustion, or the diffusion of temperature.
Visualizes the totalburn attribute. This measures the total
amount of fuel ever burned on that point. This is useful to control
shading effect such as the charring of a surface over time.
Disables the visualization of attributes.
By what ratio the temperature cools in a twenty-fourth of a second.
0 will not cool the temperature at all. 1 will immediately cool
to zero (ambient) temperature. 0.5 will cool to 50% of the temperature
in a standard frame.
How quickly to diffuse temperature across the point cloud. A value of
1 will approximately diffuse to the first ring of neighbors, and
2 to the second ring of neighbors. This will be done within
a single frame. Note that larger numbers will trigger more iterations
so become slower.
The diffusion uses this radius to connect nearby points. The radius
must be large enough to connect close points.
No more than this number of points will be connected for diffusion.
If no incoming diffrate exists, it is assumed to be 1 and
scaled by this noise. If any incoming diffrate exists, it will
be multiplied by this noise to get the diffusion rate.
Help for the individual noise parameters can be found in
the Attribute Noise SOP.
The incoming fuel attribute will have this amount added to it.
The amount will also be scaled by the injection noise.
This amount of fuel, scaled by the injection noise, will be added
to each point in one twenty-fourth of a second.
After a point has burned, it will then inject fuel at this rate,
scaled by the injection noise, in one twenty-fourth of a second.
This is useful for simulating the emission of fuel after an object
has caught on fire without saturating the fuel field before the
fire reaches it.
The fuel attribute will not be allowed to exceed this amount. This
avoids run-away injection in places that are not burning.
The various injection parameters are all scaled by this noise.
More help on the noise parameters can be found on the Attribute
Noise SOP.
Any point whose temperature exceeds this value will burn its fuel.
If a point has this attribute, and its value for this attribute
is less than the current frame, then it will burn. This is useful
for statically keyframing when points will ignite.
If a point has this attribute, and it is non-zero, the point will
burn. This is useful for dynamically igniting points through custom
rules. This can be done in the embedded SOP network or by animating
this attribute in the input and adding it to the animated attribute
list.
Points that are burning will consume this much fuel in one twenty-fourth
of a second. If there is not enough fuel, they will generate a
proportionally smaller amount of burn. If there is too much, fuel
will be left behind for the next frame.
For every unit of fuel burned, the temperature of this point
will be increased by this amount.
The burn attribute is the ratio of the burned fuel to how much
fuel could have burned if there was infinite fuel at this point.
The burn attribute is additionally scaled by this parameter.
The set of point attributes to copy every frame from the input
onto the solved points.
How to correspond the animated input points to the current solved
points.
The rest attribute to use for noise computations. Using this avoids
having the injected fuel noise swim as an object moves through space.
How many substeps to perform for each Houdini frame. Matching this
to the substep rate of the Pyro Solver allows both to operate in
sync.
Controls if the simulation is cached to memory.
Whether to save simulation data to temporary disk files when
the memory cache is filled. This is often slower than recomputing
the data.
Pyro Solver
Pyro Source
Pyro Post-Process
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Pyro Source Spread
Unity - Scripting API: AudioSource. spread
Spread syntax (...) - JavaScript | MDN
Point spread function - Wikipedia
using UnityEngine; public class Example : MonoBehaviour
{
// when any AudioSource goes trough this transform, it will set it as 'mono'
// and will restore the value to 3D effect after exiting
// Make sure the audio source has a collider.
void OnTriggerEnter( Collider other)
{
AudioSource audio = other.GetComponent< AudioSource >(); if (audio)
{
audio.spread = 0;
}
} void OnTriggerExit( Collider other)
{
AudioSource audio = other.GetComponent< AudioSource >(); if (audio)
{
audio.spread = 360;
}
}
}
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Sets the spread angle (in degrees) of a 3d stereo or multichannel sound in speaker space.
0 = all sound channels are located at the same speaker location and is 'mono'. 360 = all subchannels are located at the opposite speaker location to the speaker location that it should be according to 3D position. Default = 0.
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