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概要 ¶
This node reads in the density volume (given by Density Volume), which is then processed and output as scattering
and absorption
to be used with the Karma Volume node.
Creating the expected absorption
and scattering
inputs for the Karma Volume can be rather advanced. This node offers a quick and easy solution, while also providing the familiar Smoke Color, Absorption Color, and Shadow Color interface to set the look of the smoke.
パラメータ ¶
Density Scale
Controls the overall density of the smoke. Increasing this value will give the smoke a thicker appearance. Reducing it will make the smoke less opaque. To remap the thickness of the smoke, change the menu on the right side of this parameter from Constant to Use Ramp.
Density Range
Specifies the horizontal extent of the Density Ramp, which is evaluated to get the transformed smoke density.
This parameter is available when the menu next to Density Scale is set to Use Ramp.
Density Ramp
Controls how the smoke’s density values are remapped. The horizontal axis of this ramp spans Density Range.
This parameter is available when the menu next to Density Scale is set to Use Ramp.
Scale by Control Volume
When turned on, smoke densities are affected by the Density Control Volume. In particular, the control volume’s value is mapped from Control Range to Scale Scale, which is then multiplied by smoke’s density.
With the default settings, the densities are unchanged where temperature
volume is 0
. As the temperature
values rise towards 1
, the densities will increase. If the temperature
value equals or exceeds 1
, the smoke will be twice as dense. This is useful to bring out more details when using emission masking.
Control Range
The values of Density Control Volume are remapped from this range to Scale Range before the result is multiplied by density values.
Scale Range
Controls the range of multipliers that can be applied to density by the control volume. Set the menu on the right to Use Ramp if you want to control the mapping. When this menu is set to Constant, mapping is linear.
Control Ramp
Determines how the control volume values are mapped to density scales. The horizontal and vertical axes of this ramp span Control Range and Scale Range, respectively.
This parameter is available when the menu next to Scale Range is set to Use Ramp.
Smoke Brightness
煙の全体的な明るさを制御します。 この値は、煙のカラーに対する乗数として作用します。 この値を上げると、煙がもっと明るくなります。
Smoke Color
煙の全体的なカラーを制御します。 より自然に見える煙を得るには、このパラメータの右側にあるメニューで Constant から Use Ramp に変更します。 これによって、煙のカラーを密度で可変させることができます。
Source Range
The minimum and maximum values (given by Smoke Color Source Volume) to map to the left and right endpoints of the Density Color Ramp.
Shadow Color Ramp
Controls how the values (given by Smoke Color Source Volume) are mapped to its smoke color. The horizontal axis of this ramp spans the Source Range.
Absorption Color
光がボリュームを通過する時に吸収されるカラー。
Source Range
The minimum and maximum values (given by Absorption Color Source Volume) to map to the left and right endpoints of the Absorption Color Ramp.
Absorption Color Ramp
Controls how the values (given by Absorption Color Source Volume) are mapped to its absorption color. The horizontal axis of this ramp spans the Source Range.
Shadow Color
ボリュームから落とされるシャドウのカラー。 このパラメータの右側にあるメニューを Constant から Use Ramp に変更することで、煙の密度に基づいてシャドウのカラーを変更することができます。
Source Range
The minimum and maximum values (given by Shadow Color Source Volume) to map to the left and right endpoints of the Shadow Color Ramp.
Shadow Color Ramp
Controls how the values (given by Shadow Color Source Volume) are mapped to its shadow color. The horizontal axis of this ramp spans the Source Range.
Shadow Density
この乗数は、ボリュームをライティングした時に Density Scale に適用されます。 この値を上げると、ビューアに煙の不透明度の影響を与えることなく、ボリュームを貫通する光を減らします。 この値を下げると、煙の不透明度の見え方を変えることなく光の吸収を減らします。
Tint Smoke Color with Cd
When turned on, the smoke color set by the Smoke Color parameter is multiplied by Cd
color volume (given by Cd Volume) if it exists to obtain the final smoke color.
Mix Smoke Color with Cd using Alpha
When turned on, the Alpha
volume is used to blend between the Smoke Color and the Cd
volume (given by Cd Volume) instead. Where alpha has a value of 1
, it will use the color from the Cd
volume and where Alpha is 0
, it will use the color set by Smoke Color. When this checkbox is turned off, the smoke color is the product of these two values instead.
Density Volume
The name of the volume to be used as smoke. Usually you should leave this as density
.
Density Control Volume
The control volume used to modify smoke density values. This volume is used if Scale by Control Volume is turned on. Use tempearture
or flame
for fire effects, where you want the density scaled according to your emissive volume.
Smoke Color Source Volume
Selects the volume that is used for mapping the smoke color. Setting this to Smoke Density will use the modified smoke density by the shader. Otherwise, Geometry Volume will use the specified incoming volume from the geometry.
Custom Volume
The volume that is used for mapping the smoke color.
Absorption Color Source Volume
Selects the volume that is used for mapping the absorption color. Setting this to Smoke Density will use the modified smoke density by the shader. Otherwise, Geometry Volume will use the specified incoming volume from the geometry.
Custom Volume
The volume that is used for mapping the absorption color.
Shadow Color Source Volume
Selects the volume that is used for mapping the shadow color. Setting this to Smoke Density will use the modified smoke density by the shader. Otherwise, Geometry Volume will use the specified incoming volume from the geometry.
Custom Volume
The volume that is used for mapping the shadow color.
Cd Volume
The name of the volume to be used as the color volume. Usually you should leave this as Cd
.
Alpha Volume
The name of the volume to be used as the alpha volume. Usually you should leave this as Alpha
.
See also |