On this tab, you can select a data source from a file. OpenVDB and AUR (PhoenixFD) formats are supported.
File name
The option allows the use of data from a file. If texture maps are defined on the Base tab, then the data from the file will be modulated (values multiplied) with the values from the texture maps.
Two file types are supported: OpenVDB and AUR (PhoenixFD).
Animated
This option allows you to use a pre-prepared series of VDB files to animate 3D effects. In this case, the specified file is taken as a base: the actual file for rendering will be obtained by a combination of its name without a number and a valid frame index. It is assumed that each file on disk corresponds to one frame.
Speed
Animation speed. If value N is specified in the parameter, then N files per frame will be read simultaneously and correctly interpolated between them for Motion Blur.
Offset
Offset of animation indexes. Allows you to move the animation forward or backward in time.
Gaussian interpolation
Enables the use of high-quality 3D data interpolation. This slows down rendering a little, but for low resolution files it improves the result a lot. This interpolation slightly blurs fine details and can therefore be bad for high resolution files.
Emission quality
For volumes that are optically thin (not dense) but very bright, like a candle flame, normal rendering produces a lot of noise. To eliminate it, Dali Renderer includes a special optimization. This parameter determines the strength of this optimization.
Density channel
Reads data for density. To do this, you need to know and specify the name of the density channel in the file. To correct the values, you can use the Mapping parameters.
Intensity (heat) channel
Reads data for the brightness of the radiation. To do this, you need to know and specify the name of the brightness channel in the file.
- Apply Density: additionally multiplies brightness by density. To correct the values, you can use the Mapping parameters.
Temperature (Kelvin) channel
Reads data for radiation temperature. To do this, you need to know and specify the name of the temperature channel in the file. The temperature is assumed to be in Kelvin. To correct the values, you can use the Mapping parameters.
- Physical: the parameter determines the correspondence to the physics of the dependence of the brightness of the radiation on temperature. In nature, the brightness of radiation strongly depends on the temperature of the heated body. This leads to the fact that, due to the narrow dynamic range, it is impossible to see all the colors present in the emission spectrum. With a Physical value of 0, the brightness is normalized and does not depend on temperature. In this case, the temperature specified on the Base tab is taken as the brightness standard. When the value is Physical 1, the radiation model fully corresponds to the blackbody radiation model. Intermediate values interpolate between these extremes.
Velocity channel
Reads the velocity vector data for the Motion Blur effect. To do this, you need to know and specify the name of the speed channel in the file.
- Scale: base speed, multiplier for file values.
Mapping
The option works the same for all channels. It takes values from the channel and translates them from the 'from' interval to the 'to' interval. The spline then adds a correction to the values in the interval, and the bias non-linearly shifts the values in the interval to the upper or lower bound.
Update models
Allows you to specify a list of 3ds Max nodes that must be updated before this material is sent for rendering. For example, tyFlow can write OpenVDB files to be used on the same frame. This list allows you to prepare such files in the desired order.
Information
Displays information about a file. In the case of an animated series of files, displays aggregated information.
