3D Texture Volume Render
In: Filter/Effect
Simple
Description
The 3D Texture Volume Render node renders the volume of a shape described by a 3D texture, using its corresponding signed distance field from the 3D Signed Distance Field image input.
The volume is represented within the bounds of a unit cube. The lighting is computed using directional light and an hemispherical skylight.
| note note |
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| NOTE |
| The signed distance field is expected to be a 4096x4096 texture describing the shape with a 16x16 grid of 256 slices. You may use the 3D Texture SDF node to compute the signed distance field for a 3D texture of 256 slices. |
Parameters
Inputs
- 3D Signed Distance Field Grayscale
The 4096x4096 image representing the 256 slices of a shape’s signed distance field, arranged in a 16x16 grid.
You may use the 3D Texture SDF node to compute the signed distance field for a 3D texture of 256 slices. - Density Grayscale
The 4096x4096 image representing the 256 slices of a shape’s density, arranged in a 16x16 grid. Density is mapped using grayscale values from 0 (entirely transparent) to 1 (entirely opaque).
You may use 3D Volume Mask or 3D noise nodes (3D Perlin Noise, 3D Voronoi, 3D Ridged Noise Fractal, etc.), combined with a 3D Texture Position node as position input, to generate a volume mask as a 3D texture of 256 slices.
Parameters
-
Output Resolution Integer2
The resolution of the output image in X and Y, expressed as a power of two. -
Camera Position Float2
The position of the camera around the shape.
When the node is selected, you may use the position gizmo in the 2D View to orbit the camera. -
Light Position Float2
The position of the directional light around the shape.
When the node is selected, you may use the position gizmo in the 2D View to orbit the light source. -
Camera Distance Float
The distance from the camera to the shape. -
Camera FOV Float
The field of view of the camera in degrees. -
Absorption Float
Adjusts how much light is absorbed as it passes through the volume. -
Feather Float
Multiplies the value supplied by the Density input with the inner distance field value.
This effectively adjusts the width of the fading gradient from the volume’s outer limit inwards. -
Light Color Mode Integer
Sets the method of acquiring the color of the directional light:- Temperature (Kelvin): The color results from the light temperature, where a lower value results in a warmer color
- RGB Color: Define the color using RGB values
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Light Temperature (Kelvin) Float
The temperature of the directional light, which impacts its color. A lower value results in a warmer color.
Useful values:
1800 K - Candle light
2800 K - Incandescent bulb
5500 K - Daylight
6200 K - Natural white
7000 K - Overcast sky
Note: This parameter is only available when the Light Color Mode parameter is set to Temperature (Kelvin). -
Light Color Float3
The color of the directional light.
Note: This parameter is only available when the Light Color Mode parameter is set to RGB Color. -
Light Intensity Float
The intensity of the directional light. -
Ambient Color Float3
The color of the ambient skylight. -
Ambient Intensity Float
The intensity of the ambient skylight. -
Albedo Float3
The albedo color of the volume. -
Background Mode Integer
The method of shading the background of the rendered scene, based on the Background Color:- Shaded: The color is impacted by the directional light’s color and intensity- Constant Color: The color is applied uniformly regardless of the directional light
-
Background Color Float4
The color used to fill the background of the rendered scene. -
Dithering Float
Adjusts the intensity of the blue noise dithering used to smooth out the shading. -
Enable Ground Plane Boolean
When True, renders an infinite ground plane. The unit cube enclosing the shape rests on this plane. -
Infinite Plane Boolean
Sets the ground plane to extend infinitely to the horizon.
Note: This parameter is only available when the Enable Ground Plane parameter is set to True. -
Ground Plane Size Float2Adjusts the size of the ground plane.
Note: This parameter is only available when the Enable Ground Plane parameter is set to True and the Infinite Plane parameter is set to False.
Example Images
