Houdini 20.5 Nodes Geometry nodes

Sky Field geometry node

Generates an initial Sky Field volume to use with sky tools.

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Since 20.0

Overview

This node generates the sky and skymask 2D volume primitives with a given resolution. You can then use one of the following to create sky cloud patterns in the volume:

You can render the sky volume directly. This can be useful to create distant 2D clouds. Alternatively, you can use the Sky Field as an input to the Sky Box node to create 3D clouds.

See How to create a sky for how to use the Sky Field node to create sky cloud patterns.

If you wire a volume into this node, the Sky Field node populates the Voxel Size, Size, and Center parameters with the volume’s information. If you don’t wire a volume into this node, you can configure the Voxel Size, Size, and Center parameters.

Parameters

General

Source Layer

The name of the layer to copy to generate the sky layers when you connect a sky or terrain field. When a volume is connected to this node’s input, enter the name of the connected volume to populate the Voxel Size, Size, and Center parameters with that volume’s information.

The default value is height.

Voxel Size

The size of voxels in the Sky Field, which determines how dense the sky is at that point. Lower values enhance the sky’s resolution with more details. When turned off, this value is based on the connected volume set in the Source Layer.

The default value is 2.

Size

The width of the 2D volume in meters. When turned off, this value is based on the connected volume set in the Source Layer.

The default value is 1000, 1000. This default is the same dimension as the HeightField node’s default size.

Center

The position of the volume’s center in the world space. When turned off, this value is based on the connected volume set in the Source Layer.

The default value is 0, 0, 0.

Vertical Offset

Raises the Sky Field’s height in meters. Adjust the value to control how many meters to raise the Sky Field from the Source Layer parameter’s value.

The default value is 200.

Layers

Sky

Controls the cloud coverage (density) of the sky.

The default value is 1.

Mask

Provides an additional mask layer to control cloud coverage details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 1.

Precipitation

Controls precipitation details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 0.25.

Anvil

Controls anvil development details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 0.25.

Altitude

Controls bottom position details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 200.

Thickness

Controls vertical thickness details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 100.

Vertical Extrusion

Controls vertical thickness extension details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 1.

Worley Scale

Controls worley details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 1.

Wispy Scale

Controls wispy details that influence how the Sky Box generates 3D clouds from the 2D volume.

The default value is 1.

See also

Geometry nodes