Houdini 21.0 Nodes Copernicus nodes

Grunge Rust Copernicus node

Generates a pattern resembling rust on a surface.

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Since 21.0

This node creates a pattern of layered noises that resemble rust. The Rust parameters control how much of the white and black areas make up the pattern, along with the transition to and detail of the partial rust layer underneath. For example, configure the pattern so the rust (white) covers most of layer.

Use this node as a building block for more intricate textures. For example, use this node as a mask for rust damage on an iron surface.

Parameters

Range

Amplitude

The amount by which to multiply the pixel value (originally in the 0 to 1 range). The node applies this before the Center adjustment.

Values in the generated layer cover the range from C-A to C+A, where C is Center and A is Amplitude.

Note

Layers can store negative numbers and values above 1, so this may result in out-of-bounds values. Use Post Processing options to clamp the output.

Center

The center of the output pixel values, applied as an offset.

Values in the generated layer cover the range from C-A to C+A, where C is Center and A is Amplitude.

Note

Layers can store negative numbers and values above 1, so this may result in out-of-bounds values. Use Post Processing options to clamp the output.

Mask Contrast

The amount of contrast to apply to the pixel values before the Amplitude and Center parameters. You can use this parameter to make the values more extreme without exceeding the 0 to 1 range.

Pattern

Element Size

The size (in image coordinates) of the basic element of the generated pattern. You can turn on the Per-Component Controls button to adjust this further using the Element Scale parameter.

Element Scale

When the Per-Component Controls button is on, this is the per-axis scaling of the element size.

Offset

The amount to offset the entire pattern in image coordinates.

Tile Size

The size of a single tile of the pattern. The pattern periodically repeats in this size. The size is in image coordinates, so the default is for the entire default canonical image. If you have a non-square image, this should match the aspect ratio.

Rust

Coverage

The amount of white (1) or black (0) to apply across the layer. White areas are fully rusted, black areas have no rust, and the remaining areas are partially rusted.

Softness

The visibility of the partial rust layer under the white (rusted) areas. Higher values erode more partial rust into the white areas to create a soft transition between the full and partial rust. Lower values apply less partial rust in the white areas to create harsh edges around the fully rusted areas.

Rust

The visibility of the partial rust layer under the black (non-rusted) areas. Higher values erode more partial rust into the black areas to create a soft transition between no and partial rust. Lower values apply less partial rust in the black areas to create harsh edges around the non-rusted areas.

Rust Size

The size of the flakes in the partial rust. Higher values expand the size of the flakes, while lower values shrink the size of the flakes to add fine detail.

Post Processing

Note

The node applies the post-processing operations in the order they're listed.

Fold

Sets the noise values to the absolute value. For example, a pixel value of -2 becomes 2.

Note

This parameter doesn’t impact the output when there’s only positive values.

Complement

Sets the pixel value x to 1 - x.

Note

This method works for values in the 0 to 1 range. For images outside of this range, using Complement results in negative or out of range values.

Bias

The amount to pull the medium grey values (around 0.5) towards zero (if Bias is less than 1) or one (if Bias is greater than 1). A bias value of 0.5 doesn’t affect the values.

Gain

The amount to pull the medium grey values (around 0.5) together, while values around 0 and 1 are pulled apart. A gain value of 0.5 doesn’t affect the noise values.

Gamma

The overall gamma of the generated noise. Values greater than 1 increase the range of values in originally bright areas, which darkens the noise. Values less than 1 stretch out the range of values for originally dark areas, which increases the overall brightness of the noise.

Contrast

The amount to expand or shrink the overall range of tonal values. Each noise value is pushed towards (if Contrast is less than 1) or away from (if Contrast is greater than 1) medium grey values (around 0.5).

Note

This is not the same as Noise Contrast, which appears in some noise nodes and applies contrast during the noise function.

Clamp Minimum

Clamps values below the specified threshold.

Clamp Maximum

Clamps values exceeding the specified threshold.

Inputs

size_ref

A representative layer that determines the size of the output image and controls the metadata.

Outputs

grunge

The generated rust pattern.

See also

Copernicus nodes