Houdini 22.0 Nodes Copernicus nodes

Grunge Drips Copernicus node

Generates a pattern resembling drips.

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Since 22.0

This node creates a pattern of layered noises that resemble drips. Density, Secondary Mask, and Speckle Mask add drops of various sizes, while Primary Trailing and Secondary Trailing let you smear some drops to create streaks. Use Secondary Mask and Tertiary Mask to add additional streaks and smudges in the background of your pattern. For example, configure the pattern so there are multiple curvy rivulets.

Use this node as a mask or a building block for more intricate textures. For example, use this node to create water marks on windows.

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.

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.

Drips

Density

The amount of drops in the base layer (foreground).

Distortion

The amount of distortion to apply to each drop along the Y-axis. Higher values horizontally reshape the drops to create wavy streaks.

Primary Trailing

The amount of vertical trailing to apply to each drop in the base layer. Higher values extend the trail downwards to create bright, streaky drips. Lower values shorten the trail until there’s only a drop left with no streak.

Secondary Mask

The visibility of the secondary layer (background) of drops and streaks. Higher values brighten and expand the drops and streaks to add more spatters. Lower values fade and compress the drops and streaks until they disappear.

Secondary Trailing

The amount of vertical trailing to apply to each drop in the secondary layer. Higher values extend the trail downwards to create faded, streaky drips. Lower values shorten the trail until there’s only a drop left with no streak.

Tertiary Mask

The visibility of the tertiary layer (background) of smudges. Higher values brighten and expand the smudges, while lower values fade and compress the smudges until they disappear.

Speckle Mask

The visibility of the specks layer in the foreground. Higher values brighten and expand the specks, while lower values fade and compress the specks until they disappear.

Seed

The seed value that randomizes the values used in the generator. Changing this value results in a different output, but retains the same concept and look.

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 drips pattern.

See also

Copernicus nodes