Houdini 20.0 Nodes VOP nodes

Fibratus VOP node

Generates a 2D, fiber like cloud pattern.

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Since 20.0


Translated from latin, meaning fibered, the fibratus cloud species is found in only high-altitude cirrus and cirrostratus cloud types.


Use the coverage input on this vop to mask this node’s effet.


Fibratus Pattern

Element Size

Uniform scale of elements in the noise.


Offset within the evaluated noise field (added to each axis). If you have the general noise effect you want, but want to get a different set of values for a different look, try changing the offset.

You can animate the noise using an expression such as $T * 0.25 here. This is faster to compute than Animate Noise, but gives the visual effect of “panning” across the noise field, which may or may not be acceptable.

Click the Per Component button for separate additional offsets along each axis.


When you turn on the Per Component button, this lets you add the a separate offset along each axis.

Trail Length

Stretches out the fiber details. Larger values will make the pattern less noise, and more parallel aligned.

Trail Width

Controls the width and the spacing of the fiber pattern.

Density Cutoff

Controls the density of the noise pattern. Increase the value to generate smaller patterns.

Distort Trails

Distort Trails

Distorts the fiber pattern with spacial noise to create varying wave pattern features over a large landscape.


Controls the effect of the distortion. Large values will create larger twists and turns in the pattern, but might create unrealistic looking cloud patterns.

Element Size Scale

Uniform scale of elements in the distortion noise. This scale is relative to Element Size which controls the overall pattern size.


Max Octaves

The number of iterations of distortion to add to the output of the basic noise. The more iterations you add, the more “detailed” the output. Note that the output may have fewer octaves than this parameter (that is, increasing the parameter will eventually stop adding detail), because the node eventually stops when there’s no more room to add more detail in the output.


Flattens the noise to prevent extreme spikes by damping the values. Higher values create a smoother look.


The scale increment between iterations of fractal noise added to the basic output. The higher the value the larger the “jaggies” added to the output. You can use a negative value for roughness.



Rotates the pattern around the up vector (given by Up Vector). Use this to control which direction the pattern is facing.

Up Vector

The normal vector of the 2D plane used to generate the noise.

See also

VOP nodes