Houdini 22.0 Nodes Copernicus nodes

Visualize Velocity Copernicus node

Creates an RGBA Layer visualizing a 2d velocity field.

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Since 22.0

This node visualizes a 2D velocity field provided by a UV layer. It does so by creating an RGBA layer with the visualization baked into it, allowing this to be used both for debugging, but also for output.

Parameters

Method

The high-level method to use for converting the UV 2D velocity layer into a visualization.

HSV

The length of the velocity becomes the value and the direction the hue.

Streak

Particles are streaked through the velocity providing streak lines showing the flow.

Quiver Plot

Arrows are placed on a grid and oriented to the velocity direction.

HSV

Scale

Scale for converting the velocity magnitude into the value of the colour.

Streak

Density

How dense the tracking dots should be.

Scale

The velocity is scaled by this, higher values will cause the dots to streak farther for the same velocity.

Brightness

As particles streak they become darker, this counteracts that by adding a uniform brightness.

Gamma

Provide a non-linear gamma adjustment; useful for increasing the contrast of different speed trails.

Seed

The random number seed used to create the tracking dots.

Visualize Speed

Whether to colour the streaks by the local speed.

Speed Min/Max

The range of speeds to match to the beginning and end of the visualization ramp.

Compute Range

Click to fill in the Speed Min/Max parameters with the minimum and maximum values of the input source layer’s length.

Ramp

A colour ramp of the streak colour vs the speed of the velocity at the location.

Maximum Steps

This cap prevents the streaking from taking too many steps in very fast flows.

Quiver Plot

Tile Size

The grid spacing of the arrows.

Tile Padding

The spacing between arrows.

Shaft Thickness

The thickness of the shaft of the arrows.

Head Thickness

The thickness of the head of the arrows.

Head Ratio

The ratio of the head to shaft of the arrows.

Scale Arrows with Speed

Adjust the size of the arrows by the speed.

Speed Min/Max

The range of speeds to scale the arrows for.

Compute Range

Click to fill in the Speed Min/Max parameters with the minimum and maximum values of the input source layer’s length.

Visualize Speed

Whether to colour the arrows by the speed.

Speed Min/Max

The range of speeds to map the colours to.

Compute Range

Click to fill in the Speed Min/Max parameters with the minimum and maximum values of the input source layer’s length.

Visualization Ramp

A colour ramp of the arrow colour vs the speed of the velocity at the location.

Inputs

source

A UV layer providing 2D velocity values.

Outputs

result

An RGBA layer providing a visualization of the velocities.

Copernicus nodes