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Tunnels effect

Vortex Tunnel

Vortex Tunnel is a tunnel and feedback effect in FRCTL, the browser VJ studio. A spinning spiral pull with rainbow tunnel bands.

Runs live on video, images, a camera or generated art. Stack it with any other effect, and route LFOs, envelopes or any of ten audio bands to its controls so it moves with the music.

The untouched demo art: an eye inside a triangle over wavy teal, blue and peach lines
Source
The eye-in-triangle twisted into a whirlpool, its wavy lines streaked with rainbow green, pink and blue bands
Vortex Tunnel, default settings

What Vortex Tunnel does

Wrings the picture around the centre, hardest in the middle and easing off toward the corners, while the whole frame keeps turning. Rainbow rings multiply over the colours and travel outward. Twist sets how tight the middle winds, Spokes bends the rings into spiral arms (hard left leaves plain circles), Density only tightens the rings from centre up, and Wind flips the turn.

Using Vortex Tunnel

Where it works
A spinning intro loop, or a drop where the art should dissolve into colour. The corners barely twist, so a logo placed off-centre turns with the frame but keeps its shape.
With the music
The spin runs off the clock and ignores the audio. Send B1 (kick) to Twist so each kick winds the centre tighter, and put a slow LFO on Tint to walk the rings round the colour wheel over a phrase.
Starting point
Twist centre, Bands a quarter, Density centre, Spokes hard left for clean rings, then push Twist toward three-quarters until the eye starts to wring.

Controls

Twist
Spiral rotation strength.
Bands
Rainbow band overlay amount.
Density
Angular/radial band frequency.
Tint
Rotates the tunnel bands around the wheel.
Wind
Which way the vortex turns.
Spokes
How many band arms run out from the centre. Hard left is pure rings with no arms.
Speed
Rate of the effect motion. Centre is the authored speed, hard left a tenth of it.

Pairs well with Vortex Tunnel