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Eclipse

Vinyl Record zoomed in and slowed down

A vinyl record is an analog sound storage device. It has spiral grooves through which the needle vibrates. The variations in these grooves are the actual physical representation of sound.

On vinyl records, the needles move sideways. This movement is not visible to us unless zoomed in and viewed in a slow-motion video. But since the representation is live visualization of the sound, the needle is not needed for visualization.
The sideways movement was not sufficient for the visualization as the sound is decided by the audience and such a little movement is very small as visual feedback for them.

The spiral grooves were changed to concentric circles so that the entire composition doesn’t react to sound equally everywhere. Each circle can react separately.

Rings zoomed in

The composition is made on Rhinoceros 3D using Grasshopper.

Frequency Spectrum on Grasshopper

The frequency spectrum connects the computer’s microphone with the software. This input is directly connected to the circular grooves of the composition, which bounce up and down based on the frequency and volume of the sound.

The frequency of the sound decides which circles will bounce. Inner circles bounce at a lower frequency and outer circles bounce at a higher frequency of sound. So inner to outer circles = bass to treble notes. Higher the volume, the higher the rise of rings.

The sound sphere is formed by rotating the axis of the circle by reacting to the sound input. It is placed at the center of the circular rings. The purpose of the sound sphere is to make the composition visually more interesting.

The final composition reacting to sound
No foreground sound

Since the composition was sensitive to all sounds, it was necessary to separate foreground and background sounds. So the color was set to black for low and unclear sounds (people talking at a distance) and will only change color when it hears a strong sound (a person speaking closeby or playing a song).

It also changes color based on the volume. This effect is created by adding a six-color gradient to the material of both rings and the sphere.

Different colors showing the difference in the volume of notes

The six colors in the gradient from left to right are black, blue, green, yellow, orange and red, where black is the lowest volume and red is the highest volume. The amount of black is very little, hence not visible in the image above.

The Grasshopper code of the final composition
Final composition in different viewports

Clockwise from top left: Top view, Perspective, Perspective-Top, Right

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