Rain

The Rain node draws animated rain-drop ripples with refractive distortion. Placed above other layers, it warps what shows through — the ripples bend the image below like water on glass.

• One texture output; two optional texture inputs (the image to distort, and composite)
• Density, speed, distortion, and highlight controls
• Reads best stacked over another generator so the ripples have something to refract
• Found in nerdGRAPH under Generators as Rain

The image on the right is the example patch itself — drag and drop it onto the app (or load it with File → Load) to open the full graph.

Inputs and outputs

Parameters

Opacity, Blend Mode — the standard operator header; see Perlin Noise.

Structure

• Scale (0.1–30, default 5) — the size of the ripple field; higher values pack in more, smaller drops.
• Amplitude (0–2, default 1) — overall strength of the effect.
• Density (0–1, default 0.5) — how many drops fall at once.
• Distortion (0–1, default 0.5) — how strongly the ripples refract the input.
• Highlight (0–1, default 0.3) — brightness of the ripple rims. Raise it to make the rain read on a dark background.

Dynamics

• Speed (0–5, default 1) and Rain Speed (0–2, default 0.5) — the global rate and the drop fall rate. 0 freezes the rain.

Transform

• Seed picks the drop pattern.

Every slider has a per-parameter animation bar, so any of these can be animated, audio-driven, or MIDI-mapped — see Parameters and Controls.

Troubleshooting

Rain is barely visible — on a black background only the ripple highlights show. Wire an image into Input or stack Rain over another layer, and raise Highlight.

Rain doesn't move — Speed or Rain Speed is 0, or global animation is paused in the top bar.

Related

Rain is based on a shader by Zavie / Ctrl-Alt-Test, from the 64kB intro H — Immersion.