registry MOSH

Twirl · 040

capabilities open MOSH

Code-native visual signature / Geometry

twirl

Twirl

Spiral swirl from center.

Category: Geometry
Parameters: 2
Registry no.: 040 / 143

Run Twirl in the browser

What it reads

Frame-local Reads only the current frame, which makes it the cheapest kind to stack and safe to render into a Conjure window at any size.

Parameters

param	key	range	default
Amount	`amount`	-2..2 (rendered to 6)	0.9
Falloff	`falloff`	0..1	0.5

The renderer widens amount past its declared maximum by 2× before it reaches the shader, because most shader bodies were tuned against a muted top end. The rendered figure is the bound that actually arrives.

Defaults as a layer

{ "effectId": "twirl", "params": { "amount": 0.9, "falloff": 0.5 } }

GLSL fragment shader

The effect's own code. The uniforms and helpers above it — uTex, uFeedback, the depth proxy, the frame ring, depthAt(), timeAt() — are the same header every Ether-MOSH shader opens with, and are documented once on the registry rather than reprinted on all 143 pages.

void main(){ vec2 p = vUv-0.5; float r = length(p); // Falloff sets how fast the twist dies with radius: tight vortex through // to a whole-frame rotation. float a = atan(p.y,p.x) + uAmount * pow(max(0.0, 1.0 - r), mix(0.35, 3.5, uFalloff)) * 3.0; gl_FragColor = texture2D(uTex, vec2(cos(a),sin(a))*r + 0.5); }

← previous lensWarp next → filmGrain

Other Geometry effects

143 effects / 5 categories / one GPU Back to the full registry