registry MOSH

Lens Warp · 039

capabilities open MOSH

Code-native visual signature / Geometry

lensWarp

Lens Warp

Barrel/pincushion distortion.

Category: Geometry
Parameters: 2
Registry no.: 039 / 143

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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`	-1..1 (rendered to 3)	0.45
Fringe	`fringe`	0..1	0.4

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": "lensWarp", "params": { "amount": 0.45, "fringe": 0.4 } }

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 r2 = dot(p,p); // Real glass disperses as it bends; per-channel fringing is what makes this // read as a lens rather than a plain pinch. float k = 1.0 + uAmount*r2*2.0; vec3 col; col.r = texture2D(uTex, p * (k * (1.0 + uFringe*0.10)) + 0.5).r; col.g = texture2D(uTex, p * k + 0.5).g; col.b = texture2D(uTex, p * (k * (1.0 - uFringe*0.10)) + 0.5).b; // Alpha follows the un-fringed lens curve (the green channel's UV) — a // transparent source's silhouette barrels/pinches with the lens, just // without the chromatic fringe that only applies to color. gl_FragColor = vec4(col, texture2D(uTex, p * k + 0.5).a); }

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Other Geometry effects

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