Polish & Effects · Small finishing touches
Noise lens reveal圆形噪点透镜
- like a magnifier
- soft edge
- grainy
As the pointer moves across the picture, a soft-edged, grainy circle follows it. Inside the circle is a different layer; outside is the original. The whole frame carries a layer of moving film grain.
When to use it
Use it for before-and-after comparison, detail magnification, and gallery peeking. Do not put it over your main controls — whatever the circle passes keeps changing, and buttons under it become hard to hit.
Parameters
two layers composited on GPU · circular SDF smoothstep(.48, .52) · aspect-corrected · grain 0.06–0.12 · centre = pointer
Recipe
Noise lens reveal → two layers composited on GPU · circular SDF smoothstep(.48, .52) · aspect-corrected · grain 0.06–0.12 · centre = pointer
One sentence for your AI
Build a circular noise lens: render two layers into RenderTargets, then composite them in GLSL. Use a circular SDF as the mask (soften the edge with smoothstep rather than a hard cut), centre it on the pointer, and show the other layer inside. Overlay a noise texture for film grain at about 0.06–0.12 strength. Remember to correct the centre coordinates by the aspect ratio or the circle becomes an ellipse.