VR180: paint on a fisheye → half-equirectangular → optional foveation pre-warp → look-around preview

Left: paint on fisheye. Middle: output (Half-equirect or Foveated). Right: headset-style preview (drag to look around).

Load image (PNG/JPG) Source layout Max input size (auto downscale for speed)

Brush size

Color

Eraser (hold E)

Output resolution (per eye)

Output SBS (mono duplicates; stereo mode uses both eyes)

Output image (display + preview texture)

Foveated mode applies the same axis-wise exponential warp as your Core Image Metal kernel (k, center). Higher k compresses the periphery more.

Foveation k

Fovea center X (0..1)

Fovea center Y (0..1)

Theta max (deg) (kept for parity)

Matches your CLI option shape; the current pre-warp uses k + center only (like your Metal kernel).

Fisheye mapping model

FOV (degrees)

Circle radius (%)

Flip X Flip Y

Preview FOV (viewer)

Foveation-aware preview (mesh compensation)

When Output image is Foveated, this makes the preview apply the corresponding forward warp (equivalent to using a distortion mesh). Turn this off to preview the raw warped texture.

Preview eye

Input: fisheye (paint here)

If your file is dual-fisheye SBS, pick LEFT or RIGHT, or choose BOTH for stereo → SBS output.

Output: half-equirectangular or foveated

This canvas is the texture the preview samples.

Preview: drag to look around

Drag to pan • scroll to zoom • double-click to center. (This is a simple WebGL viewer, not full WebXR.)