Whether you're a real estate agent auditing virtual property layout panoramas, a game developer inspecting equirectangular environment skybox files, or simply a photography enthusiast looking at panoramic landscapes, opening 360° images locally has historically been a friction-heavy workflow.
Typically, this requires launching massive 3D environment editors or uploading files to third-party public web portals, which poses significant privacy concerns and wastes time. The 360° Panorama Image Viewer Chrome extension resolves this by executing a WebGL virtual canvas natively inside the user's browser, 100% offline.
Technical Pipeline: Sphere Projection
At the center of the extension is a WebGL projection canvas. Flat panoramic images are actually equirectangular projections (mapping a 360-degree horizontal field and a 180-degree vertical field onto a flat rectangular grid).
When you drop a JPG, PNG, or WebP file into the extension, the WebGL pipeline:
- Creates a 3D sphere geometry consisting of custom triangular vertices.
- Translates the uploaded image into an internal WebGL texture map.
- Maps this texture to the inside faces of the sphere geometry, reversing normals.
- Positions a virtual camera at coordinates
(0, 0, 0)— the absolute center of the sphere.
As the user drags, the camera coordinates update, generating perspective-correct viewport transformations dynamically.
Warping Coordinates: Little Planet Mode
One of the most notable features of the extension is the **Little Planet (stereographic)** projection mode. Stereographic projection maps points on a sphere onto a flat plane.
By transitioning the WebGL shader coordinates, the extension changes the projection mapping from regular perspective matrix multiplication to stereographic calculations, warping the edges of the panorama to wrap around a focal bottom point. This transforms standard horizons into tiny globes, allowing users to create creative views.
Feature Grid Breakdown
Format Versatility
Fully supports high-resolution equirectangular files in standard formats: JPG, PNG, and WebP.
Fluid 60 FPS Panning
Hardware-accelerated WebGL rendering maps inputs to camera translations without stuttering.
Stereographic Projections
Toggle Little Planet view modes to create unique mini-globe warped views instantly.
Snapshots Extraction
Download the exact viewport angle as a standard high-quality snapshot image file with a single click.
Immersive Feature Showcase
Explore actual screenshots showing our high-fidelity WebGL shader mappings, equirectangular adjustments, and custom camera viewport projections.
WebGL Spherical Mapping
Equirectangular textures mapped onto a 3D sphere with smooth orbital controls.
Stereographic "Little Planet"
Warp space with custom stereographic math to create tiny floating globes.
Panoramic Flat Projection
Scroll-linked dynamic flat panorama viewports for wide angles.
Explore Immersive 360° Panoramic Views
Add the extension to Chrome now to preview, explore, and snapshot local panoramas with WebGL.
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