# Equirectangular tiles

Reduce the initial loading time and used bandwidth by slicing big equirectangular panoramas into many small tiles.

This adapter is available in the core photo-sphere-viewer package in dist/adapters/equirectangular-tiles.js.

new PhotoSphereViewer.Viewer({
  adapter: PhotoSphereViewer.EquirectangularTilesAdapter,
  panorama: {
    width: 12000,
    cols: 16,
    rows: 8,
    baseUrl: 'panorama_low.jpg',
    tileUrl: (col, row) => {
      return `panorama_${col}_${row}.jpg`;
    },
  },
});

# Example

# Configuration

# baseBlur

  • type: boolean
  • default: true

Applies a 1px blur to the base image (option baseUrl).

# showErrorTile

  • type: boolean
  • default: true

Shows a warning sign on tiles that cannot be loaded.

# resolution

  • type: number
  • default: 64

The number of faces of the sphere geometry used to display the panorama, higher values can reduce deformations on straight lines at the cost of performances.

Note: the actual number of faces is resolution² / 2.

# Panorama options

When using this adapter the panorama option and the setPanorama() method accept an object to configure the tiles.

# width (required)

  • type: number

Total width of the panorama, the height is always width / 2.

# cols (required)

  • type: number

Number of columns, must be power of two (4, 8, 16, 32, 64) and the maximum value is 64.

# rows (required)

  • type: number

Number of rows, must be power of two (2, 4, 8, 16, 32) and the maximum value is 32.

# tileUrl (required)

  • type: function: (col, row) => string

Function used to build the URL of a tile.

  • type: string

URL of a low resolution complete panorama image to display while the tiles are loading.

# basePanoData

  • type: object | function<Image, object>

Panorama configuration associated to low resolution first image, following the same format as panoData configuration object

# Preparing the panorama

The tiles can be easily generated using ImageMagick (opens new window) tool.

Let's say you have a 12.000x6.000 pixels panorama you want to split in 16 columns and 8 rows, use the following command:

magick.exe panorama.jpg \
  -crop 750x750 \
  -set filename:tile "%[fx:page.x/750]_%[fx:page.y/750]" \
  -set filename:orig %t \
  %[filename:orig]_%[filename:tile].jpg

You can also use this online tool (opens new window).

Performances

It is recommanded to not exceed tiles with a size of 1024x1024 pixels, thus limiting the maximum panorama size to 65.536x32.768 pixels (2 Gigapixels).