reproject

This is a simple command line program that changes the projection of textures.

You can transform from cubemap to latlong (also know as equirectangular), and viceversa.

Usage

There are 2 kinds of command:

reproject latlongToCubemap <inputFile> <outputFile> <outputFaceResolution> [numSamples] 

reproject cubemapToLatlong <inputFile> <outputFile> <outputWidth>x<outputHeight> [numSamples] 

The number of samples is optional. The more, the better quality (at the expense of more computation cost). The default value is 128, which is usually more than enough.

Examples:

$ ./reproject latlongToCubemap myLatlong.hdr newCubemap.hdr 512

$ ./reproject cubemapToLatlong myCubemap.png newLatlong.png 2048x1024 1000 

More info in github.

Image source: https://hdrihaven.com/hdri/?c=nature&h=sunny_vondelpark