glsl-earth

(glslbin demo)

Quickly get a spinning Earth-like planet on a black background in GLSL. This is not distance field rendering, just a 2D effect.

precision mediump float;
 
uniform float iGlobalTime;
uniform vec3  iResolution;
 
#pragma glslify: planet = require('glsl-earth') 
 
void main() {
  vec2 uv = gl_FragCoord.xy / iResolution.xy;
 
  //the rotation 
  vec2 rot = vec2(iGlobalTime*0.03, iGlobalTime*0.01);
  
  //% of screen 
  float size = 0.75;
 
  //create our planet 
  vec3 color = planet(uv, iResolution.xy, size, rot);
  
  gl_FragColor.rgb = color;
  gl_FragColor.a = 1.0;
}

PRs welcome for improvements/optimizations.

Usage

vec3 color = planet(vec2 uv, vec2 resolution, float size, vec2 rotation)

Gets a planet based on the screen uv and resolution. The size is how big the planet shoul be, where 1.0 fits the screen. rotation is how much to rotate the planet.

vec3 color = planet(vec2 uv, vec2 resolution, float size)

The same as above but with no rotation.

vec3 color = planet(vec2 uv, vec2 resolution)

The same as above but with no rotation and a default size of 1.0

License

MIT, see LICENSE.md for details.