Calculate the screen space uv to map a texture over the mesh regardless of the mesh position or orientation

fragment.glsl

/*  Fragment shader 
//
//  Screen space 
//
*/

uniform vec2 uResolution; // screen width and height

void main()
{

  vec2 uv = gl_FragCoord.xy / uResolution; // screen space uv to map textures to the full shape of the model regardless of position
  
  gl_FragColor = vec4( uv, 0.8, 1.0 ); // display uv

}