Now, I add a sphere distortion and sphere distortion with movement.
This is the source code I used:
#define PI 3.1415926
void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
vec2 uv = fragCoord.xy / iResolution.xy;
// get poins
vec2 p = (2.0 * fragCoord - iResolution.xy) / iResolution.y;
// set surface formula
vec3 v = vec3(p.x, p.y, sqrt(1.0 - p.x * p.x - p.y * p.y));
// create normals
vec3 n = normalize(v);
// https://en.wikipedia.org/wiki/Distortion_(optics)
vec2 sphere_distortion = vec2(atan(n.z, n.x) / PI,0.00000001 * p.y);
vec4 color = vec4(0.0,0.0,0.0,0.0);
if (uv.x > 0.0 && uv.x < 0.5)
{
//color = texture(iChannel0, vec2(1.0 - (uv.x/0.5),uv.y/0.5)+ sphere_distortion);
// with movement iTime
color = texture(iChannel0, vec2(1.0 * iTime- (uv.x/0.5),uv.y/0.5)+ sphere_distortion);
}
else if (uv.x > 0.5 && uv.x < 1.0)
{
//color = texture(iChannel1, vec2((uv.x/0.5),uv.y)+ sphere_distortion);
// with movement iTime
color = texture(iChannel0, vec2(iTime-(uv.x/0.5),uv.y)+ sphere_distortion);
}
fragColor = color;
}
