rgboffset.frag

vec2 offsetr = vec2(trail.r * 0.003);
vec2 offsetg = vec2(trail.r * 0.005);
vec2 offsetb = vec2(trail.r * 0.007);

float r = texture2D(uScene, uv.xy + offsetr).x;
float g = texture2D(uScene, uv.xy + offsetg).y;
float b = texture2D(uScene, uv.xy + offsetb).z;

vec3 color = vec3(r, g, b);