Lesson 4 of 10 · Domain warping
Leopard
Rosettes in gold. The third color is luxury.
Here comes the third color. Two smoothsteps at different thresholds create three zones: background, mid-ring, dark center. Subtracting two smoothsteps = the ring band.
Ink rosettes on kraft paper.
LayeringSubtracting two smoothsteps at different thresholds creates a mid-tone ring.
Change
vec3 spot (rosette center) to vec3(0.8, 0.1, 0.0) and rosettes become bloody eyes. Change vec3 gold to something cool like vec3(0.1, 0.4, 0.9) for a cobalt leopard.The code
void main(){
vec2 p = gl_FragCoord.xy / R * 3.0;
float warp = fb(p * 0.8);
float f = fb(p + warp * 1.2);
float ring = step(0.46, f) - step(0.58, f);
float core = step(0.58, f);
vec3 gold = vec3(0.9, 0.7, 0.35);
vec3 ring_col = vec3(0.2, 0.1, 0.03);
vec3 spot = vec3(0.04, 0.02, 0.01);
vec3 col = gold;
col = mix(col, ring_col, ring);
col = mix(col, spot, core);
col += vec3(.12,.08,.02) * pow(1.0-f, 3.) * 0.5;
gl_FragColor = vec4(col, 1.0);
}