post process

shader.glsl

@@ -575,6 +575,11 @@ float fOpTongue(float a, float b, float ra, float rb) {
 
 //#endSection End of library
 
+// https://stackoverflow.com/questions/4200224/random-noise-functions-for-glsl
+// golden_noise
+float noise(in vec2 xy, in float seed){
+       return fract(tan(distance(xy*PHI, xy)*seed)*xy.x);
+}
 
 mat2 Rot(float a) {
     float s=sin(a), c=cos(a);
@@ -684,17 +689,17 @@ vec3 shading(vec3 v, vec3 n, vec3 dir, float material) {
 	vec3 outMaterial = vec3(0.1686, 0.1686, 0.1686);
 
     if (material == 0.) {
-        outMaterial = vec3(0.1412, 0.1412, 0.1412);
-        shininess = 11.1;
+        outMaterial = vec3(0.1608, 0.1255, 0.1255);
+        shininess = 1.;
     } else if (material == 1.) {
-        outMaterial = vec3(0.1765, 1.1961, 0.2275);
-        shininess = 31.;
+        outMaterial = vec3(0.2039, 0.2431, 0.3137);
+        shininess = 16.;
     } else if (material == 2.) {
-        outMaterial = vec3(1.1765, 0.1961, 0.2275);
-        shininess = 21.;
+        outMaterial = vec3(0.0941, 0.102, 0.1137);
+        shininess = 16.;
     } else if (material == 3.) {
-        outMaterial = vec3(0.1765, 0.1961, 1.2275);
-        shininess = 21.;
+        outMaterial = vec3(0.1569, 0.1922, 0.2549);
+        shininess = 16.;
     } 
 
 	// light 0
@@ -746,11 +751,18 @@ vec3 shading(vec3 v, vec3 n, vec3 dir, float material) {
      return final;
 }
 
+vec3 postProcess(vec3 pos, vec3 col) {             
+    float random = noise(gl_FragCoord.xy, 0.01+u_time);
+    float random2 = noise(gl_FragCoord.xy, .2+u_time);    
+    col += clamp(vec3(0.5*random, 0.5*random2, 0.*random), 0.02, 1.)*0.05; // dither / noise 
+    col = pow( col, vec3(1.0/1.3) ); // gamma
+    return col;
+}
 
 void main()
 {
     vec2 p = (2.0 * gl_FragCoord.xy - u_resolution.xy) / u_resolution.y;
-    float angle = u_time*0.4;
+    float angle = -0.4  +u_time*0.4;
     // camera
     vec3 ta = vec3(0.0, 0., 1.0);
     vec3 ro = ta + vec3(4.*sin(angle), cos(angle), 4.*cos(angle)); // *cos(angle)) 
@@ -758,19 +770,20 @@ void main()
     vec3 ww = normalize(ta-ro);             
     vec3 uu = normalize(cross(ww, vec3(0.,1.0, 0.))); // vec3 = pitch, yaw, pan
     vec3 vv = normalize(cross(uu,ww));
-    vec3 rd = normalize(p.x * uu + p.y*vv + ww * 2.0); // camera
+    vec3 rd = normalize(p.x * uu + p.y*vv + ww * 1.8); // camera
     
     // global light
     vec3 col = vec3(0.1451, 0.1098, 0.1608) - vec3(0.9725, 0.5176, 0.0) *rd.y;    
     vec2 t = castRay(ro, rd);
-
-    if (t.x > 0.) {
-        vec3 pos = ro + rd * t.x;                
+    
+    vec3 pos = ro + rd * t.x;                
+    if (t.x > 0.) {        
         vec3 nor = calcNormal(pos);
         col = shading(pos, nor, rd , t.y);
         // apply fog
-        col = applyFog(col, t.x);
-    }     
-    
-    gl_FragColor = vec4( pow( col, vec3(1.0/1.3) ), 1.0 );
+        col = applyFog(col, t.x);       
+    }
+
+    col = postProcess(pos, col);
+    gl_FragColor = vec4( col , 1.0 );
 }