feat: added shadows

sdf.fs

@@ -44,7 +44,7 @@ Ray minFn(Ray ray){
         ray.color = vec3(1.0, 0.5, 0.2);
         ray.min = sp;
     } else {
-        ray.color = vec3(1.,1.,1.);
+        ray.color = vec3(0.2, 0.3, 0.3);
         ray.min = pl;
     }
     return applyMin(ray);
@@ -90,12 +90,21 @@ void main()
 {
     vec3 dir = vec3((texCoords - 0.5)*2,1.0);
     vec3 pos = dir;
-    Ray ray = Ray(pos,normalize(dir),.0,.0,vec3(.0));
+    Ray ray = Ray(normalize(dir),pos,.0,.0,vec3(.0));
+
+    ray = march(ray);
 
-    ray = march(ray);        
     vec3 normal = calcNormal(ray);
+
     vec3 lighDir = normalize(vec3(.5,-1.0,0.5));
-    float light = (.5 - min(dot(normal,lighDir),0.0))*2.;
+    float light = (- min(dot(normal,lighDir),0.0))*0.7+0.3;
+
+    Ray shRay = Ray(lighDir * (-1.0), ray.pos + 0.5*normal , .0,.0, vec3(.0));
+    shRay = march(shRay);
+
+    if( (dot(lighDir,normal) < 0.0) && (shRay.len <20)){
+        light *= min(shRay.len*0.1,1.0);
+    }
 
     if(ray.min <= 0.2){
         FragColor = vec4(ray.color * light, 1.0);