fresnel

shader.glsl

@@ -200,6 +200,9 @@ vec2 map(vec3 p, int displace)
             if( d == prismTop && u_time > rotateDelay + .2) mat = 5.;
         }
     }
+    d2 =sdSphere(p-vec3(0.,0.,0.), 1.0);
+    d=min(d, d2);
+    if (d == d2) mat = 5.;
 
     //Rotating glyphs
     vec3 p2 = ringAnim(p), q2=p2;
@@ -424,7 +427,16 @@ vec3 sceneGate(vec2 uv)
         if(mat==4.)
             col *= vec3(0.0, 0.08, 0.11) + addSpecular(n,rd,0.3,0.7);
         if(mat ==5.)
-            col *= chevronColor;  // activated glyph color
+        {
+            float exponent = 2.; // lower number makes lighting go deeper into sphere
+            float fresnel = pow(clamp(1.-dot(n, -rd), 0., 1.), exponent)*0.8;
+            vec3 rimColor = chevronColor;
+            
+            vec3 sphereColor = chevronColor + fresnel * rimColor;
+            col = sphereColor;  // activated glyph color
+
+        }
+
         if(mat == 6.) {
             col *= vec3(0.01, 0.04, 0.06) + addSpecular(n,rd,.1, 2.5);
         }