tweaks to sphere trace

src/trace.frag.glsl

@@ -15,21 +15,21 @@ float scene(vec4 p) {
     return length(p.xyz) - 1.0;
 }
 
-const float EPSILON = .0001;
-const uint MAX_STEPS = 50;
+const float EPSILON = .001;
+const uint MAX_STEPS = 10;
 const float NEARPLANE = 0.;
-float FARPLANE = length(object_uniforms.dimensions / 8.);
+float FARPLANE = length(object_uniforms.dimensions / 32.);
 
 vec2 spheretracing(vec3 ori, vec3 dir, out vec3 p) {
     vec2 td = vec2(NEARPLANE, 1.);
     p = ori;
-    td.y = scene(vec4(p, camera_uniforms.campos_and_time.w)) * .9;
+    td.y = scene(vec4(p, camera_uniforms.campos_and_time.w)) * .98;
     td.x += td.y;
-    p = ori + dir * td.x;
+    p = fma(dir, vec3(td.x), ori);
     for (int i = 0; i < MAX_STEPS && td.y > EPSILON && td.x < FARPLANE; i++) {
-        td.y = scene(vec4(p, camera_uniforms.campos_and_time.w)) * .9;
+        td.y = scene(vec4(p, camera_uniforms.campos_and_time.w)) * .98;
         td.x += td.y;
-        p = ori + dir * td.x;
+        p = fma(dir, vec3(td.x), ori);
     }
     return td;
 }
@@ -53,6 +53,4 @@ void main() {
     {
         discard;
     }
-
-    return;
 }