Merge pull request #403 from RayTracing/fix-391

InOneWeekend: repair hit tolerance from fix 391

Author: hollasch

books/RayTracingInOneWeekend.html

@@ -1086,7 +1086,7 @@
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++ highlight
     vec3 ray_color(const ray& r, const hittable& world) {
         hit_record rec;
-        if (world.hit(r, 0.001, infinity, rec)) {
+        if (world.hit(r, 0, infinity, rec)) {
             return 0.5 * (rec.normal + vec3(1,1,1));
         }
 
@@ -1409,7 +1409,7 @@
     vec3 ray_color(const ray& r, const hittable& world) {
         hit_record rec;
 
-        if (world.hit(r, 0.0, infinity, rec)) {
+        if (world.hit(r, 0, infinity, rec)) {
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++ highlight
             vec3 target = rec.p + rec.normal + random_in_unit_sphere();
             return 0.5 * ray_color(ray(rec.p, target - rec.p), world);
@@ -1438,7 +1438,7 @@
         if (depth <= 0)
             return vec3(0,0,0);
 
-        if (world.hit(r, 0.001, infinity, rec)) {
+        if (world.hit(r, 0, infinity, rec)) {
             vec3 target = rec.p + rec.normal + random_in_unit_sphere();
             return 0.5 * ray_color(ray(rec.p, target - rec.p), world, depth-1);
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++