Merge branch 'refraction' of https://github.com/slmtnm/pyRT into refr…

…action

pyrt/renderer/simplert.py

@@ -22,9 +22,6 @@ def __init__(self, shadow=False, iterations=1):
         if self.iterations>1:
             print("# Iterations: " + str(self.iterations))
 
-        self._epsilon = 1e-4 # for float comparison
-        self._refract_offset = 1e-6 # refraction ray origin offset
-
     def _shade(self, scene: Scene, ray: Ray, hitrecord: HitRecord) -> tuple:
         r = g = b = 0  # background color
         hit = False
@@ -80,7 +77,7 @@ def _recurse_shade(self, scene: Scene, ray: Ray, iteration_num: int) -> tuple:
         if not hit or iteration_num == 0:
             return r, g, b
 
-        if hitrecord.material.reflectivity > self._epsilon:
+        if hitrecord.material.reflectivity > G_EPSILON:
             reflect_ray = Ray(hitrecord.point, reflect3(hitrecord.normal_g, ray.direction))
             new_r, new_g, new_b = self._recurse_shade(scene, reflect_ray, iteration_num - 1)
 
@@ -92,9 +89,9 @@ def _recurse_shade(self, scene: Scene, ray: Ray, iteration_num: int) -> tuple:
 
             self.num_secondary_rays += 1
 
-        if hitrecord.material.transparency > self._epsilon:
+        if hitrecord.material.transparency > G_EPSILON:
             refract_ray = Ray(
-                hitrecord.point + normalize3(ray.direction) * self._refract_offset, 
+                hitrecord.point + normalize3(ray.direction) * G_EPSILON, 
                 refract3(normalize3(hitrecord.normal_g), normalize3(ray.direction), hitrecord.material.refraction)
             )
             new_r, new_g, new_b = self._recurse_shade(scene, refract_ray, iteration_num - 1)