Add fuzzy reflective material.

1 files changed, 15 insertions, 1 deletions

diff --git a/material_reflective.cpp b/material_reflective.cpp
index dc38baf..aa0d361 100644
--- a/material_reflective.cpp
+++ b/material_reflective.cpp
@@ -6,7 +6,9 @@
 #include "material.h"
 #include "material_reflective.h"
 
-bool material_reflective::scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const {
+// perfectly-smooth reflective
+template<>
+bool material_reflective_<false>::scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const {
     const auto hit_point = r.at(hit_t);
     const auto nv = hit_obj.normal_vector(hit_point);
     const auto reflected = nv.reflect(r.direction());
@@ -15,3 +17,15 @@ bool material_reflective::scatter(ray3d &r, const object &hit_obj, double hit_t,
     r.decay(albedo);
     return dot(reflected, nv) > 0;
 }
+
+// fuzzy reflective
+template<>
+bool material_reflective_<true>::scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const {
+    const auto hit_point = r.at(hit_t);
+    const auto nv = hit_obj.normal_vector(hit_point);
+    const auto reflected = nv.reflect(r.direction()) + fuzzy_.f * ruvg.range01();
+    r.source(hit_point);
+    r.direction(reflected.unit_vec());
+    r.decay(albedo);
+    return dot(reflected, nv) > 0;
+}
\ No newline at end of file