[WIP] stripe-pattern is now ok.

apps/chapter_06.cpp

@@ -77,10 +77,10 @@ int shadow_sphere(uint8_t a_canvas_pixels, double a_wall_size, uint8_t a_wall_z)
             if (the_intersec.is_defined())
             {
                 Tuple the_point  = the_ray.position(the_intersec.distance_t());
-                Tuple the_normal = the_intersec.object().normal_at(the_point);
+                Tuple the_normal = the_intersec.object()->normal_at(the_point);
                 Tuple the_eye    = -the_ray.direction();
-                Color the_color =
+                Color the_color  = the_intersec.object()->material().lighting(nullptr, the_light, the_point, the_eye,
-                    the_intersec.object().material().lighting(the_light, the_point, the_eye, the_normal, false);
+                                                                              the_normal, false);
                 the_canvas.write_pixel(x, y, the_color);
             }
         }

apps/chapter_10.cpp

@@ -54,7 +54,7 @@ int main(void)
     Material &the_floor_material = the_floor->material();
     the_floor_material.set_color(Color(1, 0.9, 0.9));
     the_floor_material.set_specular(0);
-    the_floor_material.set_pattern(new StripePattern(Color(1, 1, 1), Color(0, 0, 0)));
+    the_floor_material.set_pattern(new StripePattern(Color(1, 1, 1), Color(1, 0.9, 0.9)));
     the_world.add_object(the_floor);
 
     // The large sphere in the middle is a unit sphere, translated upward slightly and colored green.
@@ -62,6 +62,7 @@ int main(void)
     the_middle->set_transform(Matrix::translation(-0.5, 1, 0.5));
     Material &the_middle_material = the_middle->material();
     the_middle_material.set_color(Color(0.1, 1, 0.5));
+    the_middle_material.set_pattern(new StripePattern(Color(1, 1, 1), Color(0.1, 1, 0.5)));
     the_middle_material.set_diffuse(0.7);
     the_middle_material.set_specular(0.3);
     the_world.add_object(the_middle);

raytracing/src/core/intersection-data.cpp

@@ -54,9 +54,9 @@ void IntersectionData::set_distance_t(double a_value)
 
 /* ------------------------------------------------------------------------- */
 
-const Shape &IntersectionData::object(void) const
+Shape *IntersectionData::object(void) const
 {
-    return *m_shape;
+    return m_shape;
 }
 
 /* ------------------------------------------------------------------------- */

raytracing/src/core/intersection-data.h

@@ -44,7 +44,7 @@ namespace Raytracer
         double distance_t(void) const;
         void set_distance_t(double a_value);
 
-        const Shape &object(void) const;
+        Shape *object(void) const;
         void set_object(Shape *a_shape);
 
         const Tuple &point(void) const;

raytracing/src/core/intersection.cpp

@@ -141,9 +141,9 @@ double Intersection::distance_t(void) const
 
 /* ------------------------------------------------------------------------- */
 
-const Shape &Intersection::object(void) const
+const Shape *Intersection::object(void) const
 {
-    return *m_shape;
+    return m_shape;
 }
 
 /* ------------------------------------------------------------------------- */

raytracing/src/core/intersection.h

@@ -56,7 +56,7 @@ namespace Raytracer
         bool operator<=(double a_distance) const;
 
         double distance_t(void) const;
-        const Shape &object(void) const;
+        const Shape *object(void) const;
         bool is_nothing(void);
         bool is_defined(void);
 

raytracing/src/renderer/material.cpp

@@ -31,6 +31,9 @@
 #include <cmath>
 
 #include "core/common.h"
+#include "shapes/shape.h"
+
+#include "renderer/stripe-pattern.h"
 
 #include "material.h"
 
@@ -144,8 +147,8 @@ void Material::set_pattern(StripePattern *a_pattern)
 
 /* ------------------------------------------------------------------------- */
 
-Color Material::lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev, const Tuple &a_normalv,
+Color Material::lighting(Shape *an_object, const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev,
-                         bool is_shadowed) const
+                         const Tuple &a_normalv, bool is_shadowed) const
 {
     Color the_effective_color;
     Tuple the_light_v, the_reflect_v;
@@ -153,7 +156,7 @@ Color Material::lighting(const PointLight &a_light, const Tuple &a_point, const
 
     if (m_pattern != nullptr)
     {
-        the_color = m_pattern->stripe_at(a_point);
+        the_color = m_pattern->stripe_at_object(an_object, a_point);
     }
     else
     {

raytracing/src/renderer/material.h

@@ -30,13 +30,16 @@
 
 #include "core/color.h"
 #include "core/tuple.h"
+
 #include "lights/point-light.h"
-#include "stripe-pattern.h"
 
 /* ------------------------------------------------------------------------- */
 
 namespace Raytracer
 {
+    class Shape;
+    class StripePattern;
+
     class Material
     {
     public:
@@ -62,8 +65,8 @@ namespace Raytracer
         const StripePattern *pattern(void) const;
         void set_pattern(StripePattern *a_pattern);
 
-        Color lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev, const Tuple &a_normalv,
+        Color lighting(Shape *an_object, const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev,
-                       bool is_shadowed) const;
+                       const Tuple &a_normalv, bool is_shadowed) const;
 
     private:
         Color m_color;

raytracing/src/renderer/stripe-pattern.cpp

@@ -40,6 +40,7 @@ using namespace Raytracer;
 
 StripePattern::StripePattern(const Color &a_color_a, const Color &a_color_b) : m_a(a_color_a), m_b(a_color_b)
 {
+    m_transform = Matrix::identity();
 }
 
 /* ------------------------------------------------------------------------- */
@@ -72,3 +73,20 @@ const Color &StripePattern::stripe_at(const Tuple &a_point) const
 
     return m_b;
 }
+
+/* ------------------------------------------------------------------------- */
+
+void StripePattern::set_pattern_transform(const Matrix &a_transform_matrix)
+{
+    m_transform = a_transform_matrix;
+}
+
+/* ------------------------------------------------------------------------- */
+
+const Color &StripePattern::stripe_at_object(Shape *an_object, const Tuple &a_world_point) const
+{
+    Tuple the_objet_point   = an_object->transform().inverse() * a_world_point;
+    Tuple the_pattern_point = m_transform.inverse() * the_objet_point;
+
+    return stripe_at(the_pattern_point);
+}

raytracing/src/renderer/stripe-pattern.h

@@ -29,8 +29,11 @@
 /* ------------------------------------------------------------------------- */
 
 #include "core/color.h"
+#include "core/matrix.h"
 #include "core/tuple.h"
 
+#include "shapes/shape.h"
+
 /* ------------------------------------------------------------------------- */
 
 namespace Raytracer
@@ -47,7 +50,12 @@ namespace Raytracer
 
         const Color &stripe_at(const Tuple &a_point) const;
 
+        void set_pattern_transform(const Matrix &a_transform_matrix);
+
+        const Color &stripe_at_object(Shape *an_object, const Tuple &a_world_point) const;
+
     private:
+        Matrix m_transform;
         Color m_a;
         Color m_b;
     };

raytracing/src/renderer/world.cpp

@@ -29,6 +29,8 @@
 /* ------------------------------------------------------------------------- */
 
 #include "core/matrix.h"
+
+#include "shapes/shape.h"
 #include "shapes/sphere.h"
 
 #include "world.h"
@@ -158,9 +160,9 @@ Intersections World::intersect_world(const Ray &a_ray) const
 Color World::shade_hit(const IntersectionData &an_intersection_data) const
 {
     bool the_shadowed = is_shadowed(an_intersection_data.over_point());
-    return an_intersection_data.object().material().lighting(m_light, an_intersection_data.over_point(),
+    Shape *the_object = an_intersection_data.object();
-                                                             an_intersection_data.eyev(),
+    return the_object->material().lighting(the_object, m_light, an_intersection_data.over_point(),
-                                                             an_intersection_data.normalv(), the_shadowed);
+                                           an_intersection_data.eyev(), an_intersection_data.normalv(), the_shadowed);
 }
 
 /* ------------------------------------------------------------------------- */

raytracing/src/renderer/world.h

@@ -41,6 +41,8 @@
 
 namespace Raytracer
 {
+    class Shape;
+
     class World
     {
     public:

raytracing/src/shapes/shape.cpp

@@ -80,6 +80,13 @@ bool Shape::operator==(const Shape &a_shape) const
 
 /* ------------------------------------------------------------------------- */
 
+bool Shape::operator==(const Shape *a_shape) const
+{
+    return (m_transform == a_shape->m_transform) && (m_material == a_shape->m_material);
+}
+
+/* ------------------------------------------------------------------------- */
+
 Matrix &Shape::transform(void)
 {
     return m_transform;

raytracing/src/shapes/shape.h

@@ -51,6 +51,7 @@ namespace Raytracer
 
         const Shape &operator=(const Shape &a_shape);
         bool operator==(const Shape &a_shape) const;
+        bool operator==(const Shape *a_shape) const;
 
         Matrix &transform(void);
         const Matrix &transform(void) const;

tests/05_rays.cpp

@@ -242,7 +242,7 @@ SCENARIO("An intersection encapsulates t and object", "[features/intersections.f
             }
             AND_THEN("i.object = s")
             {
-                REQUIRE(i.object() == s);
+                REQUIRE(*i.object() == s);
             }
         }
     }
@@ -270,7 +270,7 @@ SCENARIO("An intersection could be affected", "[features/intersections.feature]"
                 }
                 AND_THEN("i2.object = s")
                 {
-                    REQUIRE(i2.object() == s);
+                    REQUIRE(*i2.object() == s);
                 }
             }
         }
@@ -403,11 +403,11 @@ SCENARIO("Intersect sets the object on the intersection", "[features/spheres.fea
                 }
                 AND_THEN("xs[0].object = s")
                 {
-                    REQUIRE(xs[0].object() == s);
+                    REQUIRE(*xs[0].object() == s);
                 }
                 AND_THEN("xs[1].object = s")
                 {
-                    REQUIRE(xs[1].object() == s);
+                    REQUIRE(*xs[1].object() == s);
                 }
             }
         }

tests/06_light_shading.cpp

@@ -331,7 +331,7 @@ SCENARIO("Lighting with the eye between the light and the surface", "[features/m
                 PointLight light = PointLight(Tuple::Point(0, 0, -10), Color(1, 1, 1));
                 WHEN("result <- lighting(m, light, position, eyev, normalv)")
                 {
-                    Color result = m.lighting(light, position, eyev, normalv, false);
+                    Color result = m.lighting(nullptr, light, position, eyev, normalv, false);
                     THEN("result = color(1.9, 1.9, 1.9)")
                     {
                         REQUIRE(result == Color(1.9, 1.9, 1.9));
@@ -360,7 +360,7 @@ SCENARIO("Lighting with eye between the light & surface, eye offset 45°", "[fea
                 PointLight light = PointLight(Tuple::Point(0, 0, -10), Color(1, 1, 1));
                 WHEN("result <- lighting(m, light, position, eyev, normalv)")
                 {
-                    Color result = m.lighting(light, position, eyev, normalv, false);
+                    Color result = m.lighting(nullptr, light, position, eyev, normalv, false);
                     THEN("result = color(1.0, 1.0, 1.0)")
                     {
                         REQUIRE(result == Color(1.0, 1.0, 1.0));
@@ -389,7 +389,7 @@ SCENARIO("Lighting with the eye opposite surface, light offset 45°", "[features
                 PointLight light = PointLight(Tuple::Point(0, 10, -10), Color(1, 1, 1));
                 WHEN("result <- lighting(m, light, position, eyev, normalv)")
                 {
-                    Color result = m.lighting(light, position, eyev, normalv, false);
+                    Color result = m.lighting(nullptr, light, position, eyev, normalv, false);
                     THEN("result = color(0.7364, 0.7364, 0.7364)")
                     {
                         REQUIRE(result == Color(0.7364, 0.7364, 0.7364));
@@ -418,7 +418,7 @@ SCENARIO("Lighting with the eye in the path of the reflection vector", "[feature
                 PointLight light = PointLight(Tuple::Point(0, 10, -10), Color(1, 1, 1));
                 WHEN("result <- lighting(m, light, position, eyev, normalv)")
                 {
-                    Color result = m.lighting(light, position, eyev, normalv, false);
+                    Color result = m.lighting(nullptr, light, position, eyev, normalv, false);
                     THEN("result = color(1.6364, 1.6364, 1.6364)")
                     {
                         REQUIRE(result == Color(1.6364, 1.6364, 1.6364));
@@ -447,7 +447,7 @@ SCENARIO("Lighting with the light behind the surface", "[features/materials.feat
                 PointLight light = PointLight(Tuple::Point(0, 0, 10), Color(1, 1, 1));
                 WHEN("result <- lighting(m, light, position, eyev, normalv)")
                 {
-                    Color result = m.lighting(light, position, eyev, normalv, false);
+                    Color result = m.lighting(nullptr, light, position, eyev, normalv, false);
                     THEN("result = color(0.1, 0.1, 0.1)")
                     {
                         REQUIRE(result == Color(0.1, 0.1, 0.1));

tests/08_shadows.cpp

@@ -52,7 +52,7 @@ SCENARIO("Lightning with the surface in shadow", "[features/materials.feature]")
                     bool in_shadow = true;
                     WHEN("result <- lighting(m, light, position, eyev, normalv, in_shadow)")
                     {
-                        Color result = m.lighting(light, position, eyev, normalv, in_shadow);
+                        Color result = m.lighting(nullptr, light, position, eyev, normalv, in_shadow);
                         THEN("result = color(0.1, 0.1, 0.1)")
                         {
                             REQUIRE(result == Color(0.1, 0.1, 0.1));

tests/09_planes.cpp

@@ -347,7 +347,7 @@ SCENARIO("A ray Intersecting a plane from above", "[features/planes.feature]")
                 }
                 AND_THEN("xs[0].object = p")
                 {
-                    REQUIRE(xs[0].object() == p);
+                    REQUIRE(*xs[0].object() == p);
                 }
             }
         }

tests/10_patterns.cpp

@@ -58,12 +58,15 @@ SCENARIO("A stripe pattern is constant in y", "[features/patterns.feature]")
         StripePattern pattern(Color::White(), Color::Black());
         THEN("stripe_at(pattern, point(0, 0, 0) = white")
         {
+            REQUIRE(pattern.stripe_at(Tuple::Point(0, 0, 0)) == Color::White());
         }
         AND_THEN("stripe_at(pattern, point(0, 1, 0) = white")
         {
+            REQUIRE(pattern.stripe_at(Tuple::Point(0, 1, 0)) == Color::White());
         }
         AND_THEN("stripe_at(pattern, point(0, 2, 0) = white")
         {
+            REQUIRE(pattern.stripe_at(Tuple::Point(0, 2, 0)) == Color::White());
         }
     }
 }
@@ -128,6 +131,9 @@ SCENARIO("A stripe pattern alternates in x", "[features/patterns.feature]")
 
 SCENARIO("Lightning with a pattern applied", "[features/materials.feature]")
 {
+    GIVEN("object <- sphere()")
+    {
+        Sphere object;
         Material m;
         GIVEN("m.pattern <- strip_pattern(color(1, 1, 1), color(0, 0, 0))")
         {
@@ -153,10 +159,12 @@ SCENARIO("Lightning with a pattern applied", "[features/materials.feature]")
 
                                     WHEN("c1 <- lighting(m, light, point(0.9, 0, 0), eyev, normalv, false)")
                                     {
-                                    Color c1 = m.lighting(light, Tuple::Point(0.9, 0, 0), eyev, normalv, false);
+                                        Color c1 =
+                                            m.lighting(&object, light, Tuple::Point(0.9, 0, 0), eyev, normalv, false);
                                         AND_WHEN("c2 <- lighting(m, light, point(1.1, 0, 0), eyev, normalv, false)")
                                         {
-                                        Color c2 = m.lighting(light, Tuple::Point(1.1, 0, 0), eyev, normalv, false);
+                                            Color c2 = m.lighting(&object, light, Tuple::Point(1.1, 0, 0), eyev,
+                                                                  normalv, false);
                                             THEN("c1 = color(1, 1, 1)")
                                             {
                                                 REQUIRE(c1 == Color(1, 1, 1));
@@ -174,4 +182,87 @@ SCENARIO("Lightning with a pattern applied", "[features/materials.feature]")
                 }
             }
         }
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("Stripes with an object transformation", "[features/patterns.feature]")
+{
+    GIVEN("object <- sphere()")
+    {
+        Sphere object;
+        AND_GIVEN("set_transform(object, scaling(2, 2, 2))")
+        {
+            object.set_transform(Matrix::scaling(2, 2, 2));
+            AND_GIVEN("pattern <- stripe_pattern(white, black)")
+            {
+                StripePattern pattern(Color::White(), Color::Black());
+                WHEN("c <- stripe_at_object(pattern, object, point(1.5, 0, 0))")
+                {
+                    Color c = pattern.stripe_at_object(&object, Tuple::Point(1.5, 0, 0));
+                    THEN("c = white")
+                    {
+                        REQUIRE(c == Color::White());
+                    }
+                }
+            }
+        }
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("Stripes with an pattern transformation", "[features/patterns.feature]")
+{
+    GIVEN("object <- sphere()")
+    {
+        Sphere object;
+        AND_GIVEN("pattern <- stripe_pattern(white, black)")
+        {
+            StripePattern pattern(Color::White(), Color::Black());
+            AND_GIVEN("set_transform(pattern, scaling(2, 2, 2))")
+            {
+                pattern.set_pattern_transform(Matrix::scaling(2, 2, 2));
+                WHEN("c <- stripe_at_object(pattern, object, point(1.5, 0, 0))")
+                {
+                    Color c = pattern.stripe_at_object(&object, Tuple::Point(1.5, 0, 0));
+                    THEN("c = white")
+                    {
+                        REQUIRE(c == Color::White());
+                    }
+                }
+            }
+        }
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+SCENARIO("Stripes with both an object and pattern transformation", "[features/patterns.feature]")
+{
+    GIVEN("object <- sphere()")
+    {
+        Sphere object;
+        AND_GIVEN("set_transform(object, scaling(2, 2, 2))")
+        {
+            object.set_transform(Matrix::scaling(2, 2, 2));
+            AND_GIVEN("pattern <- stripe_pattern(white, black)")
+            {
+                StripePattern pattern(Color::White(), Color::Black());
+                AND_GIVEN("set_pattern_transform(pattern, translation(0.5, 0, 0)))")
+                {
+                    pattern.set_pattern_transform(Matrix::translation(0.5, 0, 0));
+                    WHEN("c <- stripe_at_object(pattern, object, point(2.5, 0, 0))")
+                    {
+                        Color c = pattern.stripe_at_object(&object, Tuple::Point(1.5, 0, 0));
+                        THEN("c = white")
+                        {
+                            REQUIRE(c == Color::White());
+                        }
+                    }
+                }
+            }
+        }
+    }
 }