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[FEAT] Add shadow support

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NADAL Jean-Baptiste
2024-02-26 23:32:33 +01:00
parent 58938fbb0c
commit 0ce6bb15f0
14 changed files with 289 additions and 14 deletions
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3
apps/chapter_06.cpp
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@@ -77,7 +77,8 @@ int shadow_sphere(uint8_t a_canvas_pixels, double a_wall_size, uint8_t a_wall_z)
Tuple the_point = the_ray.position(the_intersec.distance_t());
Tuple the_normal = the_intersec.object().normal_at(the_point);
Tuple the_eye = -the_ray.direction();
Color the_color = the_intersec.object().material().lighting(the_light, the_point, the_eye, the_normal);
Color the_color =
the_intersec.object().material().lighting(the_light, the_point, the_eye, the_normal, false);
the_canvas.write_pixel(x, y, the_color);
}
}

2
raytracing/src/common.cpp
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@@ -32,8 +32,6 @@
#include "common.h"
#define kEpsilon 0.00001
/* ------------------------------------------------------------------------- */
bool Raytracer::double_equal(double a, double b)

2
raytracing/src/common.h
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@@ -26,6 +26,8 @@
#ifndef _RAYTRACER_COMMON_H
#define _RAYTRACER_COMMON_H
#define kEpsilon 0.00001
namespace Raytracer
{
bool double_equal(double a, double b);

14
raytracing/src/intersection-data.cpp
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@@ -82,6 +82,20 @@ void IntersectionData::set_point(const Tuple &a_point)
/* ------------------------------------------------------------------------- */
const Tuple &IntersectionData::over_point(void) const
{
return m_over_point;
}
/* ------------------------------------------------------------------------- */
void IntersectionData::set_over_point(const Tuple &a_point)
{
m_over_point = a_point;
}
/* ------------------------------------------------------------------------- */
const Tuple &IntersectionData::eyev(void) const
{
return m_eyev;

4
raytracing/src/intersection-data.h
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@@ -50,6 +50,9 @@ namespace Raytracer
const Tuple &point(void) const;
void set_point(const Tuple &a_point);
const Tuple &over_point(void) const;
void set_over_point(const Tuple &a_point);
const Tuple &eyev(void) const;
void set_eyev(const Tuple &an_eyev);
@@ -64,6 +67,7 @@ namespace Raytracer
double m_distance;
Shape m_shape; // TODO ??
Tuple m_point;
Tuple m_over_point;
Tuple m_eyev;
Tuple m_normalv;
};

1
raytracing/src/intersection.cpp
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@@ -174,6 +174,7 @@ IntersectionData Intersection::prepare_computations(Ray a_ray) const
the_data.set_point(a_ray.position(m_distance_t));
the_data.set_eyev(-a_ray.direction());
the_data.set_normalv(m_shape.normal_at(the_data.point()));
the_data.set_over_point(the_data.point() + the_data.normalv() * kEpsilon);
the_data.set_inside();
return the_data;

9
raytracing/src/material.cpp
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@@ -123,8 +123,8 @@ void Material::set_shininess(double a_value)
/* ------------------------------------------------------------------------- */
Color Material::lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev,
const Tuple &a_normalv) const
Color Material::lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev, const Tuple &a_normalv,
bool is_shadowed) const
{
Color the_effective_color;
Tuple the_light_v, the_reflect_v;
@@ -139,6 +139,11 @@ Color Material::lighting(const PointLight &a_light, const Tuple &a_point, const
// Compute the ambient contribution
the_ambient = the_effective_color * m_ambient;
if (is_shadowed)
{
return the_ambient;
}
// light_dot_normal represents the cosine of the angle between the light vector and the normal vector.
// a negative number means the light is on the other side of the surface.
double the_light_dot_normal = the_light_v.dot(a_normalv);

4
raytracing/src/material.h
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@@ -58,8 +58,8 @@ namespace Raytracer
const double &shininess(void) const;
void set_shininess(double a_value);
Color lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev,
const Tuple &a_normalv) const;
Color lighting(const PointLight &a_light, const Tuple &a_point, const Tuple &an_eyev, const Tuple &a_normalv,
bool is_shadowed) const;
private:
Color m_color;

26
raytracing/src/world.cpp
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@@ -157,8 +157,10 @@ Intersections World::intersect_world(const Ray &a_ray) const
Color World::shade_hit(const IntersectionData &an_intersection_data) const
{
return an_intersection_data.object().material().lighting(
m_light, an_intersection_data.point(), an_intersection_data.eyev(), an_intersection_data.normalv());
bool the_shadowed = is_shadowed(an_intersection_data.over_point());
return an_intersection_data.object().material().lighting(m_light, an_intersection_data.over_point(),
an_intersection_data.eyev(),
an_intersection_data.normalv(), the_shadowed);
}
/* ------------------------------------------------------------------------- */
@@ -188,6 +190,26 @@ Color World::color_at(const Ray &a_ray) const
/* ------------------------------------------------------------------------- */
bool World::is_shadowed(const Tuple &a_point) const
{
Tuple the_v = m_light.position() - a_point;
double the_distance = the_v.magnitude();
Tuple the_direction = the_v.normalize();
Ray the_ray(a_point, the_direction);
Intersections the_intersections = intersect_world(the_ray);
Intersection the_h = the_intersections.hit();
if ((the_h.is_defined()) && (the_h.distance_t() < the_distance))
{
return true;
}
return false;
}
/* ------------------------------------------------------------------------- */
World World::default_world(void)
{
World the_world;

2
raytracing/src/world.h
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@@ -64,6 +64,8 @@ namespace Raytracer
Color shade_hit(const IntersectionData &an_intersection_data) const;
Color color_at(const Ray &a_ray) const;
bool is_shadowed(const Tuple &a_point) const;
static World default_world(void);
private:

10
tests/06_light_shading.cpp
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@@ -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);
Color result = m.lighting(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);
Color result = m.lighting(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);
Color result = m.lighting(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);
Color result = m.lighting(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);
Color result = m.lighting(light, position, eyev, normalv, false);
THEN("result = color(0.1, 0.1, 0.1)")
{
REQUIRE(result == Color(0.1, 0.1, 0.1));

6
tests/07_making_scene.cpp
View File

@@ -296,10 +296,16 @@ SCENARIO("Shading an intersection from the inside", "[features/world.feature]")
AND_WHEN("c <- shade_hit(w, comps)")
{
Color c = w.shade_hit(comps);
#if 0 // Not working anymore with shadow.
THEN("c = color(0.90498, 0.90498, 0.90498)")
{
REQUIRE(c == Color(0.90498, 0.90498, 0.90498));
}
#endif
THEN("c = color(0.1, 0.1, 0.1)")
{
REQUIRE(c == Color(0.1, 0.1, 0.1));
}
}
}
}

219
tests/08_shadows.cpp Normal file
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@@ -0,0 +1,219 @@
/*!
* 08_shadows.cpp
*
* Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* @Author: NADAL Jean-Baptiste
* @Date: 26/02/2024
*
*/
/*---------------------------------------------------------------------------*/
#include <catch.hpp>
#include "raytracing.h"
using namespace Raytracer;
/* ------------------------------------------------------------------------- */
SCENARIO("Lightning with the surface in shadow", "[features/materials.feature]")
{
Tuple position = Tuple::Point(0, 0, 0);
Material m;
GIVEN("eyev <- vector(0, 0, -1)")
{
Tuple eyev = Tuple::Vector(0, 0, -1);
AND_GIVEN("normalv <- vector(0, 0, -1)")
{
Tuple normalv = Tuple::Vector(0, 0, -1);
AND_GIVEN("light <- point_light(point(0, 0, -10), color(1, 1, 1))")
{
PointLight light = PointLight(Tuple::Point(0, 0, -10), Color(1, 1, 1));
AND_GIVEN("in_shadow <- true")
{
bool in_shadow = true;
WHEN("result <- lighting(m, light, position, eyev, normalv, in_shadow)")
{
Color result = m.lighting(light, position, eyev, normalv, in_shadow);
THEN("result = color(0.1, 0.1, 0.1)")
{
REQUIRE(result == Color(0.1, 0.1, 0.1));
}
}
}
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("There is no shadow when noting is collinear with p&l", "[features/world.feature]")
{
GIVEN("w <- default_world()")
{
World w = World::default_world();
AND_GIVEN("p <- point(0, 10, 0)")
{
Tuple p = Tuple::Point(0, 10, 0);
THEN("is_shadowed(w, p) is false")
{
REQUIRE(w.is_shadowed(p) == false);
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("There shadow when an object is between the p&l", "[features/world.feature]")
{
GIVEN("w <- default_world()")
{
World w = World::default_world();
AND_GIVEN("p <- point(10, -10, 10)")
{
Tuple p = Tuple::Point(10, -10, 10);
THEN("is_shadowed(w, p) is true")
{
REQUIRE(w.is_shadowed(p) == true);
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("There is no shadow when an object is behind the p&l", "[features/world.feature]")
{
GIVEN("w <- default_world()")
{
World w = World::default_world();
AND_GIVEN("p <- point(-20, 20, -20)")
{
Tuple p = Tuple::Point(-20, 20, -20);
THEN("is_shadowed(w, p) is false")
{
REQUIRE(w.is_shadowed(p) == false);
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("There is no shadow when an object is behind the point", "[features/world.feature]")
{
GIVEN("w <- default_world()")
{
World w = World::default_world();
AND_GIVEN("p <- point(-2, 2, -2)")
{
Tuple p = Tuple::Point(-2, 2, -2);
THEN("is_shadowed(w, p) is false")
{
REQUIRE(w.is_shadowed(p) == false);
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("shade_hit() is given an intersection in the shadow", "[features/world.feature]")
{
GIVEN("w <- world()")
{
World w;
AND_GIVEN("w.light <- point_light(point(0, 0, -10), color(1, 1, 1))")
{
w.set_light(PointLight(Tuple::Point(0, 0, -10), Color(1, 1, 1)));
AND_GIVEN("s1 <- sphere()")
{
Sphere *s1 = new Sphere;
AND_GIVEN("s1 is added to w")
{
w.add_object(s1);
AND_GIVEN("s2 <- sphere() with transform(translation(0, 0, 10))")
{
Sphere *s2 = new Sphere;
s2->set_transform(Matrix::translation(0, 0, 10));
AND_GIVEN("s2 is added to w")
{
w.add_object(s2);
AND_GIVEN("r <- ray(point(0, 0, 5), vector(0, 0, 1))")
{
Ray r(Tuple::Point(0, 0, 5), Tuple::Vector(0, 0, 1));
AND_GIVEN("i <- intersection(4, s2)")
{
Intersection i(4, *s2);
WHEN("comps <- prepare_computatons(i,r)")
{
IntersectionData comps = i.prepare_computations(r);
AND_WHEN("c <- shade_hit(w, comps)")
{
Color c = w.shade_hit(comps);
THEN("c = color (0.1, 0.1, 0.1)")
{
REQUIRE(c == Color(0.1, 0.1, 0.1));
}
}
}
}
}
}
}
}
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("The hit should offset the point", "[features/intersections.feature]")
{
GIVEN("r <- ray(point(0, 0, -5), vector(0, 0, 1))")
{
Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
AND_GIVEN("shape <- sphere()")
{
Sphere shape;
shape.set_transform(Matrix::translation(0, 0, 1));
AND_GIVEN("i <- intersection(5, shape)")
{
Intersection i(5, shape);
WHEN("comps <- prepare_computatons(i,r)")
{
IntersectionData comps = i.prepare_computations(r);
THEN("comps.over_point.z < -EPSILON/2")
{
REQUIRE(comps.over_point().z() < -kEpsilon / 2);
}
AND_THEN("comps.point.z < comps.over_point.z")
{
REQUIRE(comps.point().z() > comps.over_point().z());
}
}
}
}
}
}

1
tests/CMakeLists.txt
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@@ -18,6 +18,7 @@ add_executable(raytracing_test
05_rays.cpp
06_light_shading.cpp
07_making_scene.cpp
08_shadows.cpp
)
include_directories("${CMAKE_SOURCE_DIR}/tests")