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Refraction seems to work. Still need to do a nice scene.

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Godzil
2020-02-21 22:50:12 +00:00
parent df52cb36db
commit 3db0aaaeac
9 changed files with 274 additions and 16 deletions
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119
tests/world_test.cpp
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@@ -12,6 +12,7 @@
#include <material.h>
#include <transformation.h>
#include <worldbuilder.h>
#include <testpattern.h>
#include <math.h>
#include <gtest/gtest.h>
#include <plane.h>
@@ -255,6 +256,8 @@ TEST(WorldTest, Colour_at_with_mutually_reflective_surfaces)
/* It should just exit, we don't care about the actual colour */
w.colourAt(r);
SUCCEED();
}
TEST(WorldTest, The_reflected_colour_at_the_maximum_recursion_depth)
@@ -273,4 +276,120 @@ TEST(WorldTest, The_reflected_colour_at_the_maximum_recursion_depth)
/* Temporary lower the precision */
ASSERT_EQ(colour, Colour(0, 0, 0));
}
TEST(WorldTest, The_refracted_colour_with_an_opaque_surface)
{
World w = DefaultWorld();
Shape *shape = w.getObject(0);
Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
Intersect xs = Intersect();
xs.add(Intersection(4, shape));
xs.add(Intersection(6, shape));
Computation comps = xs[0].prepareComputation(r, &xs);
Colour c = w.refractedColour(comps, 5);
ASSERT_EQ(c, Colour(0, 0, 0));
}
TEST(WorldTest, The_refracted_colour_at_the_maximum_recursive_depth)
{
World w = DefaultWorld();
Shape *shape = w.getObject(0);
shape->material.transparency = 1.0;
shape->material.refractiveIndex = 1.5;
Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
Intersect xs = Intersect();
xs.add(Intersection(4, shape));
xs.add(Intersection(6, shape));
Computation comps = xs[0].prepareComputation(r, &xs);
Colour c = w.refractedColour(comps, 0);
ASSERT_EQ(c, Colour(0, 0, 0));
}
TEST(WorldTest, The_refracted_colour_under_total_internal_reflection)
{
World w = DefaultWorld();
Shape *shape = w.getObject(0);
shape->material.transparency = 1.0;
shape->material.refractiveIndex = 1.5;
Ray r = Ray(Point(0, 0, sqrt(2)/2), Vector(0, 1, 0));
Intersect xs = Intersect();
xs.add(Intersection(-sqrt(2)/2, shape));
xs.add(Intersection(sqrt(2)/2, shape));
Computation comps = xs[1].prepareComputation(r, &xs);
Colour c = w.refractedColour(comps, 5);
ASSERT_EQ(c, Colour(0, 0, 0));
}
TEST(WorldTest, The_refracted_coloud_with_a_refracted_ray)
{
World w = DefaultWorld();
Shape *A = w.getObject(0);
A->material.ambient = 1.0;
A->material.pattern = new TestPattern();
Shape *B = w.getObject(1);
B->material.transparency = 1.0;
B->material.refractiveIndex = 1.5;
Ray r = Ray(Point(0, 0, 0.1), Vector(0, 1, 0));
Intersect xs = Intersect();
xs.add(Intersection(-0.9899, A));
xs.add(Intersection(-0.4899, B));
xs.add(Intersection(0.4899, B));
xs.add(Intersection(0.9899, A));
Computation comps = xs[2].prepareComputation(r, &xs);
Colour c = w.refractedColour(comps, 5);
/* Temporary lower the precision */
set_equal_precision(0.00005);
ASSERT_EQ(c, Colour(0, 0.99888, 0.04725));
set_equal_precision(FLT_EPSILON);
}
TEST(WorldTest, Shade_hit_with_a_transparent_material)
{
World w = DefaultWorld();
Plane floor = Plane();
floor.setTransform(translation(0, -1, 0));
floor.material.transparency = 0.5;
floor.material.refractiveIndex = 1.5;
w.addObject(&floor);
Sphere ball = Sphere();
ball.material.colour = Colour(1, 0, 0);
ball.material.ambient = 0.5;
ball.setTransform(translation(0, -3.5, -0.5));
w.addObject(&ball);
Ray r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2)/2, sqrt(2)/2));
Intersect xs = Intersect();
xs.add(Intersection(sqrt(2), &floor));
Computation comps = xs[0].prepareComputation(r, &xs);
Tuple c = w.shadeHit(comps, 5);
/* Temporary lower the precision */
set_equal_precision(0.00001);
ASSERT_EQ(c, Colour(0.93642, 0.68642, 0.68642));
set_equal_precision(FLT_EPSILON);
}