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[FEAT] add tuple reflect

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NADAL Jean-Baptiste
2024-02-16 17:09:56 +01:00
parent 8c75d297a7
commit cb4149ae60
3 changed files with 53 additions and 0 deletions
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7
raytracing/src/tuple.cpp
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@@ -331,6 +331,13 @@ Tuple Tuple::cross(const Tuple &a_tuple)
/* ------------------------------------------------------------------------- */
Tuple Tuple::reflect(const Tuple &a_normal)
{
return *this - a_normal * 2 * dot(a_normal);
}
/* ------------------------------------------------------------------------- */
void Tuple::set_at_index(uint8_t an_index, double a_value)
{
if (an_index == 0)

2
raytracing/src/tuple.h
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@@ -87,6 +87,8 @@ namespace Raytracer
double dot(const Tuple &a_tuple);
Tuple cross(const Tuple &a_tuple);
Tuple reflect(const Tuple &a_normal);
private:
void set_at_index(uint8_t an_index, double a_value);

44
tests/06_light_shading.cpp
View File

@@ -168,3 +168,47 @@ SCENARIO("Computing the normal on a transformed sphere", "[features/spheres.feat
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("Reflecting a vector approaching at 45°", "[features/tuples.feature]")
{
GIVEN("v <-vector(1, -1, 0)")
{
Tuple v = Tuple::Vector(1, -1, 0);
AND_GIVEN("n <-vector(0, 1, 0)")
{
Tuple n = Tuple::Vector(0, 1, 0);
WHEN("r <- reflect(v,n)")
{
Tuple r = v.reflect(n);
THEN("r = vector(1,1,0)")
{
REQUIRE(r == Tuple::Vector(1, 1, 0));
}
}
}
}
}
/* ------------------------------------------------------------------------- */
SCENARIO("Reflecting a vector off a slanted surface", "[features/tuples.feature]")
{
GIVEN("v <-vector(0, -1, 0)")
{
Tuple v = Tuple::Vector(0, -1, 0);
AND_GIVEN("n <-vector(sqrt(2)/2, sqrt(2)/2, 0)")
{
Tuple n = Tuple::Vector(sqrt(2) / 2, sqrt(2) / 2, 0);
WHEN("r <- reflect(v,n)")
{
Tuple r = v.reflect(n);
THEN("r = vector(1,0,0)")
{
REQUIRE(r == Tuple::Vector(1, 0, 0));
}
}
}
}
}