TEST_CASE_F(TransformToSpectrum_GivenSpectrum_DoesNothing, Fixture)
{
ShadingResult result;
result.m_color_space = ColorSpaceSpectral;
result.m_color.set(0.0f);
result.transform_to_spectrum(m_lighting_conditions);
EXPECT_EQ(ColorSpaceSpectral, result.m_color_space);
EXPECT_EQ(Spectrum(0.0f), result.m_color);
}
TEST_CASE_F(TransformToSpectrum_FromCIEXYZ, Fixture)
{
ShadingResult result;
result.m_color_space = ColorSpaceCIEXYZ;
result.m_color[0] = result.m_color[1] = result.m_color[2] = 0.0f;
result.transform_to_spectrum(m_lighting_conditions);
EXPECT_EQ(ColorSpaceSpectral, result.m_color_space);
EXPECT_EQ(Spectrum(0.0f), result.m_color);
}
void apply_aerial_perspective(
const InputValues& values,
const ShadingContext& shading_context,
const ShadingPoint& shading_point,
ShadingResult& shading_result) const
{
Spectrum sky_color;
if (m_aerial_persp_mode == AerialPerspSkyColor)
sky_color = values.m_aerial_persp_sky_color;
else
{
// Retrieve the environment shader of the scene.
const Scene& scene = shading_point.get_scene();
const EnvironmentShader* environment_shader =
scene.get_environment()->get_environment_shader();
if (environment_shader)
{
// Execute the environment shader to obtain the sky color in the direction of the ray.
InputEvaluator input_evaluator(shading_context.get_texture_cache());
const ShadingRay& ray = shading_point.get_ray();
const Vector3d direction = normalize(ray.m_dir);
ShadingResult sky;
environment_shader->evaluate(input_evaluator, direction, sky);
sky.transform_to_spectrum(m_lighting_conditions);
sky_color = sky.m_main.m_color;
}
else sky_color.set(0.0f);
}
// Compute the blend factor.
const double d = shading_point.get_distance() * m_aerial_persp_rcp_distance;
const double k = m_aerial_persp_intensity * exp(d);
const double blend = min(k, 1.0);
// Blend the shading result and the sky color.
sky_color *= static_cast<float>(blend);
shading_result.m_main.m_color *= static_cast<float>(1.0 - blend);
shading_result.m_main.m_color += sky_color;
}