test_samplers.cpp
/*
This file is part of Mitsuba, a physically based rendering system.
Copyright (c) 2007-2014 by Wenzel Jakob and others.
Mitsuba is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License Version 3
as published by the Free Software Foundation.
Mitsuba 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mitsuba/render/testcase.h>
#include <mitsuba/core/plugin.h>
#include <mitsuba/core/qmc.h>
MTS_NAMESPACE_BEGIN
class TestSamplers : public TestCase {
public:
MTS_BEGIN_TESTCASE()
MTS_DECLARE_TEST(test01_Halton)
MTS_DECLARE_TEST(test02_Hammersley)
MTS_DECLARE_TEST(test03_radicalInverseIncr)
MTS_END_TESTCASE()
void test01_Halton() {
ref<Sampler> sampler = static_cast<Sampler *> (PluginManager::getInstance()->
createObject(MTS_CLASS(Sampler), Properties("halton")));
/* MATLAB: p = haltonset(5); net(p,5) */
Float comparison[] = {
0, 0, 0, 0, 0,
0.500000000000000, 0.333333333333333, 0.200000000000000, 0.142857142857143, 0.090909090909091,
0.250000000000000, 0.666666666666667, 0.400000000000000, 0.285714285714286, 0.181818181818182,
0.750000000000000, 0.111111111111111, 0.600000000000000, 0.428571428571429, 0.272727272727273,
0.125000000000000, 0.444444444444444, 0.800000000000000, 0.571428571428571, 0.363636363636364
};
int pos = 0;
sampler->generate(Point2i(0));
for (int i=0; i<5; ++i) {
for (int j=0; j<5; ++j)
assertEqualsEpsilon(sampler->next1D(), comparison[pos++], 1e-7);
sampler->advance();
}
}
void test02_Hammersley() {
Properties props("hammersley");
props.setInteger("sampleCount", 5);
ref<Sampler> sampler = static_cast<Sampler *> (PluginManager::getInstance()->
createObject(MTS_CLASS(Sampler), props));
Float comparison[] = {
0.0, 0, 0, 0, 0, 0,
1.0/5.0, 0.500000000000000, 0.333333333333333, 0.200000000000000, 0.142857142857143, 0.090909090909091,
2.0/5.0, 0.250000000000000, 0.666666666666667, 0.400000000000000, 0.285714285714286, 0.181818181818182,
3.0/5.0, 0.750000000000000, 0.111111111111111, 0.600000000000000, 0.428571428571429, 0.272727272727273,
4.0/5.0, 0.125000000000000, 0.444444444444444, 0.800000000000000, 0.571428571428571, 0.363636363636364
};
int pos = 0;
sampler->generate(Point2i(0));
for (int i=0; i<5; ++i) {
for (int j=0; j<6; ++j)
assertEqualsEpsilon(sampler->next1D(), comparison[pos++], 1e-7);
sampler->advance();
}
}
void test03_radicalInverseIncr() {
Float x = 0.0f;
for (int i=0; i<20; ++i) {
assertEqualsEpsilon(x, radicalInverse(2, i), 0);
x = radicalInverseIncremental(2, x);
}
}
};
MTS_EXPORT_TESTCASE(TestSamplers, "Testcase for sampling-related code")
MTS_NAMESPACE_END