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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2012-2018 DreamWorks Animation LLC
//
// All rights reserved. This software is distributed under the
// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
//
// Redistributions of source code must retain the above copyright
// and license notice and the following restrictions and disclaimer.
//
// * Neither the name of DreamWorks Animation nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// IN NO EVENT SHALL THE COPYRIGHT HOLDERS' AND CONTRIBUTORS' AGGREGATE
// LIABILITY FOR ALL CLAIMS REGARDLESS OF THEIR BASIS EXCEED US$250.00.
//
///////////////////////////////////////////////////////////////////////////
#include <cppunit/extensions/HelperMacros.h>
#include <openvdb/Exceptions.h>
#include <openvdb/math/QuantizedUnitVec.h>
#include <openvdb/math/Math.h>
#include <openvdb/math/Vec3.h>
#include <sstream>
#include <algorithm>
#include <cmath>
#include <ctime>
class TestQuantizedUnitVec: public CppUnit::TestFixture
{
public:
CPPUNIT_TEST_SUITE(TestQuantizedUnitVec);
CPPUNIT_TEST(testQuantization);
CPPUNIT_TEST_SUITE_END();
void testQuantization();
private:
// Generate a random number in the range [0, 1].
double randNumber() { return double(rand()) / (double(RAND_MAX) + 1.0); }
};
CPPUNIT_TEST_SUITE_REGISTRATION(TestQuantizedUnitVec);
////////////////////////////////////////
namespace {
const uint16_t
MASK_XSIGN = 0x8000, // 1000000000000000
MASK_YSIGN = 0x4000, // 0100000000000000
MASK_ZSIGN = 0x2000; // 0010000000000000
}
////////////////////////////////////////
void
TestQuantizedUnitVec::testQuantization()
{
using namespace openvdb;
using namespace openvdb::math;
//
// Check sign bits
//
Vec3s unitVec = Vec3s(-1.0, -1.0, -1.0);
unitVec.normalize();
uint16_t quantizedVec = QuantizedUnitVec::pack(unitVec);
CPPUNIT_ASSERT((quantizedVec & MASK_XSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_YSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_ZSIGN));
unitVec[0] = -unitVec[0];
unitVec[2] = -unitVec[2];
quantizedVec = QuantizedUnitVec::pack(unitVec);
CPPUNIT_ASSERT(!(quantizedVec & MASK_XSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_YSIGN));
CPPUNIT_ASSERT(!(quantizedVec & MASK_ZSIGN));
unitVec[1] = -unitVec[1];
quantizedVec = QuantizedUnitVec::pack(unitVec);
CPPUNIT_ASSERT(!(quantizedVec & MASK_XSIGN));
CPPUNIT_ASSERT(!(quantizedVec & MASK_YSIGN));
CPPUNIT_ASSERT(!(quantizedVec & MASK_ZSIGN));
QuantizedUnitVec::flipSignBits(quantizedVec);
CPPUNIT_ASSERT((quantizedVec & MASK_XSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_YSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_ZSIGN));
unitVec[2] = -unitVec[2];
quantizedVec = QuantizedUnitVec::pack(unitVec);
QuantizedUnitVec::flipSignBits(quantizedVec);
CPPUNIT_ASSERT((quantizedVec & MASK_XSIGN));
CPPUNIT_ASSERT((quantizedVec & MASK_YSIGN));
CPPUNIT_ASSERT(!(quantizedVec & MASK_ZSIGN));
//
// Check conversion error
//
const double tol = 0.05; // component error tolerance
const int numNormals = 40000;
// init
srand(0);
const int n = int(std::sqrt(double(numNormals)));
const double xScale = (2.0 * M_PI) / double(n);
const double yScale = M_PI / double(n);
double x, y, theta, phi;
Vec3s n0, n1;
// generate random normals, by uniformly distributing points on a unit-sphere.
// loop over a [0 to n) x [0 to n) grid.
for (int a = 0; a < n; ++a) {
for (int b = 0; b < n; ++b) {
// jitter, move to random pos. inside the current cell
x = double(a) + randNumber();
y = double(b) + randNumber();
// remap to a lat/long map
theta = y * yScale; // [0 to PI]
phi = x * xScale; // [0 to 2PI]
// convert to cartesian coordinates on a unit sphere.
// spherical coordinate triplet (r=1, theta, phi)
n0[0] = float(std::sin(theta)*std::cos(phi));
n0[1] = float(std::sin(theta)*std::sin(phi));
n0[2] = float(std::cos(theta));
CPPUNIT_ASSERT_DOUBLES_EQUAL(1.0, n0.length(), 1e-6);
n1 = QuantizedUnitVec::unpack(QuantizedUnitVec::pack(n0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(1.0, n1.length(), 1e-6);
CPPUNIT_ASSERT_DOUBLES_EQUAL(n0[0], n1[0], tol);
CPPUNIT_ASSERT_DOUBLES_EQUAL(n0[1], n1[1], tol);
CPPUNIT_ASSERT_DOUBLES_EQUAL(n0[2], n1[2], tol);
float sumDiff = std::abs(n0[0] - n1[0]) + std::abs(n0[1] - n1[1])
+ std::abs(n0[2] - n1[2]);
CPPUNIT_ASSERT(sumDiff < (2.0 * tol));
}
}
}
// Copyright (c) 2012-2018 DreamWorks Animation LLC
// All rights reserved. This software is distributed under the
// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
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