assimp/test/unit/utMatrix3x3.cpp

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#include "UnitTestPCH.h"
#include <iostream>

using namespace ::Assimp;

class utMatrix3x3Test : public ::testing::Test {
    // empty
};

TEST_F(utMatrix3x3Test, FromToMatrixTest) {
    aiVector3D res;
    aiMatrix3x3 trafo;

    const double PRECISION = 0.000001;

    // axes test
    aiVector3D axes[] = { aiVector3D(1, 0, 0), aiVector3D(0, 1, 0), aiVector3D(0, 0, 1) };

    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            aiMatrix3x3::FromToMatrix(axes[i], axes[j], trafo);
            res = trafo * axes[i];

            ASSERT_NEAR(axes[j].x, res.x, PRECISION);
            ASSERT_NEAR(axes[j].y, res.y, PRECISION);
            ASSERT_NEAR(axes[j].z, res.z, PRECISION);
        }
    }

    // random test
    const int NUM_SAMPLES = 10000;

    aiVector3D from, to;

    auto random_ratio = []() -> float {
        return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
    };

    for (int i = 0; i < NUM_SAMPLES; ++i) {
        from = aiVector3D(
                1.f * random_ratio(),
                1.f * random_ratio(),
                1.f * random_ratio())
                       .Normalize();
        to = aiVector3D(
                1.f * random_ratio(),
                1.f * random_ratio(),
                1.f * random_ratio())
                     .Normalize();

        aiMatrix3x3::FromToMatrix(from, to, trafo);
        res = trafo * from;

        ASSERT_NEAR(to.x, res.x, PRECISION);
        ASSERT_NEAR(to.y, res.y, PRECISION);
        ASSERT_NEAR(to.z, res.z, PRECISION);
    }
}