assimp/test/unit/utFindDegenerates.cpp

/*
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Open Asset Import Library (assimp)
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#include "UnitTestPCH.h"

#include "PostProcessing/FindDegenerates.h"

using namespace std;
using namespace Assimp;

class FindDegeneratesProcessTest : public ::testing::Test {
public:
    virtual void SetUp();
    virtual void TearDown();

protected:
    aiMesh* mesh;
    FindDegeneratesProcess* process;
};

// ------------------------------------------------------------------------------------------------
void FindDegeneratesProcessTest::SetUp() {
    mesh = new aiMesh();
    process = new FindDegeneratesProcess();

    mesh->mNumFaces = 1000;
    mesh->mFaces = new aiFace[1000];

    mesh->mNumVertices = 5000*2;
    mesh->mVertices = new aiVector3D[5000*2];

    for (unsigned int i = 0; i < 5000; ++i) {
        mesh->mVertices[i] = mesh->mVertices[i+5000] = aiVector3D((float)i);
    }

    mesh->mPrimitiveTypes = aiPrimitiveType_LINE | aiPrimitiveType_POINT |
    aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE;

    unsigned int numOut = 0, numFaces = 0;
    for (unsigned int i = 0; i < 1000; ++i) {
        aiFace& f = mesh->mFaces[i];
    f.mNumIndices = (i % 5)+1; // between 1 and 5
    f.mIndices = new unsigned int[f.mNumIndices];
    bool had = false;
    for (unsigned int n = 0; n < f.mNumIndices;++n) {
        // FIXME
#if 0
        // some duplicate indices
        if ( n && n == (i / 200)+1) {
            f.mIndices[n] = f.mIndices[n-1];
            had = true;
        }
        // and some duplicate vertices
#endif
        if (n && i % 2 && 0 == n % 2) {
            f.mIndices[n] = f.mIndices[n-1]+5000;
            had = true;
        }
        else {
            f.mIndices[n] = numOut++;
            }
        }
        if (!had)
            ++numFaces;
    }
    mesh->mNumUVComponents[0] = numOut;
    mesh->mNumUVComponents[1] = numFaces;
}

void FindDegeneratesProcessTest::TearDown() {
    delete mesh;
    delete process;
}

TEST_F(FindDegeneratesProcessTest, testDegeneratesDetection) {
    process->EnableInstantRemoval(false);
    process->ExecuteOnMesh(mesh);

    unsigned int out = 0;
    for (unsigned int i = 0; i < 1000; ++i) {
        aiFace& f = mesh->mFaces[i];
        out += f.mNumIndices;
    }

    EXPECT_EQ(1000U, mesh->mNumFaces);
    EXPECT_EQ(10000U, mesh->mNumVertices);
    EXPECT_EQ(out, mesh->mNumUVComponents[0]);
    EXPECT_EQ(static_cast<unsigned int>(
                  aiPrimitiveType_LINE | aiPrimitiveType_POINT |
                  aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE),
              mesh->mPrimitiveTypes);
}

TEST_F(FindDegeneratesProcessTest, testDegeneratesRemoval) {
    process->EnableAreaCheck(false);
    process->EnableInstantRemoval(true);
    process->ExecuteOnMesh(mesh);

    EXPECT_EQ(mesh->mNumUVComponents[1], mesh->mNumFaces);
}

TEST_F(FindDegeneratesProcessTest, testDegeneratesRemovalWithAreaCheck) {
    process->EnableAreaCheck(true);
    process->EnableInstantRemoval(true);
    process->ExecuteOnMesh(mesh);

    EXPECT_EQ(mesh->mNumUVComponents[1]-100, mesh->mNumFaces);
}