Geometry: Create a Geometry Model

The geometry model offers optimized part drawing with different parts and effects.

This example creates two triangle parts and two polyline parts. The second triangle and the second polyline will have the halo effect applied.

void TutorialRunnerMainWindow::createGeometryModel()
{
    //--------------------------------------------------------------------------
    // Create a geometry model with triangles and lines
    //--------------------------------------------------------------------------

    cee::vis::View* gcView = getTutorialView();
    gcView->removeAllModels();

    // Create the geometry model
    cee::PtrRef<cee::geo::GeometryModel> gcgeoModel = new cee::geo::GeometryModel();
    gcView->addModel(gcgeoModel.get());


    //--------------------------------------------------------------------------
    // Create vertices and indices for all parts
    //--------------------------------------------------------------------------

    // Triangle vertices and indices
    std::vector<cee::Vec3d> triangleVertices;
    triangleVertices.push_back(cee::Vec3d(0.0, 0.0, 2.0));
    triangleVertices.push_back(cee::Vec3d(2.0, 0.0, 2.0));
    triangleVertices.push_back(cee::Vec3d(1.0, 0.0, 3.0));
    std::vector<unsigned int> triangleIndices = { 0, 1, 2 };

    // First polyline vertices
    std::vector<cee::Vec3d> firstPolylinesVertices;
    firstPolylinesVertices.push_back(cee::Vec3d(0.0, 0.0,  0.0));
    firstPolylinesVertices.push_back(cee::Vec3d(1.0, 0.0,  0.0));
    firstPolylinesVertices.push_back(cee::Vec3d(1.5, 0.0,  1.0));
    firstPolylinesVertices.push_back(cee::Vec3d(0.0, 0.0, -1.0));
    firstPolylinesVertices.push_back(cee::Vec3d(1.0, 0.0, -1.0));
    firstPolylinesVertices.push_back(cee::Vec3d(1.5, 0.0,  0.0));

    // Second polyline vertices
    std::vector<cee::Vec3d> secondPolylinesVertices;
    secondPolylinesVertices.push_back(cee::Vec3d(2.0, 0.0,  0.0));
    secondPolylinesVertices.push_back(cee::Vec3d(3.0, 0.0,  0.0));
    secondPolylinesVertices.push_back(cee::Vec3d(3.5, 0.0,  1.0));
    secondPolylinesVertices.push_back(cee::Vec3d(2.0, 0.0, -1.0));
    secondPolylinesVertices.push_back(cee::Vec3d(3.0, 0.0, -1.0));
    secondPolylinesVertices.push_back(cee::Vec3d(3.5, 0.0,  0.0));

    // Polyline indices
    std::vector<unsigned int> firstLineIndices = { 0, 1, 2 };
    std::vector<unsigned int> secondLineIndices = { 3, 4, 5 };
    std::vector<std::vector<unsigned int> > polylinesIndices;
    polylinesIndices.push_back(firstLineIndices);
    polylinesIndices.push_back(secondLineIndices);


    //--------------------------------------------------------------------------
    // Create all data parts
    //--------------------------------------------------------------------------

    // Create a triangle data part using the vertices and connectivities
    cee::PtrRef<cee::geo::DataIndexedTriangles> triangleDataPart = new cee::geo::DataIndexedTriangles();
    triangleDataPart->setVertices(triangleVertices);
    triangleDataPart->setIndices(triangleIndices);

    // Create first polyline data part using the vertices and connectivities
    cee::PtrRef<cee::geo::DataIndexedPolylines> firstLinePartData = new cee::geo::DataIndexedPolylines();
    firstLinePartData->setVertices(firstPolylinesVertices);
    firstLinePartData->setPolylinesIndices(polylinesIndices);

    // Create second polyline data part using the vertices and connectivities
    cee::PtrRef<cee::geo::DataIndexedPolylines> secondLinePartData = new cee::geo::DataIndexedPolylines();
    secondLinePartData->setVertices(secondPolylinesVertices);
    secondLinePartData->setPolylinesIndices(polylinesIndices);


    //--------------------------------------------------------------------------
    // Create all parts
    //--------------------------------------------------------------------------

    // First triangle
    cee::PtrRef<cee::geo::Part> trianglePart = new cee::geo::Part();
    trianglePart->setData(triangleDataPart.get());

    // Second triangle (transformed)
    cee::PtrRef<cee::geo::Part> transformedTrianglePart = new cee::geo::Part();
    transformedTrianglePart->setData(triangleDataPart.get());
    transformedTrianglePart->setTransformation(cee::Mat4d::fromTranslation(cee::Vec3d(3.0, 0.0, 0.0)));

    // First polyline
    cee::PtrRef<cee::geo::Part> firstLinePart = new cee::geo::Part();
    firstLinePart->setData(firstLinePartData.get());

    // Second polyline
    cee::PtrRef<cee::geo::Part> secondLinePart = new cee::geo::Part();
    secondLinePart->setData(secondLinePartData.get());


    //--------------------------------------------------------------------------
    // Create effects
    //--------------------------------------------------------------------------

    // Create a color effect
    cee::PtrRef<cee::geo::EffectColor> triangleColorEffect = new cee::geo::EffectColor();
    triangleColorEffect->setColor(cee::Color3f(1.0f, 0.0f, 0.0f));

    // Create a color effect
    cee::PtrRef<cee::geo::EffectColor> lineColorEffect = new cee::geo::EffectColor();
    lineColorEffect->setColor(cee::Color3f(0.0, 0.0, 1.0));

    // Create a halo effect
    cee::PtrRef<cee::geo::EffectHalo> haloEffect = new cee::geo::EffectHalo();


    //--------------------------------------------------------------------------
    // Add effects to parts
    //--------------------------------------------------------------------------

    // First triangle has color effect
    trianglePart->settings().addEffect(triangleColorEffect.get());

    // Second triangle has color and a halo effect
    transformedTrianglePart->settings().addEffect(triangleColorEffect.get());
    transformedTrianglePart->settings().addEffect(haloEffect.get());

    // First polyline has line effect
    firstLinePart->settings().addEffect(lineColorEffect.get());

    // Second polyline has line and halo effect
    secondLinePart->settings().addEffect(lineColorEffect.get());
    secondLinePart->settings().addEffect(haloEffect.get());


    //--------------------------------------------------------------------------
    // Add all parts to model
    //--------------------------------------------------------------------------
    gcgeoModel->addPart(trianglePart.get());
    gcgeoModel->addPart(transformedTrianglePart.get());
    gcgeoModel->addPart(firstLinePart.get());
    gcgeoModel->addPart(secondLinePart.get());

    cee::BoundingBox bb = gcView->boundingBox();
    gcView->camera().fitView(bb, cee::Vec3d(0, 1, 0), cee::Vec3d(0, 0, 1));
    gcView->camera().inputHandler()->setRotationPoint(bb.center());

    gcView->requestRedraw();
}