Function generateSphere

components/debug/debugdraw.cpp:219–268

}

static void generateSphere(osg::Geometry& geom, float radius, int segments, int rings)
{
    osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
    osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array;
    osg::ref_ptr<osg::DrawElementsUShort> indices = new osg::DrawElementsUShort(osg::DrawElementsUShort::TRIANGLES, 0);
    int vertexCount = segments * (rings + 1);
    vertices->reserve(vertexCount);
    normals->reserve(vertexCount);
    int indexCount = segments * rings * 2 * 3;
    indices->reserve(indexCount);

    for (int i = 0; i <= rings; ++i)
    {
        float phi = (float(i) / float(rings)) * osg::PIf;
        for (int j = 0; j < segments; ++j)
        {
            float theta = (float(j) / float(segments)) * osg::PIf * 2.f;
            auto pos = sphereCoordToCartesian(theta, phi, radius);
            vertices->push_back(pos);
            pos.normalize();
            normals->push_back(pos);
        }
    }

    for (int i = 0; i < rings; ++i)
    {
        int ringTopBase = i * segments;
        int ringBottomBase = ringTopBase + segments;

        for (int j = 0; j < segments; ++j)
        {
            auto v1 = static_cast<GLushort>(ringTopBase + j);
            auto v2 = static_cast<GLushort>(ringTopBase + (j + 1) % segments);
            auto v3 = static_cast<GLushort>(ringBottomBase + j);
            auto v4 = static_cast<GLushort>(ringBottomBase + (j + 1) % segments);

            indices->push_back(v1);
            indices->push_back(v4);
            indices->push_back(v2);

            indices->push_back(v4);
            indices->push_back(v1);
            indices->push_back(v3);
        }
    }

    geom.setVertexArray(vertices);
    geom.setNormalArray(normals, osg::Array::BIND_PER_VERTEX);
    geom.addPrimitiveSet(indices);
}

static int getIndexBufferReadFromFrame(const unsigned int& nFrame)
{