CGI/exercise4/include/GridUtils.h

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2018-09-06 12:35:43 +00:00
// This source code is property of the Computer Graphics and Visualization
// chair of the TU Dresden. Do not distribute!
// Copyright (C) CGV TU Dresden - All Rights Reserved
#pragma once
#include <array>
#include <Eigen/Core>
//converts 3d floating point position pos into 3d integer grid cell index
inline Eigen::Vector3i PositionToCellIndex(const Eigen::Vector3f& pos, const Eigen::Vector3f& cellExtents)
{
Eigen::Vector3i idx;
for(int d = 0; d < 3; ++d)
{
idx[d] = int(pos[d]/cellExtents[d]);
if (pos[d] < 0)
--idx[d];
}
return idx;
}
//returns true if the two Interval [lb1,ub2] and [lb2,ub2] overlap
inline bool OverlapIntervals(float lb1, float ub1, float lb2, float ub2)
{
if(lb1 > ub1)
std::swap(lb1,ub1);
if(lb2 > ub2)
std::swap(lb2,ub2);
if(ub1 < lb2|| lb1 >ub2)
return false;
return true;
}