protected void UpdateDerivedMetrics()
{
mLoadRadiusInCells = mLoadRadius / mCellSize;
mHoldRadiusInCells = mHoldRadius / mCellSize;
mBottomLeft = mOrigin - new Vector2(mCellSize * mGridExtentsHorz * 0.5f,
mCellSize * mGridExtentsVert * 0.5f);
}