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% Copyright (c) 2023, ETH Zurich and UNC Chapel Hill.
% All rights reserved.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are met:
%
% * Redistributions of source code must retain the above copyright
% notice, this list of conditions and the following disclaimer.
%
% * Redistributions in binary form must reproduce the above copyright
% notice, this list of conditions and the following disclaimer in the
% documentation and/or other materials provided with the distribution.
%
% * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
% its contributors may be used to endorse or promote products derived
% from this software without specific prior written permission.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
% POSSIBILITY OF SUCH DAMAGE.
function [normal_map, normal_map_rgb] = read_normal_map(path, varargin)
normal_map = read_array(path);
normal_map_rgb = -[normal_map(:,:,1) normal_map(:,:,2) ...
2 * normal_map(:,:,3) + 1];
normal_map_rgb = reshape(normal_map_rgb, ...
size(normal_map,1), size(normal_map,2), 3);
normal_map_rgb = uint8(((normal_map_rgb + 1) ./ 2) .* 255);
if length(varargin) == 1
depth_map = varargin{1};
normal_map_rgb(repmat(isnan(depth_map), [1, 1, 3])) = 0;
end
end
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