convert equirectangular panoramas into cubemap tiles

script-erect2cubic-001.sh

#!/bin/bash

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# @johanjohan
# version 20200303
# loop over dirs looking for equirectangular panoramic png files
# and convert these equirectangular panoramas into cubemap tiles
# 
# erect2cubic --erect=equi.png --ptofile=cubic.pto
# nona -v -o cubicBasename cubic.pto
# 
# 0000 front 
# 0001 right
# 0002 back
# 0003 left
# 0004 top
# 0005 bottom
#
# https://metacpan.org/release/Panotools-Script
# erect2cubic - creates a hugin .pto file for converting equirectangular to cubic
# erect2mercator - Extract a mercator projection from an equirectangular image
# erect2planet - Extract a stereographic 'little planet' from an equirectangular image
# erect2qtvr - Assemble a Quicktime QTVR file from an equirectangular image 
#
# http://standard-input.blogspot.com/2009/09/convert-rectilinear-panoramas-to-cubic.html
# sudo apt-get update
# sudo apt-get update --fix-missing
# sudo apt-get upgrade
# sudo apt install hugin-tools
# sudo apt install libgraphviz-perl
#
# sudo cpan install CPAN
# sudo cpan App::cpanminus
#
# sudo perl -MCPAN -e shell
# 	install Term::ReadLine::Perl
# 	install Term::ReadKey
# 	install Panotools::Script
#
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### script path
# cd /mnt/v/00shared/dev8/OF/of_v0.9.8_vs_release/apps/STAUB_098/023-erect2cubic-linux
### pano path
# cd /mnt/s/GSV/trbovlje/data/sqlite/ofx3jGoogleStreetViewPanos/centerOnly_z4/t_panos_geoSpiral_hot2Chimney_5_00_m/google
 
# function to convert passed list  "$@"
foo() {
	for fullpath in "$@"
	do
		filename="${fullpath##*/}"                      # Strip longest match of */ from start
		dir="${fullpath:0:${#fullpath} - ${#filename}}" # Substring from 0 thru pos of filename
		base="${filename%.[^.]*}"                       # Strip shortest match of . plus at least one non-dot char from end
		ext="${filename:${#base} + 1}"                  # Substring from len of base thru end
		if [[ -z "$base" && -n "$ext" ]]; then          # If we have an extension and no base, it's really the base
			base=".$ext"
			ext=""
		fi

		echo -e "$fullpath:\n\tdir  = \"$dir\"\n\tbase = \"$base\"\n\text  = \"$ext\""
		
		# create pto
		pto=$dir$base".pto"
		echo -e "\tpto  = $pto\n"
		
		erect2cubic --erect=$fullpath --ptofile=$pto
		
		# create cubics -v
		cubicbase=$dir$base"_cubic_"
		nona -v -o $cubicbase $pto
		
	done
}
export -f foo
 
SEARCH_DIR="/mnt/s/GSV/trbovlje/data/sqlite/ofx3jGoogleStreetViewPanos/centerOnly_z4/t_panos_geoSpiral_hot2Chimney_5_00_m/google"
echo "SEARCH_DIR: $SEARCH_DIR"

# duration
SECONDS=0

# find pano .png files (exclude depth maps and cubics) and execute foo() with list of filenames
find  \
	 $SEARCH_DIR \
	-iname '*.png' \
	-not -name '*_depthMap*' \
	-not -name '*_cubic*' \
	-exec bash -c 'foo "$@"' bash {} +
	
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# takes about 8 seconds per pano of resolution 6k
duration=$SECONDS
echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds elapsed."
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echo ""
echo "all done. press return..."
read input_variable
exit 0

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