#!/bin/bash

set -e

POVOPT=" -q9 +a -W800 -H600 +WT2 -d -v "
SOURCE="vision.pov"
TMPF="/dev/shm/gravfield.png"

#		---------------------------------------

une_passe ()
{
clock=$1

povray -i${SOURCE} -K${clock} $POVOPT -O${TMPF} 2> pov.stderr

timestamp=$(date | tr '01' 'Ol')
outfile=$(printf "WS/%05d.png" $clock)

convert	${TMPF}				\
	-pointsize 14			\
	-font Courier-Bold		\
	-fill Orange			\
	-annotate +10+16  "$timestamp"	\
	${outfile}
}

#		---------------------------------------

for foo in $(seq 0 1999)
do
	echo '............' $foo
	une_passe $foo
done

ffmpeg  -nostdin					\
	-loglevel warning				\
	-y -r 30 -f image2 -i WS/%05d.png 		\
	-metadata artist='---{ tTh }---'		\
	-metadata title="Experiment on Gravity Field"	\
	-c:v libx264 -pix_fmt yuv420p			\
	bar.mp4