input="compass_arrow.svg"
size=64
angles=9
for rot in `seq 0 $((angles - 1))`; do
    #inkscape -w ${size} -h ${size} compass_arrow.svg -o "$out"
    angle=$((90 / angles * rot))
    out="textures/waypoint_compass_arrow_"$(printf "%03d" $angle)".png"
    convert -density 384 -background none -distort SRT $angle -gravity center -resize ${size}x${size} "$input" "$out"
done