tadd two-grain collision example - granular - granular dynamics simulation
 (HTM) git clone git://src.adamsgaard.dk/granular
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       ---
 (DIR) commit ad3e64425c18a35f07606f42c4a2319edbd5b2ab
 (DIR) parent ac0900f4a7a870c7b5636bb32a0b5de012ba6736
 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Fri, 23 Apr 2021 09:54:41 +0200
       
       add two-grain collision example
       
       Diffstat:
         A examples/collision.sh               |      18 ++++++++++++++++++
       
       1 file changed, 18 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/examples/collision.sh b/examples/collision.sh
       t@@ -0,0 +1,18 @@
       +#!/bin/sh
       +set -e
       +
       +id=collision
       +
       +rm -f ${id}.grains.*.{tsv,png} ${id}.mp4
       +
       +(granulargrain -R -u 0.1; granulargrain -f -x 1.2) | granular -e 4.0 -I 0.1 ${id}
       +
       +for f in ${id}.grains.*.tsv; do
       +        #./granular2img -f '$50' -l 'number of contacts' -t png < "$f" > "${f%.tsv}.png"
       +        #./granular2img -f '$5' -l 'x velocity [m/s]' -t png < "$f" > "${f%.tsv}.png"
       +        ./granular2img -f '$14' -l 'force_x [N]' -t png < "$f" > "${f%.tsv}.png"
       +done
       +
       +ffmpeg -y -framerate 5 -i ${id}.grains.%05d.png \
       +        -c:v libx264 -r 30 -pix_fmt yuv420p ${id}.mp4
       +xdg-open ${id}.mp4