a simple bash tool converting model

model_converter.sh

#!/bin/bash    

# Author Yibo Jiang
# Contact: yibojiang00@gmail.com

# Assimp
# License 3-clause BSD-License. Copyright (c) 2006-2015 assimp team All rights reserved..


function list {
	echo "
Support model formats:

	Autodesk ( fbx )
	Collada ( dae )
	glTF ( gltf, glb )
	Blender 3D ( blend )
	3ds Max 3DS ( 3ds )
	3ds Max ASE ( ase )
	Wavefront Object ( obj )
	Industry Foundation Classes (IFC/Step) ( ifc )
	XGL ( xgl,zgl )
	Stanford Polygon Library ( ply )
	AutoCAD DXF ( dxf )
	LightWave ( lwo )
	LightWave Scene ( lws )
	Modo ( lxo )
	Stereolithography ( stl )
	DirectX X ( x )
	AC3D ( ac )
	Milkshape 3D ( ms3d )
	TrueSpace ( cob, scn )

Support export formats:

	Collada ( dae )
	X Files ( x )
	Step Files ( stp )
	Wavefront OBJ format ( obj )
	Stereolithography ( binary) ( stl )
	Stanford Polygon Library ( stp )
	Stanford Polygon Library ( binary ) ( plyb )
	Autodesk 3DS ( legacy) ( 3ds )
	GL Transmission Format ( gltf )
	GL Transmission Format ( binary ) ( glb )
	Assimp Binary ( assbin )
	Assxml Document ( xml )
	Extensible 3D ( x3d )
"
	exit 1
}

function install_assimp {
	LIB=$HOME/"lib"
	FILE="libassimp.3.3.1 3.dylib"
	ALIAS_FILE="libassimp.3.dylib"
	ALIAS_FILE2="libassimp.dylib"
	FILE_PATH=$LIB/$FILE
	# echo $FILE_PATH
	if [ -f $FILE_PATH ]; then
		echo "No need to cp the libassimp.3.dylib, already exists."
		echo ""
	else
		if [[ -d ${LIB} ]]; then
			# echo "${LIB} exists"
			echo ""
		else
			echo "${LIB} doesn't exists, create one."
			mkdir ${LIB}
		fi

		ln "$FILE" "$LIB/$ALIAS_FILE"
		ln "$FILE" "$LIB/$ALIAS_FILE2"
		ln "$FILE" "$LIB/$FILE"
		echo "ln $FILE $LIB/$ALIAS_FILE"
		echo "ln $FILE $LIB/$ALIAS_FILE2"
		echo "ln $FILE $LIB/$FILE"
	fi
}

function usage {
	
   cat << EOF
Usage: 
  ./converter.sh -i                                                      = Install assimp library.
  ./converter.sh -l                                                      = List all supported model formats.
  ./converter.sh -f <export_format> -s <src_folder> -r <dist_folder>     = Batch Export the models with specific format.

Example:
  ./converter.sh -f obj -s test/ -d export/

EOF
	say "check the usage"
   # exit 1
}

if [[ "$#" -eq 0 ]]; then
	echo "
This is a program for batch model to a specific format. 
Contact Yibo Jiang or sent email to yibojiang00@gmail.com if you meet any problems.
Before using the shell, you have to install by calling ./converter.sh -i
"
	usage
	say "Contact Yibo Jiang or sent email to yibojiang00@gmail.com if you meet any problems."
	exit 1
fi

while getopts “ilf:s:d:” OPTION
do
 case $OPTION in
 	i)
		install_assimp
		exit 1
		;;
  l)
    list
    exit 1
    ;;
  f)
    FORMAT=$OPTARG
    ;;
  s)
		SRC=$OPTARG
		;;
	d)
		DEST=$OPTARG
		;;
	?)
		usage
		exit
		;;
 esac
done

install_assimp

if [[ -d ${SRC} ]]; then
	echo "Reading models from ${SRC}"
	say "Reading models from ${SRC}"
else
	echo "Invalid src Path ${SRC}"
	say "Invalid src Path ${SRC}"
	exit 1
fi

if [[ -d ${DEST} ]]; then
	echo "Exporting models to ${DEST}"
	say "Exporting models to ${DEST}"
else
	echo "Invalid dest Path ${DEST}"
	exit 1
fi

for f in $SRC/*;
do 
	xpath=${f%/*} 
	xbase=${f##*/}
	xfext=${xbase##*.}
	xpref=${xbase%.*}
	# echo;echo path=${xpath};echo pref=${xpref};echo ext=${xfext}
	echo "export to $DEST/$xpref.$FORMAT "
	# say "export to $DEST/$xpref.$FORMAT "
	./assimp export $f $DEST/$xpref.$FORMAT -f$FORMAT
	# rm $DEST/$xpref.$FORMAT.mtl

done

@yibojiang How do I get the file "libassimp.3.3.1 3.dylib"?