diff --git a/tools/darkroom/darkcult.py b/tools/darkroom/darkcult.py
index d164af70..fa538899 100755
--- a/tools/darkroom/darkcult.py
+++ b/tools/darkroom/darkcult.py
@@ -10,29 +10,46 @@ import sys
 import optparse
 import subprocess
 import multiprocessing
+import logging
+import tty
 
-def compile(command):
+def build(command):
 	sys.stdout.write(".")
 	sys.stdout.flush()
 	return subprocess.call(command, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
 
+def continue_build(command):
+	if command[2]:
+		sys.stdout.write("*")
+		sys.stdout.flush()
+		return 0
+	sys.stdout.write(".")
+	sys.stdout.flush()
+	result = subprocess.call(command[0], shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+	logging.critical(command[1])
+	return result
+
 def main():
 	parser = optparse.OptionParser(description='darkcult.py')
-	parser.add_option('--src', type='string')
-	parser.add_option('--stagedir', type='string')
-	parser.add_option('--output', type='string')
-	parser.add_option('--compiler', type='string')
-	parser.add_option('--width', type='int')
-	parser.add_option('--height', type='int')
-	parser.add_option('--tile_width', type='int')
-	parser.add_option('--tile_height', type='int')
-	parser.add_option('--compile_options', type='string')
+	parser.add_option('--source', type='string', default='../../example/darkroom/two_spheres.hpp')
+	parser.add_option('--stagedir', type='string', default='darkroom')
+	parser.add_option('--output', type='string', default='out.ppm')
+	parser.add_option('--compiler', type='string', default='g++')
+	parser.add_option('--width', type='int', default=16)
+	parser.add_option('--height', type='int', default=16)
+	parser.add_option('--tile_width', type='int', default=16)
+	parser.add_option('--tile_height', type='int', default=16)
+	parser.add_option('--left', type='int', default=0)
+	parser.add_option('--top', type='int', default=0)
+	parser.add_option('--right', type='int')
+	parser.add_option('--bottom', type='int')
+	parser.add_option('--compile_options', type='string', default='')
 	parser.add_option('--darkcult_cpp', type='string')
-	parser.add_option('--max_procs', type='int')
+	parser.add_option('--continuable', type='int', default=0)
+	parser.add_option('--continue_file', type='string', default='continue.log')
+	parser.add_option('--max_procs', type='int', default=0)
 	(opts, args) = parser.parse_args()
 
-	pool = multiprocessing.Pool(opts.max_procs if opts.max_procs != 0 else None)
-
 	def format_command(x, y):
 		bin = "%s/%d/%d.out" % (opts.stagedir, y, x)
 		out = "%s/%d/%d.ppm" % (opts.stagedir, y, x)
@@ -46,20 +63,58 @@ def main():
 			" && %s > %s" \
 			% (opts.compiler, bin,
 				opts.compile_options,
-				opts.src,
+				opts.source,
 				opts.width, opts.height,
 				opts.tile_width, opts.tile_height,
 				x, y,
 				opts.darkcult_cpp,
 				bin, out
 				)
-	return any(pool.map(
-		compile,
-		[format_command(x, y)
-			for y in range(0, opts.height, opts.tile_height)
-			for x in range(0, opts.width, opts.tile_width)
-			]
-		))
+
+	if opts.continuable:
+		logging.basicConfig(
+			filename=opts.continue_file,
+			format="%(message)s"
+			)
+		completed = [line.strip() for line in open(opts.continue_file)]
+
+		fd = sys.stdin.fileno()
+		tc_old = tty.tcgetattr(fd)
+		tty.setcbreak(fd)
+
+		def format_continue_command(x, y):
+			key = "%d %d" % (x, y)
+			return (format_command(x, y), key, key in completed)
+
+		pool = multiprocessing.Pool(opts.max_procs if opts.max_procs != 0 else None)
+		try:
+			results = pool.map_async(
+				continue_build,
+				[format_continue_command(x, y)
+					for y in range(opts.top, opts.bottom, opts.tile_height)
+					for x in range(opts.left, opts.right, opts.tile_width)
+					]
+				)
+			while True:
+				code = sys.stdin.read(1)
+				if results.ready():
+					break
+				if code == 'q':
+					pool.terminate()
+					return 2
+			return any(results.get())
+		finally:
+			tty.tcsetattr(fd, tty.TCSADRAIN, tc_old)
+			logging.shutdown()
+	else:
+		pool = multiprocessing.Pool(opts.max_procs if opts.max_procs != 0 else None)
+		return any(pool.map(
+			build,
+			[format_command(x, y)
+				for y in range(opts.top, opts.bottom, opts.tile_height)
+				for x in range(opts.left, opts.right, opts.tile_width)
+				]
+			))
 
 if __name__=="__main__":
 	sys.exit(main())
diff --git a/tools/darkroom/darkcult.sh b/tools/darkroom/darkcult.sh
index fcb849ac..376d1e2e 100755
--- a/tools/darkroom/darkcult.sh
+++ b/tools/darkroom/darkcult.sh
@@ -18,15 +18,21 @@ width=16
 height=16
 tile_width=16
 tile_height=16
+l=0
+t=0
+r=
+b=
+declare -a common_options=()
 declare -a user_macros=()
 declare -a include_paths=()
-max_procs=1
+max_procs=
 force=0
+continuable=0
 use_help=0
 darkcult_cpp=$(cd $(dirname $0); pwd)/darkcult.cpp
 darkcult_py=$(cd $(dirname $0); pwd)/darkcult.py
 
-args=`getopt -o s:S:o:C:w:h:W:H:D:I:P:f -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,define:,include:,max-procs:,force,help -- "$@"`
+args=`getopt -o s:S:o:C:w:h:W:H:l:t:r:b:O:D:I:P:fc -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,left:,top:,right:,bottom:,option:,define:,include:,max-procs:,force,continuable,help -- "$@"`
 if [ "$?" -ne 0 ]; then
 	echo >&2 "error: options parse error. See 'darkcult.sh --help'"
 	exit 1
@@ -42,15 +48,23 @@ while [ -n "$1" ]; do
 		-h|--height) height=$2; shift 2;;
 		-W|--tile-width) tile_width=$2; shift 2;;
 		-H|--tile-height) tile_height=$2; shift 2;;
+		-l|--left) l=$2; shift 2;;
+		-t|--top) t=$2; shift 2;;
+		-r|--right) r=$2; shift 2;;
+		-b|--bottom) b=$2; shift 2;;
+		-O|--option) common_options=(${common_options[@]} "$2"); shift 2;;
 		-D|--define) user_macros=(${user_macros[@]} "$2"); shift 2;;
 		-I|--include) include_paths=(${include_paths[@]} "$2"); shift 2;;
 		-P|--max-procs) max_procs=$2; shift 2;;
 		-f|--force) force=1; shift;;
+		-c|--continuable) continuable=1; shift;;
 		--help) use_help=1; shift;;
 		--) shift; break;;
 		*) echo >&2 "error: unknown option($1) used."; exit 1;;
 	esac
 done
+: ${r:=${width}}
+: ${b:=${height}}
 
 if [ ${use_help} -ne 0 ]; then
 	echo "help:"
@@ -79,17 +93,34 @@ if [ ${use_help} -ne 0 ]; then
 	echo "  -H, --tile-height=<value>   Output height of divided rendering."
 	echo "                              Default; 16"
 	echo ""
+	echo "  -l, --left=<value>          Left X position of rendering range."
+	echo "                              Default; 0"
+	echo ""
+	echo "  -t, --top=<value>           Top Y position of rendering range."
+	echo "                              Default; 0"
+	echo ""
+	echo "  -r, --right=<value>         Right X position of rendering range."
+	echo "                              Default; <width>"
+	echo ""
+	echo "  -b, --bottom=<value>        Bottom Y position of rendering range."
+	echo "                              Default; <height>"
+	echo ""
+	echo "  -O, --option=<opt>          Add compile option."
+	echo ""
 	echo "  -D, --define=<identifier>   Define macro for preprocessor."
 	echo ""
 	echo "  -I, --include=<dir>         Add system include path."
 	echo ""
 	echo "  -P, --max-procs=<value>     The maximum number of process use."
-	echo "                              If other than 1, processing in parallel mode."
+	echo "                              If other than null, processing in parallel mode."
 	echo "                              If 0, using the number of CPUs in the system."
-	echo "                              Default; 1"
 	echo ""
 	echo "  -f, --force                 Allow overwrite of <stagedir>."
 	echo ""
+	echo "  -c, --continuable           Enable break/continue mode."
+	echo "                              Press <Enter>; check finished."
+	echo "                              Press 'q'    ; terminate compile."
+	echo ""
 	echo "      --help                  This message."
 	exit 0
 fi
@@ -103,10 +134,15 @@ echo "  width = ${width}"
 echo "  height = ${height}"
 echo "  tile-width = ${tile_width}"
 echo "  tile-height = ${tile_height}"
+echo "  left = ${l}"
+echo "  top = ${t}"
+echo "  right = ${r}"
+echo "  bottom = ${b}"
 echo "  user-macros = (${user_macros[*]})"
 echo "  include-paths = (${include_paths[*]})"
 echo "  max-procs = ${max_procs}"
 echo "  force = ${force}"
+echo "  continuable = ${continuable}"
 
 if [ ! -f "${src}" -a ! -f "$(cd $(dirname $0); pwd)/${src}" ]; then
 	echo >&2 "error: source(${src}) not exists."
@@ -119,15 +155,18 @@ done
 for include_path in ${include_paths}; do
 	include_options="${include_options} -I${include_path}"
 done
-compile_options="-std=c++11 ${define_options} ${include_options}"
+compile_options="-std=c++11 ${define_options} ${include_options} ${common_options[*]}"
 
 if [ -d "${stagedir}" ]; then
 	if [ ${force} -eq 0 ]; then
-		echo >&2 "error: stagedir(${stagedir}) already exists."
-		exit 1
+		if [ ${continuable} -eq 0 ]; then
+			echo >&2 "error: stagedir(${stagedir}) already exists."
+			exit 1
+		fi
 	else
 		rm -f -r ${stagedir}/*
 	fi
+	rm -f ${stagedir}/*.ppm
 else
 	mkdir -p ${stagedir}
 fi
@@ -138,13 +177,13 @@ done
 echo "rendering:"
 start=${SECONDS}
 
-if [ ${max_procs} -eq 1 ]; then
-	for ((y=0; y<height; y+=tile_height)); do
+if [ -z "${max_procs}" ]; then
+	for ((y=t; y<b; y+=tile_height)); do
 		echo "  y = (${y}/${height})..."
 		y_start=${SECONDS}
 
 		echo -n "    x = "
-		for ((x=0; x<width; x+=tile_width)); do
+		for ((x=l; x<r; x+=tile_width)); do
 			echo -n "(${x}/${height})."
 			bin=${stagedir}/${y}/${x}.out
 			out=${stagedir}/${y}/${x}.ppm
@@ -158,7 +197,7 @@ if [ ${max_procs} -eq 1 ]; then
 				&& ${bin} > ${out}
 			if [ $? -ne 0 ]; then
 				echo ""
-				echo >&2 "error: compile(${y}/${x}) failed."
+				echo >&2 "  error: compile(${y}/${x}) failed."
 				exit 1
 			fi
 		done
@@ -169,16 +208,26 @@ if [ ${max_procs} -eq 1 ]; then
 	done
 else
 	echo "  processing in parallel mode."
+	if [ ${continuable} -ne 0 ]; then
+		echo "  enable break/continue mode."
+	fi
 	echo -n "  "
 	python "${darkcult_py}" \
-		"--src=${src}" "--stagedir=${stagedir}" "--output=${output}" "--compiler=${compiler}" \
+		"--source=${src}" "--stagedir=${stagedir}" "--output=${output}" "--compiler=${compiler}" \
 		"--width=${width}" "--height=${height}" \
 		"--tile_width=${tile_width}" "--tile_height=${tile_height}"" "\
+		"--left=${l}" "--top=${t}" \
+		"--right=${r}" "--bottom=${b}" \
 		"--compile_options=${compile_options}" "--darkcult_cpp=${darkcult_cpp}" \
+		"--continuable=${continuable}" "--continue_file=${stagedir}/continue.log" \
 		"--max_procs=${max_procs}"
+	result=$?
 	echo ""
-	if [ $? -ne 0 ]; then
-		echo >&2 "error: compile failed."
+	if [ ${result} -eq 2 ]; then
+		echo "  compile terminated."
+		exit 0
+	elif [ ${result} -ne 0 ]; then
+		echo >&2 "  error: compile failed."
 		exit 1
 	fi
 fi
diff --git a/tools/testspr/test.py b/tools/testspr/test.py
index c84cd34b..1162add1 100644
--- a/tools/testspr/test.py
+++ b/tools/testspr/test.py
@@ -11,26 +11,24 @@ import optparse
 import subprocess
 import multiprocessing
 
-def compile(command):
+def build(command):
 	sys.stdout.write(".")
 	sys.stdout.flush()
 	return subprocess.call(command, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
 
 def main():
 	parser = optparse.OptionParser(description='test.py')
-	parser.add_option('--stagedir', type='string')
-	parser.add_option('--gcc_version', type='string')
-	parser.add_option('--clang_version', type='string')
-	parser.add_option('--gcc_root', type='string')
-	parser.add_option('--clang_root', type='string')
-	parser.add_option('--compile_options', type='string')
+	parser.add_option('--stagedir', type='string', default='testspr')
+	parser.add_option('--gcc_version', type='string', default='.')
+	parser.add_option('--clang_version', type='string', default='.')
+	parser.add_option('--gcc_root', type='string', default='/usr/local')
+	parser.add_option('--clang_root', type='string', default='/usr/local')
+	parser.add_option('--compile_options', type='string', default='')
 	parser.add_option('--test_cpp', type='string')
-	parser.add_option('--serialized_version_specific_options', type='string')
-	parser.add_option('--max_procs', type='int')
+	parser.add_option('--serialized_version_specific_options', type='string', default='{}')
+	parser.add_option('--max_procs', type='int', default=0)
 	(opts, args) = parser.parse_args()
 
-	pool = multiprocessing.Pool(opts.max_procs if opts.max_procs != 0 else None)
-
 	def format_command(name, version, root):
 		base = "%s-%s" % (name, version) if version != "." else name
 		bin = "%s/test.%s.out" % (opts.stagedir, base.replace('.', ''))
@@ -46,8 +44,10 @@ def main():
 				opts.test_cpp, compile_log,
 				bin, execute_log
 				)
+
+	pool = multiprocessing.Pool(opts.max_procs if opts.max_procs != 0 else None)
 	return sum(result != 0 for result in pool.map(
-		compile,
+		build,
 		[format_command('gcc', version, opts.gcc_root)
 			for version in opts.gcc_version.split(' ')
 			]
diff --git a/tools/testspr/test.sh b/tools/testspr/test.sh
index 5e5053cd..74cebf65 100755
--- a/tools/testspr/test.sh
+++ b/tools/testspr/test.sh
@@ -16,7 +16,7 @@ gcc_root="/usr/local"
 clang_root="/usr/local"
 declare -a user_macros=()
 declare -a include_paths=()
-max_procs=1
+max_procs=
 force=0
 use_help=0
 declare -a common_options=()
@@ -27,7 +27,7 @@ declare -A version_specific_options=(
 test_cpp=$(cd $(dirname $0); pwd)/test.cpp
 test_py=$(cd $(dirname $0); pwd)/test.py
 
-args=`getopt -o S:g:c:O:o:D:I:P:f -l stagedir:,gcc-version:,clang-version:,gcc-root:,clang-root:,option:,version-option:,define:,include:,max-procs:,force,help -- "$@"`
+args=`getopt -o S:g:c:O:V:D:I:P:f -l stagedir:,gcc-version:,clang-version:,gcc-root:,clang-root:,option:,version-option:,define:,include:,max-procs:,force,help -- "$@"`
 if [ "$?" -ne 0 ]; then
 	echo >&2 "error: options parse error. See 'test.sh --help'"
 	exit 1
@@ -41,7 +41,7 @@ while [ -n "$1" ]; do
 		--gcc-root) gcc_root="$2"; shift 2;;
 		--clang-root) clang_root="$2"; shift 2;;
 		-O|--option) common_options=(${common_options[@]} "$2"); shift 2;;
-		-o|--version-option) version_options=(${version_options[@]} "$2"); shift 2;;
+		-V|--version-option) version_options=(${version_options[@]} "$2"); shift 2;;
 		-D|--define) user_macros=(${user_macros[@]} "$2"); shift 2;;
 		-I|--include) include_paths=(${include_paths[@]} "$2"); shift 2;;
 		-P|--max-procs) max_procs=$2; shift 2;;
@@ -74,7 +74,7 @@ if [ ${use_help} -ne 0 ]; then
 	echo ""
 	echo "  -O, --option=<opt>          Add compile option."
 	echo ""
-	echo "  -o, --version-option=<opt>  Add version specific compile option."
+	echo "  -V, --version-option=<opt>  Add version specific compile option."
 	echo "                              Example; [clang-3.3]='-ftemplate-depth=512'"
 	echo ""
 	echo "  -D, --define=<identifier>   Define macro for preprocessor."
@@ -82,9 +82,8 @@ if [ ${use_help} -ne 0 ]; then
 	echo "  -I, --include=<directory>   Add system include path."
 	echo ""
 	echo "  -P, --max-procs=<value>     The maximum number of process use."
-	echo "                              If other than 1, processing in parallel mode."
+	echo "                              If other than null, processing in parallel mode."
 	echo "                              If 0, using the number of CPUs in the system."
-	echo "                              Default; 1"
 	echo ""
 	echo "  -f, --force                 Allow overwrite of <stagedir>."
 	echo ""
@@ -162,7 +161,7 @@ compile() {
 	fi
 	return 0
 }
-if [ ${max_procs} -eq 1 ]; then
+if [ -z "${max_procs}" ]; then
 	fail_count=0
 	for version in ${gcc_version}; do
 		compile gcc ${version} ${test_cpp} ${compile_options} ${version_specific_options} ${gcc_root}