fixed bug: performance issue when showing curvature
Merge branch 'master' of https://github.com/pan-long/Android3DVisualisationTool

Conflicts:
	app/build/intermediates/incremental/mergeAssets/debug/merger.xml
	app/build/intermediates/incremental/mergeResources/debug/merger.xml
	app/build/intermediates/libs/app-debug.ap_
	app/build/intermediates/pre-dexed/debug/support-v4-19.1.0-1188904d1c6beee77a52c512c4cd3f6b8eb48158.jar
	app/build/intermediates/res/debug/layout/activity_main.xml
	app/build/intermediates/res/debug/layout/fragment_dialog.xml
	app/build/intermediates/res/debug/layout/fragment_main.xml
	app/build/intermediates/res/debug/layout/fragment_navigation_drawer.xml
	app/build/intermediates/res/debug/menu/global.xml
	app/build/intermediates/res/debug/menu/main.xml
	app/build/intermediates/res/debug/values-w820dp-v13/values.xml
	app/build/intermediates/res/debug/values/values.xml
	app/build/outputs/apk/app-debug-unaligned.apk
	app/build/outputs/apk/app-debug.apk