changes quadratic curves to cubic curves, introduces curvature factor
changes quadratic curves to cubic curves, introduces curvature factor

espinielli/globalmigration,null2/globalmigration,fxcebx/globalmigration,null2/globalmigration,espinielli/globalmigration,jb3-2/baselmigration,excelwang/globalmigration,StataBS/baselmigration,jb3-2/baselmigration,dloupia/TESTMP,fxcebx/globalmigration,excelwang/globalmigration,StataBS/baselmigration