feature extraction in point cloud there is a file called readme,you can see it to help you understand

Filename	Size	Update
Alpha_shapes_3	0	2011-10-27
Alpha_shapes_3\Alpha_shapes_3.ncb	6974464	2011-11-01
Alpha_shapes_3\Alpha_shapes_3.sln	1874	2011-10-27
Alpha_shapes_3\Alpha_shapes_3.sln.old	586	2007-08-26
Alpha_shapes_3\Alpha_shapes_3.suo	10752	2011-11-01
Alpha_shapes_3\README	612	2007-08-26
Alpha_shapes_3\UpgradeLog.XML	8796	2011-10-27
Alpha_shapes_3\VC	0	2011-10-27
Alpha_shapes_3\VC\Debug	0	2011-10-27
Alpha_shapes_3\VC\Debug\alpha_shapes_3	0	2011-10-27
Alpha_shapes_3\VC\Debug\alpha_shapes_3\BuildLog.htm	11234	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\alpha_shapes_3.exe.embed.manifest	403	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\alpha_shapes_3.exe.embed.manifest.res	468	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\alpha_shapes_3.exe.intermediate.manifest	385	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\alpha_shapes_3.obj	6811373	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\mt.dep	67	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\vc80.idb	912384	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3\vc80.pdb	1667072	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3.exe	598016	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3.ilk	2121152	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_3.pdb	6966272	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3	0	2011-10-27
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\BuildLog.htm	12792	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\alpha_shapes_with_hierarchy_3.exe.embed.manifest	403	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\alpha_shapes_with_hierarchy_3.exe.embed.manifest.res	468	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\alpha_shapes_with_hierarchy_3.exe.intermediate.manifest	385	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\alpha_shapes_with_hierarchy_3.obj	5517416	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\mt.dep	67	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\vc80.idb	920576	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3\vc80.pdb	1658880	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3.exe	487424	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3.ilk	2055412	2011-10-28
Alpha_shapes_3\VC\Debug\alpha_shapes_with_hierarchy_3.pdb	6753280	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3	0	2011-10-27
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\BuildLog.htm	12152	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\mt.dep	67	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\vc80.idb	904192	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\vc80.pdb	2347008	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\weighted_alpha_shapes_3.exe.embed.manifest	403	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\weighted_alpha_shapes_3.exe.embed.manifest.res	468	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\weighted_alpha_shapes_3.exe.intermediate.manifest	385	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3\weighted_alpha_shapes_3.obj	13316599	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3.exe	638976	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3.ilk	3649524	2011-10-28
Alpha_shapes_3\VC\Debug\weighted_alpha_shapes_3.pdb	13765632	2011-10-28
Alpha_shapes_3\VC\Debug\新建 文本文档.bat	27	2011-10-28
Alpha_shapes_3\VC\alpha_shapes_3.vcproj	5089	2011-10-27
Alpha_shapes_3\VC\alpha_shapes_3.vcproj.19086DDB22E94B5.Administrator.user	1433	2011-11-01
Alpha_shapes_3\VC\alpha_shapes_3.vcproj.7.10.old	4316	2007-08-26
Alpha_shapes_3\VC\alpha_shapes_with_hierarchy_3.vcproj	5149	2011-10-27
Alpha_shapes_3\VC\alpha_shapes_with_hierarchy_3.vcproj.19086DDB22E94B5.Administrator.user	1433	2011-11-01
Alpha_shapes_3\VC\alpha_shapes_with_hierarchy_3.vcproj.7.10.old	4376	2007-08-26
Alpha_shapes_3\VC\weighted_alpha_shapes_3.vcproj	5125	2011-10-27
Alpha_shapes_3\VC\weighted_alpha_shapes_3.vcproj.19086DDB22E94B5.Administrator.user	1433	2011-11-01
Alpha_shapes_3\VC\weighted_alpha_shapes_3.vcproj.7.10.old	4352	2007-08-26
Alpha_shapes_3\_UpgradeReport_Files	0	2011-10-27
Alpha_shapes_3\_UpgradeReport_Files\UpgradeReport.css	3348	2011-10-27
Alpha_shapes_3\_UpgradeReport_Files\UpgradeReport.xslt	12218	2005-12-13
Alpha_shapes_3\_UpgradeReport_Files\UpgradeReport_Minus.gif	69	2011-10-27
Alpha_shapes_3\_UpgradeReport_Files\UpgradeReport_Plus.gif	71	2011-10-27
Alpha_shapes_3\alpha_shapes_3.cpp	1345	2007-08-26
Alpha_shapes_3\alpha_shapes_with_hierarchy_3.cpp	1776	2007-08-26
Alpha_shapes_3\data	0	2011-10-27
Alpha_shapes_3\data\bunny_1000	30723	2007-08-26
Alpha_shapes_3\data\fin	30723	2007-08-26
Alpha_shapes_3\makefile	2336	2007-08-26
Alpha_shapes_3\weighted_alpha_shapes_3.cpp	2259	2007-08-26

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