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From: skunkwerk <sku...@gm...> - 2008-09-02 20:28:38
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it seems as if both of the parametrization algorithms i've seen (least-squares conformal mapping and angle-based flattening) require meshes with a genus > 0 to be cut (so as to be topologically equivalent to a disc). i've read some papers on methods of doing this automatically, but haven't seen many implementations out there. is there a method in meshlab to traverse over edges and create such cuts? any suggestions on simple, non-optimal algorithms to use as a starting point? thanks, imran On Sun, Aug 24, 2008 at 9:13 AM, skunkwerk <sku...@gm...> wrote: > haha, > i'll be the first to admit i'm not the greatest programmer on the > planet. but i learn fast, and am determined enough to spend however much > time it takes. it couldn't hurt if i try to work on this, could it? > perhaps you could assign one of your students in the new term to take the > lead? > > it seems like the CGAL library has a clean interface to LSCM - you input a > mesh, and it outputs a uv pair for each vertex: > > http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Surface_mesh_parameterization/Chapter_main.html > > imran > > On Sat, Aug 23, 2008 at 5:06 PM, Paolo Cignoni <pao...@is...>wrote: > >> Dear Imran, >> >> sorry for speaking so frankly, but from many of your last emails I got the >> precise feeling that detail transfer and unwrapping are a task too hard for >> you. >> Your last email revealed that probably you still have C++ doubts at a >> basic level. >> Particularly I am referring to your last email (but others examples could >> be found) where you said: >> ... >> skunkwerk wrote: >> > I've noticed when you're random-accessing vertices, you apparently need >> to do: m.vert[f.V(c)-&(*m.vert.begin())], where f is the face and V is the >> vertex. >> > 1) I'm not quite sure while you need the m.vert.begin, as doesn't f.V() >> hold the absolute index of the vertex you want? >> > 2) And if you do need it, wouldn't you also need to do a similar thing >> for random-accessing faces too? >> > Because all I'm doing right now is: m.face[(*fit)], where fit is a face >> iterator. >> ... >> >> Teaching a CG class at the university since 1997 I think that I can say >> you that you should invest a bit more time on studying the C++ basis >> following a structured course book instead of jumping directly in the middle >> of a rather complex C++ system based on a convoluted templated library. That >> would surely shorten the time you spend in coding and debugging in C++. >> >> If you really want to contribute, spend a bit more time in testing >> debugging the whole meshlab, not only your plugin, e.g. try to find crash >> points, and writing down repeatable sequence of actions that lead in a >> deterministic way to a crash. and leave to more experienced coders the >> burden of patch it in the best way (if possible). >> That would be really a valuable contribution to the whole project. >> >> Thanks >> >> p. >> >> >> >> >> skunkwerk wrote: >> >> Paolo, >> i'd like to again request your permission to start work on the normal >> mapping/detail transfer plugin. i can continue to try and fix the last >> remaining bug with the texture atlas (when you increase its size), but I >> don't see any way to make it faster besides removing the qDebug statements >> from it... and I don't have anything else left to work on anyway :0 >> >> would the first place to start be the filter_sampling.cpp file, to add >> normals as an option to the attribute transfer? >> i've been looking at the lscm code to unwrap models... Blender seems to be >> using the superLU library as a numerical solver. I'm not sure how to >> interface with it the code at this point... >> >> thanks, >> imran >> >> 2008/7/22 Paolo Cignoni <pao...@is...> >> >>> No. >>> >>> You have to choose one of the following possibility >>> - select more than a single file in the open dialog >>> - open a mesh and then use the open as a new layer menu entry >>> - open a mesh and press the "+" button. >>> >>> http://meshlab.sourceforge.net/wiki/index.php/Layers >>> >>> >>> skunkwerk wrote: >>> >>> ah.. cool. I opened up the same model twice (so they're 2 windows now) but >>> still don't see more than one mesh option in the hausdorff distance >>> filter... am i doing something wrong? >>> >>> On Mon, Jul 21, 2008 at 10:46 PM, Paolo Cignoni <pao...@is...> <pao...@is...> >>> wrote: >>> >>> >>> >>> skunkwerk wrote: >>> >>> hey paolo, >>> i was looking at the filter_sampling plugins - both the distance and >>> 'vertex attribute transfer' plugins require 2 meshes to compare - how would >>> you get meshlab to load 2 models, such as one of the original and one of the >>> model after a filter has run on it? >>> >>> >>> Dont tell me that you have missed the whole layer mechanism... >>> it was one of the main feature of the 1.1 version... >>> http://meshlab.sourceforge.net/wiki/index.php/Release_Notes_1.1.0 >>> >>> >>> would normal mapping require adding a "normals" option to the vertex >>> attribute transfer plugin? then you'd have to bake the normals into a >>> texture, right? >>> >>> >>> >>> in a short future, >>> yes. >>> >>> imran >>> >>> 2008/6/25 Paolo Cignoni <pao...@is...> <pao...@is...> <pao...@is...> <pao...@is...>: >>> >>> >>> >>> skunkwerk wrote: >>> >>> hi Paolo, >>> i was looking at software that could do normal mapping and noticed it >>> was listed as one of the plugin projects in meshlab. >>> >>> is anyone working on it yet? anyone else interested in helping? >>> >>> I read your paper on normal mapping from a few years ago. Do I need to get >>> the texture atlas plugin fixed before starting on the detail transfer? >>> >>> yes complete the texture atlas first. >>> >>> about the redetailing stuff: it is almost in. If you look at the new >>> filter_sampling tool you can find all the basic pieces: closest retrieval >>> and texel sampling. >>> I think that adding a attribute transfer is matter of a few lines of code. >>> consider it already done. >>> (yes i have to remove it from the projecgts :) ) >>> p. >>> >>> >>> >>> imran >>> >>> ------------------------------ >>> >>> ------------------------------------------------------------------------- >>> Check out the new SourceForge.net Marketplace. >>> It's the best place to buy or sell services for >>> just about anything Open Source.http://sourceforge.net/services/buy/index.php >>> >>> ------------------------------ >>> >>> ______________________________ >>> _________________ >>> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> >>> >>> >>> >>> >>> -- >>> Paolo Cignoni -- Senior Researcher >>> Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> >>> >>> >>> >>> >>> ISTI - CNR >>> Via Moruzzi 1, >>> 56124 Pisa >>> ITALY >>> >>> >>> ------------------------------------------------------------------------- >>> Check out the new SourceForge.net Marketplace. >>> It's the best place to buy or sell services for >>> just about anything Open Source.http://sourceforge.net/services/buy/index.php >>> ______________________________ >>> _________________ >>> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> ------------------------------ >>> >>> ------------------------------------------------------------------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge >>> Build the coolest Linux based applications with Moblin SDK & win great prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the worldhttp://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> >>> ------------------------------ >>> >>> _______________________________________________ >>> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> >>> >>> >>> >>> -- >>> Paolo Cignoni -- Senior Researcher >>> Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> >>> >>> ISTI - CNR >>> Via Moruzzi 1, >>> 56124 Pisa >>> ITALY >>> >>> >>> ------------------------------------------------------------ >>> ------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> challenge >>> Build the coolest Linux based applications with Moblin SDK & win great >>> prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the worldhttp://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> _______________________________________________ >>> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> ------------------------------ >>> >>> ------------------------------------------------------------------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge >>> Build the coolest Linux based applications with Moblin SDK & win great prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the worldhttp://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> >>> ------------------------------ >>> >>> _______________________________________________ >>> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> >>> -- >>> Paolo Cignoni -- Senior Researcher >>> Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni> >>> >>> ISTI - CNR >>> Via Moruzzi 1, >>> 56124 Pisa >>> ITALY >>> >>> >>> ------------------------------------------------------------------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> challenge >>> Build the coolest Linux based applications with Moblin SDK & win great >>> prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the >>> world >>> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> _______________________________________________ >>> Meshlab-devel mailing list >>> Mes...@li... >>> https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >> ------------------------------ >> >> ------------------------------------------------------------------------- >> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge >> Build the coolest Linux based applications with Moblin SDK & win great prizes >> Grand prize is a trip for two to an Open Source event anywhere in the worldhttp://moblin-contest.org/redirect.php?banner_id=100&url=/ >> >> ------------------------------ >> >> _______________________________________________ >> Meshlab-devel mailing lis...@li...https://lists.sourceforge.net/lists/listinfo/meshlab-devel >> >> >> >> -- >> Paolo Cignoni -- Senior Researcher >> Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni> >> >> ISTI - CNR >> Via Moruzzi 1, >> 56124 Pisa >> ITALY >> >> >> ------------------------------------------------------------------------- >> This SF.Net email is sponsored by the Moblin Your Move Developer's >> challenge >> Build the coolest Linux based applications with Moblin SDK & win great >> prizes >> Grand prize is a trip for two to an Open Source event anywhere in the >> world >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> _______________________________________________ >> Meshlab-devel mailing list >> Mes...@li... >> https://lists.sourceforge.net/lists/listinfo/meshlab-devel >> >> > |
