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From: Paolo C. <pao...@is...> - 2008-05-08 07:36:10
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fit->cWT(0).N() the small c before WT means that you are asking for a constant access so you can read the values inside WT but you cannot change them. you should use something like fit->WT(0).N() obviously assuming that fit is not a constfaceiterator. We are building up some tutorial on the vcg foundations you can find a first draft at http://vcg.sourceforge.net/mediawiki/index.php/Tutorial p. skunkwerk wrote: > thanks paolo, > any hints on why i can't modify faces with the iterator i'm using? > am i using the wrong kind? i saw 'constfaceiterator' in the code > somewhere, so I figured 'faceiterator' wouldn't be const. > > imran > > On Wed, May 7, 2008 at 3:44 PM, Paolo Cignoni > <pao...@is... <mailto:pao...@is...>> wrote: > > Translated. sorry for the italian comments that are surviving in a > lot of places... > > > > skunkwerk wrote: >> i'm using a CMesh0::FaceIterator but it seems like it's a const >> for some reason - when I try to change values of the face, like >> fit->cWT(0).N() i get compilation errors about 'assignment of >> read-only location.' what's the proper way to modify these values? >> >> i was translating some of the italian comments in rect_packer.cpp >> but couldn't find translations for the following: >> posiziono - position? >> pe plus' >> could someone please translate these to english for me? >> >> thanks >> imran >> >> On Tue, Apr 29, 2008 at 11:48 PM, skunkwerk <sku...@gm... >> <mailto:sku...@gm...>> wrote: >> >> thanks Paolo, >> i guess CMesh0 is how i'll get the faceiterator - i'm >> working on some collada importer optimizations right now but >> might get back to this in a few days. what options do we >> have for a numerical solver? >> >> imran >> >> >> On Tue, Apr 29, 2008 at 2:22 PM, Paolo Cignoni >> <pao...@is... >> <mailto:pao...@is...>> wrote: >> >> I like your proposal, but I strongly suggest you to >> proceed gradually and start and complete and test a >> functionality at a time. >> >> First of all start to just add a simple rectangular packer, >> >> - then try to use the rect_packer provided code >> >> - then try to look at the code in the >> trimesh/textcoord_optimization.h file. >> >> Before facing LSCM we should solve the issue of what >> numerical solver use for it and for other issues that we >> have around in the vcg. >> I hope we could take some decision in the next weeks >> about the numeric solver in the vcg. >> >> I noticed that some notes on the basic types were missing >> so i added it in >> http://meshlab.sourceforge.net/wiki/index.php/Writing_a_Plugin >> Feel also free to contribute to the wiki in the part >> about the writing of the plugins when you see points >> needing some clarification or a deeper discussion. >> >> >> cheers >> p. >> >> >> >> >> >> >> >> skunkwerk wrote: >>> thanks for the hints paolo, >>> i wanted to use this algorithm: >>> http://alice.loria.fr/php/article.php?pub=../publications/papers/2002/lscm >>> but it seemed like it needed information on the actual >>> models, and was taking in arbitrarily-shaped textures. >>> >>> the only other algorithm i've found for texture packing >>> is a recursive tree-based one: >>> http://www.blackpawn.com/texts/lightmaps/default.html >>> >>> i tried this line (along with everything else i could >>> think of): >>> MeshModel::FaceIterator fit; >>> but it didn't like the 'MeshModel' part - is 'mm' not an >>> object of type MeshModel? >>> >>> if someone could suggest the correct syntax i can get >>> started on testing the texture atlas >>> >>> thanks, >>> imran >>> >>> On Tue, Apr 29, 2008 at 2:13 AM, Paolo Cignoni >>> <pao...@is... >>> <mailto:pao...@is...>> wrote: >>> >>> skunkwerk wrote: >>> > i've attached a texture atlas function. >>> > >>> > it compiles except for a ConstFaceIterator error - >>> I've tried using >>> > the template<typename MESHTYPE> but that didn't >>> work either. the >>> > algorithm is VERY basic (textures are added one >>> after another in a >>> > row), but should work. i couldn't find any >>> algorithms for more >>> > closely-packed positioning, but i could look at >>> the code in >>> > openscenegraph's texture atlas generator. >>> Nice Job! >>> >>> The right place for this stuff is the filter_texture >>> plugin that i have >>> just added, >>> Now it is just a placeholder filter you should add >>> your code there. >>> >>> Important: >>> In the plugin dir you can find a rect_packer that >>> should make good job. >>> please use it to build a good packing of the texture >>> size >>> >>> > questions: >>> > 1) if someone could tell me how to iterate >>> through faces from a >>> > function outside vcg, that'd be great so i could >>> test this out >>> We have started to improve the developer >>> documentation: two new pages in >>> the wiki should help you >>> >>> http://meshlab.sourceforge.net/wiki/index.php/Accessing_the_mesh >>> http://meshlab.sourceforge.net/wiki/index.php/Algorithms >>> >>> > 2) paolo, what's the best location of this >>> function? i'm currently >>> > putting it in mainwindow_Runtime.cpp to test it out >>> The right location is inside the filter_texture plugin >>> possible parameter of the plugin: >>> - format of the saved texture (as a enum) >>> - max size of the texture >>> >>> > 3) how do I access the data from already-loaded >>> textures? so i can >>> > prevent having to load all the textures again... >>> Do not worry about that. Feel free to use QT to load >>> again the images >>> and process them, it should not create a significant >>> overhead. >>> >>> Once your processing is ended (and you have saved >>> the new texture) you >>> should update the texture names stored inside the >>> mesh sending a signal >>> to the updateTexture() slot of the mainwindow (the >>> parent of the action) >>> >>> cheers >>> p. >>> >>> -- >>> 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 2008 >>> JavaOne(SM) Conference >>> Don't miss this year's exciting event. There's still >>> time to save $100. >>> Use priority code J8TL2D2. >>> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >>> _______________________________________________ >>> Meshlab-devel mailing list >>> Mes...@li... >>> <mailto:Mes...@li...> >>> https://lists.sourceforge.net/lists/listinfo/meshlab-devel >>> >>> >>> ------------------------------------------------------------------------ >>> ------------------------------------------------------------------------- >>> This SF.net email is sponsored by the 2008 JavaOne(SM) >>> Conference Don't miss this year's exciting event. >>> There's still time to save $100. Use priority code >>> J8TL2D2. >>> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >>> >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> Meshlab-devel mailing list >>> Mes...@li... <mailto:Mes...@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 2008 JavaOne(SM) >> Conference >> Don't miss this year's exciting event. There's still time >> to save $100. >> Use priority code J8TL2D2. >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> _______________________________________________ >> Meshlab-devel mailing list >> Mes...@li... >> <mailto:Mes...@li...> >> https://lists.sourceforge.net/lists/listinfo/meshlab-devel >> >> >> >> ------------------------------------------------------------------------ >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> Don't miss this year's exciting event. There's still time to save $100. >> Use priority code J8TL2D2. >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Meshlab-devel mailing list >> Mes...@li... <mailto:Mes...@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 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save > $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Meshlab-devel mailing list > Mes...@li... > <mailto:Mes...@li...> > https://lists.sourceforge.net/lists/listinfo/meshlab-devel > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > > ------------------------------------------------------------------------ > > _______________________________________________ > Meshlab-devel mailing list > Mes...@li... > https://lists.sourceforge.net/lists/listinfo/meshlab-devel > -- Paolo Cignoni -- Senior Researcher Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni ISTI - CNR Via Moruzzi 1, 56124 Pisa ITALY |
