On Wed, 24 Mar 2010 11:56:50 +0100 Xavier Cremaschi <omega.xav...@gmail.com> said:
> Le 24/03/2010 01:22, Carsten Haitzler (The Rasterman) a écrit : > > On Mon, 22 Mar 2010 10:00:56 +0100 > > Xavier Cremaschi<omega.xav...@gmail.com>said: > > > >> EFL can use opengl for its rendering (not on openmoko, because it seems > >> we don't have an opengl-es driver). What do you mean by 3d ? Can I > >> modelize cube, sphere, and do some projective geometry ? > >> > >> In elementary I cannot find an equivalent of an opengl context > >> (QGLWidget in qt4), if someone has an idea ? > >> > > see evas_map stuff - u can apply a "map" (a (texture)map). you define 4 > > points in space (3d), 4 texture u,v co-ordinates (that map the given object > > geometry to these 4 points - just like opengl). you cat rotate these points > > around the 3 axes (x, y and z) by number of degrees and you now can apply > > a perspective transform + lighting to this map (the 4 points). see expedite > > or elementary - they use this. the elm flip widget does just this to flip > > in "3d" between a front and back side of a "card". expedite crates its > > spinning cubes this way. > > > > it's not intended for full "3d" - like making complex 3d apps/games. it's > > meant for 3d effects in 2d ui's. like spinning, rotating and flipping. it > > can be used a bit more extensively to do single geometric stuff like cubes > > - it could do spheres given enough faces made out of multiple objects, but > > that's pushing it. it could do simple 3d needed for things like > > mapping/navigation apps. > > > > but no - there is no "qglwidget" thing in evas - this imho is "throwing in > > the towel" and just "do it all in opengl" which is a very different api > > concept to evas - it means you NEEED opengl or it just doesnt work. evas > > provides its map feature with or without opengl present. it works (fast) in > > software as well as opengl. it's an always-on and always-working feature. > > > > > > Thanks for you answer. > > I just need to modelize simple dices I think (d4,6,8,10,12,20... I could > see later to add the exotic ones), so if I understand what you wrote and > how evas_map works, I need to : > - use many evas_map to describe a dice (evas_map being 4 points, it's > easy for d4...for d6 with 8 vertexes I could use 2 maps) > - use available rotate functions (and own translate functions) to > animate that > > For a d4, something like : > - Evas_Map *m = evas_map_new(4); > - I give my four 3d points, using evas_map_point_coord_set(..) > - I do myself a projection to determine where these points are in the 2d > texture (if I want a top view for example) > - I set these four 2d points with evas_map_point_image_uv_set(..) > - Now I can use rotate/translate to move the dice > ? look at expedite and its cubes - u dont need to do the projection etc. evas has these for you - move your stuff in 2d space as u please (the 4 point x, y coords) and set z as u like. u can use the map util funcs to rotate around any point/axis. you can use the perspective call to do the "projection" (if you want 3d perspective) and lighting too. if you want. with a point lightsource. when done u set the map for the obj (well enable it too). you can free it now as the obj has its own copy of that map - u want to make a new one and modify it for the next frame/change -- ------------- Codito, ergo sum - "I code, therefore I am" -------------- The Rasterman (Carsten Haitzler) ras...@rasterman.com _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
