Thanks for your responce. perspec -1 640 -1 480 1 1001 did the trick. What I dont get is why I cant do perspec -1 640 -1 480 999 1001 and view 0 0 1000. The image disapears I have to have perspec at 1 1001 to see an image. Even if I do 2 1001 I get nothing. With other geos it works but not with this one I am writing. Could it be that my z depth is set at -1. I dont think that is it but maybe some one can explain that to me. Thanks, Alain
From: marius schebella marius.schebella@gmail.com Date: 2007/08/04 Sat PM 04:16:20 EDT To: nosehair911@bellsouth.net CC: pd-dev@iem.at Subject: Re: [PD-dev] smoke object help
hi, I did not follow the whole thread of this discussion, so maybe you are talking about something different, but to change the cameraposition and viewing point of the gem window send the message view (and maybe also perspec) to the gemwin object (see help patch of gemwin 'pd viewing') marius.
nosehair911@bellsouth.net wrote:
The reason I was not seeing anything was that the code was using glVertex2f and it seems that anything above -1 z depth desapears in gem. So I ended up using glVertex3f( number,number,
-1.1)
and now I can see stuff happening. Now my problem is that the action is all limited to the positive
side
of the grid. Also coordinate 500,500 is 0,0 in the gem grid and 0,0 is 2.5,2.5 on the gem grid. If anyone knows a simple way to fix this let me know. Thanks, Alain
From: nosehair911@bellsouth.net Date: 2007/08/03 Fri AM 08:47:08 EDT To: pd-dev@iem.at CC: pd-list@iem.at Subject: [PD-dev] smoke object help
Hi all,
I posted this in the gem-dev list but maybe someone here can give a some advise or a different solution for my problem. The reason I am trying to use gem is because they have already figured
out
the glLoop problem between openGL and Pd. Also because I then would have access to the
other
gem objects.
I am trying to transcribe this glut application here:
http://www.nada.kth.se/~gustavt/fluids/
into a gem object. At first at thought it would be easy seeing as the code was pretty much working but I am having a tough time of it. I compiled the original application and it works perfect but it seems like when I convert it to a gem object I get nothing.
Here are some things I am assuming, please correct me...
- glut and openGL/Gem use the same measurements like when I use glVertex2f(px,
py); it is the same in both. 2. Instead of using the glut mouse controls I can use a list inlet to get x and y coordinates.
Other than that I pretty much copied the app and used render(GemState *state) to put all of the rendering stuff into. But I still cant get it to work. I get a black screen. I think it is probably drawing somewhere of screen but I really cant seem to figure out how to fix the problem. If anyone can give me a clue I would appreciate it. Thanks, Alain
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