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2417 discussions

camera position
by cyrille henry 14 Nov '05

14 Nov '05

hello, i just had a look at the camera object, i did not fully understand it : should it remplace the view message to gemwin, or should it be complementary? i did not find a way to set the position of the camera : i think it's really stange that it does not offer a setXYZ message, but only rotation velocity (i think accumrotate should be used when you nead to control rotation velocity). i think that this as already been discuss here, but I can't find the thread. I'm sorry to post a new mail about that, but this object look so strange to me regarding other gem objects... cyrille

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pix_snap2tex small bug
by cyrille henry 14 Nov '05

14 Nov '05

hello, there is a small bug with pix_snap2tex when destroying the Gem window see the attached patch. i noticed it with linux and windows (not tested on osX), with 0.90 and curent cvs. (any pd version) Cyrille #N canvas 887 307 763 565 10; #X msg 36 243 snap; #X obj 36 371 square 5; #X obj 36 221 t b; #X obj 124 200 gemhead -5; #X obj 36 303 color 0.8 0.8 0.8; #X obj 36 200 gemhead -15; #X obj 141 126 gemhead; #X obj 41 154 gemwin; #X msg 41 33 dimen 400 300 \, create \, 1; #X obj 141 154 sphere; #X obj 36 349 translateXYZ 0.2 0 0; #X obj 36 326 scaleXYZ 1.5 1.1 1; #X msg 62 71 destroy \, create \, 1; #X msg 199 253 400 300; #X text 225 34 <- 1 : create the window : everything work as expected ; #X text 228 279 <- 3 : ctrl-X \, ctrl-Z the pix_object : everything work again; #X obj 36 278 pix_snap2tex 0 0 400 300; #X text 225 75 <- 2 : destroy / create the window : pix_snapt2tex captur only empty (white) window; #X connect 0 0 16 0; #X connect 2 0 0 0; #X connect 3 0 16 0; #X connect 4 0 11 0; #X connect 5 0 2 0; #X connect 6 0 9 0; #X connect 8 0 7 0; #X connect 10 0 1 0; #X connect 11 0 10 0; #X connect 12 0 7 0; #X connect 13 0 16 2; #X connect 16 0 4 0;

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ortho and bollean interaction between objects
by B. Bogart 13 Nov '05

13 Nov '05

Hello all, I want to be able to see the interaction between objects in ortho mode. I have a curve3d in front of a plane. When I move the curve3d control points back I want to see the plane underneath become visible. This all works great, except I don't want the perspective to cause the edges of the curve3d to get smaller as they move from the camera. In ortho mode no matter how far back I move the control point, the place behind it never becomes visible. Any way to use ortho and still being able to keep the object interaction? The effect I'm going for is something like what water looks like as it floods a complex 3D surface, the intersection between the surface and the plane of water being the important aspects. Back _ -/-\----/\-- <- plane / A \/\/ \ <- curve3d Front Here at point "A" the plane is visible in front of the curve3d. Or let me know if you have any other ideas to accomplish this. Thanks all. b.

1 1

Video Codecs Seek performance... *sigh*
by B. Bogart 06 Nov '05

06 Nov '05

Hi all, Now that the smoke has cleared a bit from my installation in Ottawa, I'd like to ask about some performance issues with file seeking. I'm now using mpeg2 (dvd quality or so) encoded videos with single frame GOPs, and seeking them using the table of contents generated by mpeg3toc. The problem is that two 640x480 videos seeking randomly use up 80% of my new AMD64 3200+. This seems to be a bit of a hog... I also endcoded a test file as "photo-jpeg" in a quicktime container. I could also seek that file, but the CPU usage was about the same - 10%. I'm reading the files off a dual disk SATA raid0, so the disk access should not be the problem. (I can play 3 DV videos off the same array using mplayer w/out lost frames.) So the question is: #1 What is the best video codec for random seeking performance? #2 How can I profile pd/gem/diskIO/decoding to find out what is causing the largest bottleneck? Suggest tools? My previous installation used 256x256 photo-jpeg MOVs playing simultaneously on a duron 900 and gem 0.87. These videos were just played and not seeked. Thanks all! I'd really like to be able to get better performance out of this patch. .b.

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gem mingw build
by Thoralf Schulze 02 Nov '05

02 Nov '05

Hi there, I put up a mingw build of gem at http://puredata.info/Members/tfbb/gem_mingw/ . This is an almost completely untested cvs snapshot from the beginning of october. Please don't hold me resonsible if it makes your computer stink or something ... with kind regards, thoralf. ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com

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pix_image
by Tim Blechmann 01 Nov '05

01 Nov '05

hi all, since i have a gem-patch running on win32, that's displaying only this: |gemhead| | |pix_image| | |pix_texture| | |scaleXYZ 5.33 4 0| | |square| after a few days of changing the image a lot (every 10 seconds or so), it's only displaying a white screen. is this a known issue? related to the pix_image cache? thanks ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk latest mp3: kMW.mp3 http://mattin.org/mp3.html latest cd: Goh Lee Kwang & Tim Blechmann: Drone http://www.geocities.com/gohleekwangtimblechmannduo/ After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

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Maybe high-level wrappers around openGL wrappers for vector drawing? WAS Re: [Vektor] [RFC] intuitive idea
by B. Bogart 29 Oct '05

29 Oct '05

Hi Dan, Ok, this is good to here, sorry I just jumped in without seeing the whole picture. Sounds like you are also proposing soe storage format in XML for the vectors? Actually you just inspired me to think about the possibility of a collection of pd/gem abstractions for higher-level vector (2D) drawing, all based around the gem OpenGL wrappers.... Right now in Gem the only way to draw a long spline curve without a fixed number of control points is to directly use the openGL drawing function, or to use a dynamic array of two point [curve] objects. I'l looking forward to see what develops here. How do you think the proposed system could be used in other applications? .b. daniel fischer wrote: > "B. Bogart" <ben(a)ekran.org> (on Fri, 28 Oct 2005 15:01:28 -0400): > > > Anyhow its just my strong opinion that a vector engine for real-time > > graphics should simply be built on openGL and not fabricated from scratch. > > hey ben, > > thanks for your comment. > > i don't think anyone here wants to build a vector engine from scratch. that would indeed be wasted time (we already have cairo's software renderer, antigrain, gl, mesa, and maybe more). and what you mention is basically what i try to do (SVG->OpenGL). i'd just prefer to be renderer-agnostic, both because of the problems with opengl you mentioned, and because sometimes it might be preferable to take a software renderer for quality reasons. > > cairo sports a gl-backend called "glitz". but i want to go even a step further, because what i described as "the renderer's model" (well, not described, but mentioned) can be implemented using OpenGL's DisplayLists, so then unchanged objects (even sub-objects whose parents change somewhat) will stay cached on the graphics card (at least with a good GL implementation). > > so, in fact, when i will go on about writing an actual renderer, it will be using gl pretty directly. which doesnt mean there's no place in this world for antigrain or other software renderers. > > maybe i should make one thing a bit clearer: i might make some statements about the renderer's design, but really what i'm trying to find is an interface specification to it. i'd definitely love it if there are multiple concurrent renderers. > > -dan > >

1 0

pix_coordinate postrender changes
by chris clepper 25 Oct '05

25 Oct '05

Hi I commented out the two lines in the postrender method of pix_coordinate and this resolves the memory leak when using [separator] with it. I have not run into any negative side effects for this, but it did enable me to replace 12 640x480 texture uploads with 3 for a recent project. Please test the change yourselves. cgc

1 0

gemwin syntax
by Tim Blechmann 22 Oct '05

22 Oct '05

hi all, after searching the archives, i found, that the gemwin "create" message takes an argument to specify the screen. since this is not really covered in the documents, how can i specify the screen on windoze? with "create :0.1" like on linux or somehow different? thanks ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk latest mp3: kMW.mp3 http://mattin.org/mp3.html latest cd: Goh Lee Kwang & Tim Blechmann: Drone http://www.geocities.com/gohleekwangtimblechmannduo/ After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

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Re: GEM shader usage
by IOhannes m zmoelnig 21 Oct '05

21 Oct '05

Tebjan Halm wrote: > to be honest, i dont read the whole mail ... *ashamed* tststs > so if i want to use shaders, i have to compile gem together with the > shader code ? > there is no object, that can load shaders ? there are objects that load shaders (from files) you just have to compile Gem from CVS to get these objects. > ... and which shader language is supported ind gem ? currently just ARB-shaders (and in theory NVSL) so no Cg and no GLSL; i am currently thinking about how GLSL would be best integrated (which pd-object set would be nice); once i have figured that out, it should be done pretty quick. mfg.asd.r IOhannes > > greets

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