You are wondering why a 1:1 perspective works for a 4:3 window?
On 5/13/07, cyrille henry <[EMAIL PROTECTED]> wrote:
could you also try the test3 patch i just send? thanks Cyrille chris clepper a écrit : > Your example patch works exactly as it should on OSX. > > On 5/13/07, altern <[EMAIL PROTECTED]> wrote: >> >> cyrille henry(e)k dio: >> > hello, >> > >> > altern a écrit : >> >> hi >> >> >> >> do you mean something like the example attached? >> > yes, exactly. >> > >> >> This doesnt work ok for me, the shape should be 10x10 px and is not, >> > a [rectangle 10 10] should be 20 pixel. >> >> i understand from the rectangle help that [rectangle 10 10] should be a >> 10 units width by 10 units height square. I get a rectangle which is >> irregular, check the attached screnshot gif >> >> >> also x and y pos are dont match with window size. Translating to 400, >> >> 300 should place the rect in top right corner but I get that with only >> >> 320, 190, so the units are not mapped to pixels >> > translating to 400 300 should move the center of the rectangle in the >> > top right corner. >> > if your rectangle is 100 100, then you just have to move it 300 200 in >> > order to have the corner of the rectangle in the corner of the gem >> window. >> > >> > your patch work that way here. >> >> check the attachment again, the rect is 10x10 and it is located at >> X=307, Y=167. This should be far from 400, 300 which should be the >> top,right location. So the coordinate system is distorted, specially on >> the y axis >> >> I also tried with >> dimen 400 400 >> perspec 0 400 0 400 999 1001 >> If draw a 1 by 1 rect and i get it to the right top corner by >> translating it 320, 320. So pixels are dont match gl units and moreover >> in the previous example when the gem window is not a square the >> distortion affects differently the X and the Y axis >> >> >> >> >> but maybe i am missing something from what you describe? >> >> >> >> In opengl to achieve this 2D like-pixels to units effect i would >> >> set the perspective to be orthographical with glOrtho command, is >> >> something like this possible in Gem? >> > yes, insert an [ortho] after the gemhead >> > >> > >> > cyrille >> > >> >> >> >> thanks!! >> >> >> >> enrike >> >> >> >> cyrille henry(e)k dio: >> >>> hello, >> >>> >> >>> i tried with : >> >>> dimen 400 300 >> >>> view 0 0 1000 // 1000 is in order to put the camera far from the view >> >>> point, to reduce space distortion >> >>> perspec 0 400 0 300 999 1001 // 999 and 1001 limit the render to >> >>> primitive position is between -1 and 1 (because camera is at 1000) >> >>> >> >>> >> >>> and everything is working as expected. >> >>> i just have 1 strange thing : i need to set the [dimen<, [create< , >> >>> then [reset< and last [view< and [perspec< if i did not do a reset, a >> >>> square is not rendered as a square but a rectangle. >> >>> >> >>> anyway, it's working. >> >>> >> >>> cyrille >> >>> >> >>> >> >>> altern a écrit : >> >>>> i tried to pass different view values to gemwin. I can see that in >> >>>> order to be able to specify location or with with pixels i should >> >>>> set view to >> >>>> view 0 0 2 >> >>>> but as soon as i set that the shape is not there any more. This is >> >>>> an example i am using to test. If i ser view to >> >>>> view 0 0 2.01 >> >>>> it is almost there but if i set it to 0 0 2 it is not there any >> >>>> more. I guess it might be because it is either beyond the back limit >> >>>> y or behind the camera? >> >>>> >> >>>> thanks >> >>>> >> >>>> enrike >> >>>> >> >>>> >> >>>> altern(e)k dio: >> >>>>> hi >> >>>>> >> >>>>> I am trying to map GEM units to pixels so that i can position some >> >>>>> videos in the GEM window using pixels values. For this I understand >> >>>>> that >> >>>>> i must match the projection values with the window size. So i am >> doing >> >>>>> >> >>>>> dimen 400 300 >> >>>>> perspect 0 400 0 300 1 20 >> >>>>> >> >>>>> and i render all objects at z position 1 >> >>>>> >> >>>>> translateXYZ 100 100 1 >> >>>>> >> >>>>> However I am getting a weird result, the units are far smaller that >> >>>>> pixels, so to move a video 100px in the x i need to change it x >> >>>>> position >> >>>>> by 300 units or something like this. So I am not sure about what i >> am >> >>>>> doing wrong, I am familiar with OpenGL but i never played too much >> >>>>> with >> >>>>> GEM before so I am still getting into it. >> >>>>> >> >>>>> Another small issue is that I would also like to reverse the Y so >> that >> >>>>> upper left is 0,0 and bottom left would be 0,200 for example, not >> sure >> >>>>> about how to change this. I guess it is to do with the gemwin >> settings >> >>>>> but i dont get it right. >> >>>>> >> >>>>> thanks >> >>>>> >> >>>>> enrike >> >>>>> >> >>>>> >> >>>> >> >>>> >> >>>> _______________________________________________ >> >>>> [email protected] mailing list >> >>>> UNSUBSCRIBE and account-management -> >> >>>> http://lists.puredata.info/listinfo/pd-list >> >>>> >> >>>> >> >>> >> >> >> >> >> >> >> >> >> ------------------------------------------------------------------------ >> >> >> >> #N canvas 393 156 429 320 10; >> >> #X obj 84 210 gemwin; >> >> #X obj 245 163 gemhead; >> >> #X msg 173 82 create \, 1; >> >> #X msg 293 106 0 \, destroy; >> >> #X floatatom 309 164 5 0 0 0 - - -; >> >> #X floatatom 347 164 5 0 0 0 - - -; >> >> #X floatatom 288 215 5 0 0 0 - - -; >> >> #X floatatom 332 215 5 0 0 0 - - -; >> >> #X obj 245 190 translateXYZ 10 10 1; >> >> #X msg 215 50 dimen 400 300; >> >> #X msg 48 73 view 0 0 1000; >> >> #X msg 9 48 perspec 0 400 0 300 999 1001; >> >> #X msg 110 99 reset; >> >> #X obj 50 -8 bng 15 250 50 0 empty empty empty 0 -6 0 10 -262144 -1 >> >> -1; >> >> #X obj 50 13 t b b b b b; >> >> #X obj 245 234 rectangle 10 10; >> >> #X connect 1 0 8 0; >> >> #X connect 2 0 0 0; >> >> #X connect 3 0 0 0; >> >> #X connect 4 0 8 1; >> >> #X connect 5 0 8 2; >> >> #X connect 6 0 15 1; >> >> #X connect 7 0 15 2; >> >> #X connect 8 0 15 0; >> >> #X connect 9 0 0 0; >> >> #X connect 10 0 0 0; >> >> #X connect 11 0 0 0; >> >> #X connect 12 0 0 0; >> >> #X connect 13 0 14 0; >> >> #X connect 14 0 11 0; >> >> #X connect 14 1 10 0; >> >> #X connect 14 2 12 0; >> >> #X connect 14 3 2 0; >> >> #X connect 14 4 9 0; >> >> >> > >> >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> >> >
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