http://www.opengl.org/discussion_boards/ubbthreads.php OpenGL Discussion All Forums OpenGL.org Discussion and Help Forums - UBB.threads(tm) http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274396#Post274396 Posted by mtnbiker:
Hello, I am currently taking an opengl class and have hit a wall with my texture coordinates. I am attempting to have my texture drawn onto a vehicle made up of triangles but no matter what combination of coordinates I use there is always unwanted stretch]]> Fri, 19 Mar 2010 21:22:17 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274386#Post274386 Posted by Stephen A:
[quote][source]#define offsetof(st, m) ((size_t) ( (char *)&((st *)(0))->m - (char *)0 ))[/source][/quote] Wrong programming language, this looks like C# w/ Tao Framework. :) The offsets are indeed wrong, fix them and you should see something on scr]]> Fri, 19 Mar 2010 17:16:53 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274383#Post274383 Posted by revg75:
Hi Guys, I am creating software that will take in building dimensions and properties from a database and create a 3D preview of the building in opengl. I know that I will need to put windows in the walls in arbitrary locations on a polygon which I a]]> Fri, 19 Mar 2010 16:38:48 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274381#Post274381 Posted by Dark Photon:
[quote=nickels]I want to dispatch my lighting info (for several lights) to the shader program, but it seems wasteful to do this over and over. How to send the data to the gpu once and then access it from the same shader on multiple calls and/or multipl]]> Fri, 19 Mar 2010 16:25:43 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274379#Post274379 Posted by Alfonse Reinheart:
No.]]> Fri, 19 Mar 2010 15:56:17 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274371#Post274371 Posted by MUFTI:
It looks like, there is a memory error in the tess.c redbook example on the www.opengl.org: [url=http://www.opengl.org/resources/code/samples/redbook/tess.c]http://www.opengl.org/resources/code/samples/redbook/tess.c[/url] vertex = (GLdouble *)]]> Fri, 19 Mar 2010 13:54:44 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274370#Post274370 Posted by Ehsan Kamrani:
1)If your OpenGL implementation supports ARB_texture_non_power_of_two then you can load and render non power of 2 textures. 2)You bind the texture before drawing the plane object. If you rotate your plane, your texture coordinate are also rotated--So the]]> Fri, 19 Mar 2010 13:51:42 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274362#Post274362 Posted by YarUnderoaker:
Strange, but I do not get any errors, although the objects draw by Begin/End. Okay I'll have to write shaders that would draw a scene :( PS: a result of CUDA kernel is integer texture to. But I render it with shader. [quote]#version 150 uniform usample]]> Fri, 19 Mar 2010 12:29:06 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274356#Post274356 Posted by mycral:
OpenGL super bible ]]> Fri, 19 Mar 2010 11:30:02 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274351#Post274351 Posted by V-man:
The non ARB version of functions are core functions. So, the right GL version must be supported by the driver. You can check that with glGetString(GL_VERSION). Yes, Using ARB or even EXT version gives more compatibility specially if you want to support]]> Fri, 19 Mar 2010 09:39:45 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274350#Post274350 Posted by Dark Photon:
[quote=bytebucket]I have an app which has used only orthographic projection up to this point. I'd like to add, as an option, perspective projection. ... [code]glOrtho(gLeft, gRight, gBottom, gTop, -gNear, -gFar)[/code] A simple replacement of this with]]> Fri, 19 Mar 2010 09:35:34 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274349#Post274349 Posted by gephi:
Hi all, [url=http://gephi.org]Gephi[/url] organization, open-source graph visualization plaform is looking for students application about a Shader-based visualization engine. You may already know how Google SoC works, basically a student will receiv]]> Fri, 19 Mar 2010 08:56:46 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274329#Post274329 Posted by Ilian Dinev:
Display-lists (old), VBOs (recommended)]]> Thu, 18 Mar 2010 23:38:22 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274324#Post274324 Posted by James A.:
yes, or p+N, if your Normal is normalized. In which case it will give you a second point of distance 1 away from your first point P.]]> Thu, 18 Mar 2010 22:53:45 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274322#Post274322 Posted by ZbuffeR:
I think I found something : [code] fread(&p,1,1,fp); b = p/255; fread(&p,1,1,fp); g = p/255; fread(&p,1,1,fp); r = p/255; glColor3f(r,g,b); [/code] 1) p/255 is an integer division in C. That mean either 0 or 1 as a result ... 2) instead, you ]]> Thu, 18 Mar 2010 21:37:49 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274297#Post274297 Posted by sidesprang:
never mind. found the error. copy pasted wrong function :P]]> Thu, 18 Mar 2010 17:04:58 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274284#Post274284 Posted by Rob A:
The driver download page says that the newly released drivers support GeForce 8000 and up, but when I attempt to update from my previous driver it says the device isn't supported. I have a GeForce 8600M GT, 32-bit XP SP3. Is this not going to work? ]]> Thu, 18 Mar 2010 15:29:52 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274283#Post274283 Posted by beginnertom:
+_+]]> Thu, 18 Mar 2010 15:27:21 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274276#Post274276 Posted by Rosario Leonardi:
you have first need to fill the buffer with your data. You can use one buffer object for each attribute or a single buffer object for every attribute. This tutorial should be ok. http://www.songho.ca/opengl/gl_vbo.html Then your code is almost ok. ]]> Thu, 18 Mar 2010 13:15:50 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274269#Post274269 Posted by Jan:
Alfonse just formulated exactly my thoughts.]]> Thu, 18 Mar 2010 12:00:24 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274264#Post274264 Posted by Bruce Wheaton:
Looks like switch was added in GLSL 1.3, which isn't on Mac, as you say. I can do if/else no problem. I can only presume Nvidia's compiler is smart enough to optimize that the same as a switch, since I'm sure a lot of code hasn't moved to the newer syn]]> Thu, 18 Mar 2010 11:32:58 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274263#Post274263 Posted by Ehsan Kamrani:
You object is simply at the same position defined with [code]glLightfv(GL_LIGHT0 + i, GL_POSITION, m_lightPos );[/code] [code]glDisable( GL_LIGHTING ); glPushMatrix(); glTranslatefv( lightPos ); //Draw your preferred shape for the light source ]]> Thu, 18 Mar 2010 11:21:38 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274262#Post274262 Posted by Mukund:
Yeah that was kinda what i was looking for..I got an idea as to how i can proceed now.. Thanks for your help.]]> Thu, 18 Mar 2010 10:46:44 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274261#Post274261 Posted by aqnuep:
There can be rounding errors in case of the normalized texture coordinates (due to the normalization process) but those should not produce any visual artifacts if you use NEAREST filtering.]]> Thu, 18 Mar 2010 10:42:08 CDT http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=274259#Post274259 Posted by JRGlide:
OK, Thank you.]]> Thu, 18 Mar 2010 10:22:11 CDT