360' rotating sound positions (openal) - comp.graphics.api.opengl

Hi cannot find any OpenAL examples/forum to help me. Now heading goes from 0 - 180 - 0 using fmod which i need for sound attenuation. Two problems with that: - same values on both sides but I need only to play sound only on one position. - initial heading not null messes things up. F.ex. 30' goes to 0 and back up to 150 etc. 180 90 car 90 0 my current code looks alike: cH is a value in degrees if (cH > 180) { headingCam = fmod(cH, 180); }else{ headingCam = 180 - fmod(cH, 180); } Many thanks Michael

On Sat, 03 Jul 2010 08:58:29 +0200 Michael <Michael@notspam.com> wrote: > Hi > cannot find any OpenAL examples/forum to help me. And this is not the OpenAL newsgroup. This is the newsgroup of the _graphics_ API "OpenGL". Despite the similar names, OpenAL is in no way directly related to OpenGL or its maintainers. Yes, it has been designed along the API concepts of OpenGL, but that's it. There are, BTW, many tutorials on the OpenAL website http://openal.org Wolfgang

On 04/07/2010 13:52, Mike wrote: > There's no active OpenAL group/forum and I cannot find any example > covering moving sources with moving listener. There appear to be some mailing lists for OpenAL. See here: http://connect.creativelabs.com/openal/default.aspx Failing which (I had trouble opening the pages), it looks like you might be able to subscribe to at least the OpenAL-Dev list here: http://old.nabble.com/mailing_list/MailingListOptions.jtp?forum=14242 Otherwise, try the alternative game libraries forum on GameDev.net: http://www.gamedev.net/community/forums/forum.asp?forum_id=61 The description says: "For discussion related to SDL, Allegro, FMod, ***OpenAL***, ODE, Ogre, CrystalSpace, etc." (emphasis mine) In any case, OpenAL isn't topical in the OpenGL newsgroup. (Just because two things sound similar doesn't make it wise to post questions on one to the newsgroup of the other. Consider e.g. gtk and ITK.) Regards, Stu

"Stuart Golodetz" <blah@blah.com> wrote in message news:EsCdnZcz6ZnYI67RnZ2dnUVZ8hSdnZ2d@pipex.net... > On 06/07/2010 08:12, Michael wrote: >> nothing new > > Oh well. Guess I can't get that twenty minutes I spent Googling to try and > help you back now... I hate it when that happens. Fuck 'em. -- Charles E Hardwidge

Am Thu, 08 Jul 2010 12:13:15 +0200 schrieb Michael <Michael@notspam.com>: > openal moving source positions seems broken... Why do you keep spamming the OpenGL (note the 'G') newsgroup with questions about OpenAL (note the 'A'). OpenGL is not related to OpenGL by bloodline. They're just named similarily. OpenGL has been developed by Silicon Graphics and is now maintained by the Khronos Group. OpenAL was developed by Creative Labs. THERE IS NO DIRECT RELATION! Please stop spamming the OpenGL newsgroup with questions about OpenAL. Wolfgang --=20 CIP-Rechnerbetriebsgruppe Fakult=C3=A4t f=C3=BCr Physik - LMU M=C3=BCnchen Schellingstrasse 4, 80799 M=C3=BCnchen

On Jul 9, 2:16=A0pm, "Wolfgang.Draxinger" <Wolfgang.Draxin...@physik.uni- muenchen.de> wrote: > > Please stop spamming the OpenGL newsgroup with questions about OpenAL. > It's not even an OpenAL question, it's a question about how to use fmod() and other very basic math.

Am Sat, 10 Jul 2010 17:53:12 +0200 schrieb Michael <Michael@notspam.com>: > Yes a general question which could be OpenGl as well. I'm even using=20 > opengl for the listener orientation but am pretty confused: > http://www.devmaster.net/forums/showthread.php?t=3D16076 Here are a few hints on how to get usefull answers, especially if it comes to programing: 1) Provide source code: If you give people a look at your code, or a minimal excerpt, which shows, how things do (not) work, it's most likely, someone will post a corrected version of the code. 2) Don't annoy the regulars: Ask questions at the proper place. For example some of the regulars of OpenGL don't deal with sound at all. They're in developing CAD software, or scientific visualization. Those people, who are likely able to give you sensible advice, even if it's outside their field, easily get annoyed and will put you on their filter lists. If someone tells you kindly, that you're in the wrong place, please heed that advice. If you can't find the place you're looking for, don't come back whining. 3) Google is your friend. 4) Before asking questions, which may put you to shame later, try finding some existing examples about how to solve the problem you have, or similar problems. Play around with those examples, make change to their code. 5) Google is your friend. 6) If your problem is related to math make sure, you've probably understood the mathematical properties of the problem. Double check that you made no mistake. 7) Don't reinstanciate the questions if you don't like the reply. Also don't accuse the regulars to be unwilling to help, if you violated 2). Now to get you in the right direction: *1) you didn't do that. Can't help you there, I don't have a crystal orb, and AFAIK those of the other regulars are broken. *2) I mentioned that point, nuff said. *3) http://lmgtfy.com/?q=3Dopengl+openal+example *4) see *3) *5) see *4) *6) Angles go from 0=C2=B0|0 to 360=C2=B0|2pi. If you want to place your pi= vot somewhere else you may apply a phase shift. A heading going from 0 to 180 back to 0 makes no sense at all. -180 to 0 to +180, that would make sense. Or 0 to +180, then a discontinouity to -180=C2=B0 and from there back to 0=C2=B0. Note that all nonhyperbolic trigonometric functions are inherently modular. Because of that you should not clamp input values for those during development, as this may conceal bugs. Later on you may add modulo 360=C2=B0|2pi operations to keep values in range. Your application of modulo 180=C2=B0|pi is just wrong. *7) see *2) BTW OpenAL ships with a nice demo of how to use OpenAL together with OpenGL. Also you should keep in mind that OpenAL sound sources behave like light sources in OpenGL. Wolfgang

Ich k=F6nnte das doch in OpenGL machen? So etwa: glPushMatrix(); glLoadIdentity(); glTranslatef(localX/10, localY/10, localZ/10); glRotatef (-psi, 0.0,1.0,0.0); glRotatef (-pTheta,-1.0,0.0,0.0); glRotatef (-pPhi, 0.0,0.0,1.0); glPopMatrix(); Wie kann ich denn nun die neuen Werte =FCbernehmen? alSourcefv(Sources[1], AL_POSITION, Sour... Danke

I could do that in OpenGL? alike: glPushMatrix(); glLoadIdentity(); glTranslatef(localX/10, localY/10, localZ/10); glRotatef (-psi, 0.0,1.0,0.0); glRotatef (-pTheta,-1.0,0.0,0.0); glRotatef (-pPhi, 0.0,0.0,1.0); glPopMatrix(); But how to use the new values? alSourcefv(Sources[1], AL_POSITION, Sour... Thanks

On Sun, 11 Jul 2010 04:31:37 -0700 (PDT) Mike <michael.sgier@gmail.com> wrote: > I could do that in OpenGL? alike: > glPushMatrix(); > glLoadIdentity(); > glTranslatef(localX/10, localY/10, localZ/10); > glRotatef (-psi, 0.0,1.0,0.0); > glRotatef (-pTheta,-1.0,0.0,0.0); > glRotatef (-pPhi, 0.0,0.0,1.0); > glPopMatrix(); > > But how to use the new values? > alSourcefv(Sources[1], AL_POSITION, IMHO one of the biggest fallacies of the OpenAL API is, that it allows to set listener vectors. Just keep the listener in the origin, looking into negative Z direction, with 0 velocity. Just transform the sound sources around. Positions transform by your OpenGL modelview matrix (just like vertex positions), velocity vectors beave like normals, so these must be transformed by the inverse transpose of the modelview matrix. Then just subtract the listener velocity vector from the transformed source velocities. Then use these values for the sound sources. Wolfgang

So why is this not working? -------- glPushMatrix(); glLoadIdentity(); glTranslatef(lX/10, lY/10, lZ/10); glRotatef (-pPsi, 0.0,1.0,0.0); glRotatef (-pTheta,-1.0,0.0,0.0); glRotatef (-pPhi, 0.0,0.0,1.0); alSource3f(Sources[1], AL_POSITION, lX/10, lY/10, lZ/ 10); glPopMatrix(); ------- Thanks

On Mon, 12 Jul 2010 01:54:53 -0700 (PDT) Mike <michael.sgier@gmail.com> wrote: > So why is this not working? > -------- > glPushMatrix(); > glLoadIdentity(); > glTranslatef(lX/10, lY/10, lZ/10); > glRotatef (-pPsi, 0.0,1.0,0.0); > glRotatef (-pTheta,-1.0,0.0,0.0); > glRotatef (-pPhi, 0.0,0.0,1.0); > > alSource3f(Sources[1], AL_POSITION, lX/10, > lY/10, lZ/ 10); > glPopMatrix(); > ------- > Thanks For the same reason, OpenAL questions don't belong here: OpenAL does not interact with OpenGL, period. Wolfgang

On Tue, 13 Jul 2010 07:45:12 +0200 Michael <Michael@notspam.com> wrote: > jerk Excuse me?! Do you realize, that all the other regulars probably had put you in their filters quite early on. That was the 5th attempt, I trying to make you realize, that you're barking up the wrong tree. I told you in my very first reply, that OpenAL and OpenGL are not related. Why on earth did you come to think then, that by putting an OpenAL call between OpenGL calls, OpenAL will be influenced by OpenGL? THERE'S NO RELATIONSHIP BETWEEN THEM! THERE'S NO INTERACTION BETWEEN THEM! And I already told you, how to use them in a program, so that the output of both is consistent. Wolfgang

Wolfgang Draxinger wrote: > On Tue, 13 Jul 2010 07:45:12 +0200 > Michael <Michael@notspam.com> wrote: > >> jerk > > Excuse me?! > > Do you realize, that all the other regulars probably had put you in > their filters quite early on. That was the 5th attempt, I trying to > make you realize, that you're barking up the wrong tree. I haven't, because I always expect some fun. btw replying seams pointless (as this thread shows) :)

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