Moving sound problems

[Andrew Davison]

Dear All,

I've been unable to get a sound to fade by moving its position.
I'm using JOAL release build 1.1 b01 for Windows.
Here's a snippet of code that doesn't work:

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if (e.getSource() == playButton) {       al.alSourcePlay(source[0]);       float step = 20.0f;       float zPos = 0.0f;       for(int i=0; i < 50; i++) {         zPos += step;         float[] pos = new float[]{0, 0, zPos};         al.alSourcefv(source[0], AL.AL_POSITION, pos, 0);         try {           Thread.sleep(250);   // sleep for 0.25 secs        }         catch(InterruptedException ex) {}       }     }

Any suggestions about how to get it to work?

- Andrew

[ho]

Hi!

please check if the listener is setup correctly:

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al.alListenerfv(AL.AL_POSITION, listenerPos, 0); al.alListenerfv(AL.AL_VELOCITY, listenerVel, 0);       al.alListenerfv(AL.AL_ORIENTATION, listenerOri, 0);

try setting up the source with a distance model of you choice and make sure that all variables used by the distance formula are set correctly
look here for more information about that: http://www.openal.org/oalspecs-specs/attenuation-by-distance.html

last but not least also make sure that you are playing a MONO wav file, openal can't fade a source with Stereo data

i hope this will help you! if not please post more of the source code!
have a nice day!

greetings from austria

[Andrew Davison]

The problem was that the sound was stereo. The code works when the file was saved in mono.

A quick way of finding out on Win XP is to right click on the properties menu for the audio file, and then look at the "Summary" tab.

Thanks,
  Andrew