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engine sounds question

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engine sounds question

Postby glazmax » Wed May 30, 2007 12:16 pm

Hello all!

I'm currently working on some engine sounds and stumbled across some questions I couldn't find answers for. First off I looked at a sound.xml file similar to the one of the b52.
Quite self explanatory but 2 questions arise:

1.)Where is the origin/direction of the sounds played since there is no position/orientation specified in the file?

2.)What means factor and offset here? Offset direction?

<pitch>
<property>/engines/engine[0]/n2</property>
<factor>0.010</factor>
<offset>0.15</offset>
</pitch>

The second sound file is the one of the f16 and has major differences:
There more variables available but how are they applied (is x/y/z a position or a directional vector?) and how/where is inner-/outer-cone applied (units?)?

<orientation>
<x>-9.0</x>
<y>0.0</y>
<z>180.0</z>
<inner-cone>180.0</inner-cone>
<outer-cone>360.0</outer-cone>
<outer-gain>0.2</outer-gain>
</orientation>

Thanks in advance for pointing me in any direction in order to solve this questions,
glazmax
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Postby Harald » Wed May 30, 2007 9:18 pm

There is some explanations here README.xmlsound
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Postby glazmax » Thu May 31, 2007 7:31 am

Harald wrote:There is some explanations here README.xmlsound


Thanks for the link, I overlooked that one! :roll:
Answers most of the questions except the one about the source of the sound.
I will keep experimenting.

g,
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Postby Maik » Sat Jul 07, 2007 12:09 pm

Hi glazmax,

there is a bug within the directions and positions of sound. It was fixed in the last days and will be in cvs within the next days for the plib-branch, (in the head/osg branch it is fixed since one week. Please update your readme. xmlsound, too).

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Postby glazmax » Sat Jul 07, 2007 6:33 pm

Thanks for reporting Maik!

I withnessed a stereo sound feeling several days ago when updating my osg branch :D .

Now, after satisfying the eyes, finally the ears can deliver some info. Sound is an underestimated factor when it comes to deliver an image of reality.

Roar free,
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