3d sound source scene node with OpenAL

buhatkj · Post by **buhatkj** » Tue Aug 23, 2005 5:39 am

Like the title says, I made one

You can download it here http://fmorg.sourceforge.net/tempstuff/3dSoundDemo.zip

I would love any feedback, let me know what is good, what is bad, what is missing, etc. I will check this thread.
Enjoy!

Guest · Post by **Guest** » Tue Aug 23, 2005 6:17 am

it works for me here!

just a few questions:

1. do you have to recompile irrlicht for that? it would suck because everytime a new irrlicht version comes out you have to add the code

2. do you need the 2 openAL dll´s or is it possible to include them in the app? (static)

nice work man!

buhatkj · Post by **buhatkj** » Tue Aug 23, 2005 6:23 pm

Thanks GFXstyLER

1- No, it doesnt require a recompile to irrlicht, it is written much the same way as the custom scene node tutorial or the CCloudSceneNode - that is, it is an add-on which you must include along with irrlicht in your application.

2- I don't know if there is a static library version of OpenAL, perhaps if a person was so inclined they could compile openAL as a static library and use that instead of the DLL's, that might result in a very slight speed improvement due to not needing to dynamically link at runtime, but I'm not sure it would be worth the trouble...

I would like to try and have this code work everyplace irrlicht does (ie. LINUX) so one of the other things I may improve in the future (in addition to added features and stuff) is to add a kdevelop project or makefile for linux and whatever code changes (if any) are needed to make it work there also. OpenAL supports OSS and ALSA so it should be possible....

On a not-quite-related note. I have been thinking lately, that it might be possible to do simple solid-body physics with a custom irrlicht animator..
thoughts?...has somebody already done this?...

afecelis · Post by **afecelis** » Tue Aug 23, 2005 10:35 pm

works ok, but got a bit confused by not having any point of reference (as a 3d model) to orient myself in space.

Acki had already written a good example for openal some time ago. I made a modded version based on it here:(open al include and lib folders are linked externally)
http://www.danielpatton.com/afecelis/files/OpenAl.zip

buhatkj · Post by **buhatkj** » Wed Aug 24, 2005 2:16 pm

good point afecelis-
I will try to add a test scene node or something attached to the sound source so that you can see visually where it is - and also useful would be maybe a movable camera, to which I could attach the "Listener".

thx for the suggestion

-Ted

-EDIT-
I tried out your modded version of acki's demo. It works very nicely, but I kinda like mine better because it uses a scene node instead of a custom function to update the position. I just really like the irrlicht scenegraph so I think i'll stick with that. As I did in my demo it lets me even use irrlicht's existing animators to move my sounds around. I think once I add a point of reference as you suggested the advantages of using a scene node for this will be more clear.

afecelis · Post by **afecelis** » Wed Aug 24, 2005 11:15 pm

great! if you make it a custom node then it will be much easier to set up environmental effects!

I'm glad the suggestion worked.

how about triggerable sounds? Would it be possible with your node?

buhatkj · Post by **buhatkj** » Thu Aug 25, 2005 1:03 am

might be able to do that with some sort of sound even listener thinger that would work with the sound driver class i wrote...
you would need to pass events to it in your event reciever similar to how you pass them to a camera, and you would need to define sound events somehow.
I'm not 100% on how I would do this but it is also a good idea.
I will try to look into it.
-Ted

buhatkj · Post by **buhatkj** » Sun Sep 04, 2005 3:05 am

I added an environment, and visual references with spiffy labels for the source and listener. the demo now much better demonstrates the 3d sound

here is the download link again:http://fmorg.sourceforge.net/tempstuff/3dSoundDemo.zip

Some things still need work, like the somewhat clumsy handling of the rolloff factors and reference distances...

Special thanks go to afecelis for his wise suggestions

Enjoy!

PS-sorry it took so long, i just dont have a lot of time to work on this stuff...

afecelis · Post by **afecelis** » Sun Sep 04, 2005 5:24 am

Nice work buhatkj!

A much better example to understand your concept, although I'm not getting any sound played at all.
I get a : "trying to play soundid:1" message.

perhaps I'm missing somethng?

buhatkj · Post by **buhatkj** » Sun Sep 04, 2005 7:13 am

I dunno, it seems to work on my machine...
I had a problem before with openal, where the same code worked great on my one machine, but on my other, i had no sound.
audiere worked great on both, but audiere has no 3d...
I think maybe openal (or the options i am running it with?) isnt fully compatible with some sound cards/drivers. I will try this out on other machines, and see if i can duplicate your trouble.
BTW, the "trying to play sound id: 1" message is totally normal, it isnt output from error checking. perhaps if i did add some more error checking you would get more useful debugging output...I will give that a whirl if i can duplicate the problem.

buhatkj · Post by **buhatkj** » Wed Sep 07, 2005 6:16 pm

I'm not sure what's going on, I've tried it on all my machines, and it works, though it is sort of quiet. I need headphones to really hear the effect, probably just how i'm handling the distance and rolloff factors, but it does sound right on all my PC's.
Has anyone else tried this besides afecelis? what were your experiences?
Also, Maybe what sound card and OS do you have?

etcaptor · Post by **etcaptor** » Wed Sep 07, 2005 11:31 pm

I've got same resul like afecelis.
No sound. Maybe must install OpenAL again??

MikeR · Post by **MikeR** » Thu Sep 08, 2005 10:14 pm

It worked fine for me. I'm wondering if it's looking for the dlls in the "proper" folder instead of the project folder?

buhatkj · Post by **buhatkj** » Thu Sep 08, 2005 10:52 pm

MikeR makes a good point... So, I uploaded the openAL redist installer to here:
http://fmorg.sourceforge.net/tempstuff/OpenALwEAX.exe
Afecelis and etcaptor: could you try installing it and let me know if that fixes it?
Thanks

etcaptor · Post by **etcaptor** » Fri Oct 07, 2005 8:59 am

@ buhatkj, I go back to developing of my openAL scene node and found the reason for unwished sound effects. just take a look on yours, but suppose that you will have the same problem. Attach listener to any fps camera and try whether sound is coming from right location. The main reason is that Irrlicht and OpenAL uses differents coordinate system. If I not mistake, but take a look here:

Also maybe any euler transformations for orientation are needed.

@Alvaro, I have not idea why in your example are divisions like /100

Irrlicht Engine

3d sound source scene node with OpenAL

is this node useful to you?

3d sound source scene node with OpenAL

response to questions...

good point...

triggers....

I have updated the download!!

no sound...

works on both machines...

MikeR's theory