Problems getting 3d positioning working in isometric game

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	Problems getting 3d positioning working in isometric game

cliffski Registered User
Quote
2018-06-17 12:13:00

Hi there!
I'm currently making an isometric game (www.positech.co.uk/productionline) And using irrklang 32bit 1.6

My 3d placed sound volumes seem wrong, even random, and I think its because I'm misunderstanding the coordinate system. I've experimented a lot but got nowhere!

What I want is obviously L/R panning, and sounds getting louder as I zoom in.

when I place a sound in the game, the Z position is always 0 (ground level).
Here is my listener code:


	float zpos = 220.0f - (200.0f *  GUI_GetCamera()->GetRelativeZoom());

	vec3df position(focus.X, focus.Y, zpos);        // position of the listener
	vec3df lookDirection(0, 0, -1.0f); // the direction the listener looks into
	vec3df velPerSecond(0, 0, 0);    // only relevant for doppler effects
	vec3df upVector(0, 1, 0);        // where 'up' is in your 3D scene

	PEngine->setListenerPosition(position, lookDirection, velPerSecond, upVector);

Objects are placed in my isometric world in an x,y location, and that bit seems to work ok, its just the Z axis that confuses the hell out of me :D

A single tile in my world is 512.0f width. I'm not sure what units irrklang is using, is it meters.
My current rolloff and other settings are:


PEngine->setRolloffFactor(0.25f);


psnd->setMinDistance(30.0f);

I'm hoping that sounds will be heard maybe 5 tiles away from their source.
Any advice on the correct settings is very much appreciated.

niko Moderator
Quote
2018-06-17 19:13:56

Hi,

from just looking at this, I think your "upvector" should be (0,0,1), since the last coordinate seems to be "up in your world, right?

Alternatively, you could also just flip the y and z coordinate of your sound and listener positions and keep that upvector.

Also, if this still has problems, try setting the look direction to something lik (0.001, 0.001, -1.0f) instead, since some audio drivers seem to have a problem with a line going into the other direction of the upvector.

Hope this helps! Good luck with your game!

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