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code for inverse-square volume attenuation

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This commit is contained in:
Darren Ranalli 2003-07-10 21:14:18 +00:00
parent 8176ae9423
commit 752c6ce4b4
1 changed files with 24 additions and 2 deletions
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26
direct/src/showbase/SfxPlayer.py
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@ -1,16 +1,32 @@
import math
class SfxPlayer: class SfxPlayer:
""" """
Play sound effects, potentially localized. Play sound effects, potentially localized.
""" """
UseInverseSquare = 0
def __init__(self): def __init__(self):
# Distance at which sounds can no longer be heard # Distance at which sounds can no longer be heard
# This was determined experimentally # This was determined experimentally
self.cutoffDistance = 120.0 self.cutoffDistance = 120.0
# cutoff for inverse square attenuation
#self.cutoffDistance = 300.0
# volume attenuates according to the inverse square of the
# distance from the source. volume = 1/(distance^2)
# this is the volume at which a sound is nearly inaudible
self.cutoffVolume = .02
# this is the 'raw' distance at which the volume of a sound will
# be equal to the cutoff volume
rawCutoffDistance = math.sqrt(1./self.cutoffVolume)
# this is a scale factor to convert distances so that a sound
# located at self.cutoffDistance will have a volume
# of self.cutoffVolume
self.distanceScale = rawCutoffDistance / self.cutoffDistance
def getLocalizedVolume(self, node): def getLocalizedVolume(self, node):
""" """
Get the volume that a sound should be played at if it is Get the volume that a sound should be played at if it is
@ -21,7 +37,13 @@ class SfxPlayer:
if d > self.cutoffDistance: if d > self.cutoffDistance:
volume = 0 volume = 0
else: else:
volume = (1 - (d / self.cutoffDistance)) if SfxPlayer.UseInverseSquare:
sd = d*self.distanceScale
volume = min(1, 1 / (sd*sd))
#print d, sd, volume
else:
volume = 1 - (d / self.cutoffDistance)
#print d, volume
return volume return volume
def playSfx(self, sfx, looping = 0, interrupt = 1, volume = None, time = 0.0, node=None): def playSfx(self, sfx, looping = 0, interrupt = 1, volume = None, time = 0.0, node=None):