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deal with 0 duration projectile interval

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This commit is contained in:
greytower 2007-04-17 01:17:27 +00:00
parent 8d662e51f7
commit 4f51f073a0
1 changed files with 5 additions and 3 deletions
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8
direct/src/interval/ProjectileInterval.py
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@ -111,10 +111,12 @@ class ProjectileInterval(Interval):
def calcStartVel(startPos, endPos, duration, zAccel):
# p(t) = p_0 + t*v_0 + .5*a*t^2
# v_0 = [p(t) - p_0 - .5*a*t^2] / t
t = duration
return Point3((endPos[0] - startPos[0]) / duration,
if (duration == 0):
return Point3(0, 0, 0)
else:
return Point3((endPos[0] - startPos[0]) / duration,
(endPos[1] - startPos[1]) / duration,
(endPos[2] - startPos[2] - (.5*zAccel*t*t)) / t)
(endPos[2] - startPos[2] - (.5*zAccel*duration*duration)) / duration)
def calcTimeOfImpactOnPlane(startHeight, endHeight, startVel, accel):
return PythonUtil.solveQuadratic(accel * .5, startVel,