From 0d977f5ee3fc824135a3fdbea8526d1d2e27f41f Mon Sep 17 00:00:00 2001
From: Josh Wilson <hatjosh@users.sourceforge.net>
Date: Wed, 16 Jan 2008 19:25:05 +0000
Subject: [PATCH] throwing an error in projectile interval if
 calcTimeOLastImpactOnPlane() fails

---
 direct/src/interval/ProjectileInterval.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/direct/src/interval/ProjectileInterval.py b/direct/src/interval/ProjectileInterval.py
index 14941e3ea0..313bf9b7c0 100755
--- a/direct/src/interval/ProjectileInterval.py
+++ b/direct/src/interval/ProjectileInterval.py
@@ -195,8 +195,12 @@ class ProjectileInterval(Interval):
             # stop when we reach endZ
             self.startVel = calcStartVel(self.startPos, wayPoint,
                                          timeToWayPoint, self.zAcc)
-            self.duration = calcTimeOfLastImpactOnPlane(
+            time = calcTimeOfLastImpactOnPlane(
                 self.startPos[2], endZ, self.startVel[2], self.zAcc)
+            if time is None:
+                self.notify.error(
+                    'projectile never reaches plane Z=%s' % endZ)
+            self.duration = time
             self.endPos = None
         else:
             self.notify.error('invalid set of inputs to ProjectileInterval')