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Avoid negative square root

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Which seems to happen if a kart is going backward
This commit is contained in:
Benau 2016-05-03 15:44:44 +08:00
parent a852c9857e
commit bf64ce9ec0
1 changed files with 8 additions and 1 deletions
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9
src/items/flyable.cpp
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@ -317,7 +317,14 @@ void Flyable::getLinearKartItemIntersection (const Vec3 &origin,
* (dx * cosf(target_kart_heading) -
dz * sinf(target_kart_heading) );
float fire_th = (dx*dist - dz * sqrtf(dx*dx + dz*dz - dist*dist))
float f = dx*dx + dz*dz - dist*dist;
// Avoid negative square root
if(f>0)
f = sqrtf(f);
else
f = 0.0f;
float fire_th = (dx*dist - dz * f)
/ (dx*dx + dz*dz);
if(fire_th>1)
fire_th = 1.0f;