class Bullet(GameObject):
lifetime = 120.0
def __init__(self, world, parent, color, pos, dir, radius, density, posParent=None):
GameObject.__init__(self, world)
self.color = makeVec4Color(color)
self.scale = radius
self.collisionCount = 0
diameter = 2 * radius
length = 1.815 * diameter
self.node = parent.attachNewNode("")
if posParent == None:
self.node.setPos(*pos)
else:
self.node.setPos(posParent, *pos)
self.node.setColorScale(self.color)
self.node.setTransparency(TransparencyAttrib.MAlpha)
self.node.setScale(radius)
self.node.lookAt(self.node, *dir)
self.node.setHpr(self.node.getHpr() + Vec3(0, 270, 0))
self.model = loader.loadModel("models/bullet.egg")
self.model.reparentTo(self.node)
self.model.setPos(-0.1, -0.1, 0.15)
self.model.setScale(0.4)
self.mass = OdeMass()
self.mass.setCylinder(density, 3, radius, length)
self.body = OdeBody(world.world)
self.body.setMass(self.mass)
self.body.setPosition(self.node.getPos())
self.body.setQuaternion(self.node.getQuat())
self.body.setData(self)
self.body.setGravityMode(False)
self.geom = OdeCylinderGeom(world.space, radius, length)
self.geom.setBody(self.body)
world.space.setSurfaceType(self.geom, world.surfaces["bullet"])
# Adjust collision bitmasks.
self.geom.setCategoryBits(GameObject.bitmaskBullet)
self.geom.setCollideBits(GameObject.bitmaskAll & ~GameObject.bitmaskCharacter)
# Keep the bullet hidden for a split second so it doesn't appear too close to the camera.
self.node.hide()
taskMgr.doMethodLater(0.1, self.showTask, 'show-bullet')
def onCollision(self, otherBody, entry):
self.body.setGravityMode(True)
# Dissipate energy based on collision impact.
factor = 1.0 - (min(entry.getContactGeom(0).getDepth(), 0.8) * 0.7)
factor = min(factor, 0.98)
base.taskMgr.doMethodLater(0.05, self.dissipateTask, "bullet-dissipate", extraArgs=[factor])
# Reduce the lifespan.
self.collisionCount += 1
if self.collisionCount == 25:
self.life = Bullet.lifetime
taskMgr.add(self.fadeTask, "bullet-fade")
def dissipateTask(self, factor):
self.dissipate(factor)
def fadeTask(self, task):
if self.life > 0:
self.life -= 1
self.node.setAlphaScale(4.0 * self.life / Bullet.lifetime)
return task.cont
else:
self.destroy()
return task.done
def showTask(self, task):
if self.node != None:
self.node.show()
