virtual PhysicsObject * make_copy() const =0
dynamic copy.
virtual void output(ostream &out) const
Write a string representation of this instance to <out>.
describes a particle that spins along its z axis.
virtual PN_stdfloat get_theta() const
for spriteParticleRenderer
An individual, physically-modelable particle abstract base class.
virtual void write(ostream &out, int indent=0) const
Write a string representation of this instance to <out>.