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Fix example #165

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Dec 30, 2024
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Fix example #165

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14 changes: 9 additions & 5 deletions docs/examples/30_degree_rule.pct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@
#
# ## Assumptions
#
# We will use the default pooltool physics engine, which assume perfectly elastic and frictionless ball-ball collisions. Read more [here](https://ekiefl.github.io/2020/04/24/pooltool-theory/#section-ii-ball-ball-interactions).
# We'll use one of pooltool's simpler ball-ball models which assumes perfectly elastic and frictionless ball-ball collisions. Read more [here](https://ekiefl.github.io/2020/04/24/pooltool-theory/#section-ii-ball-ball-interactions).
#
# Importantly, the cue ball must be rolling (without slippage) when it contacts the object ball. Otherwise, the 30-degree rule will not hold. As an extreme example of this, a cue ball with no spin will deflect off the object ball along the [tangent line](https://billiards.colostate.edu/faq/stun/90-degree-rule/).
#
Expand Down Expand Up @@ -117,13 +117,17 @@
system = system_template.copy()

phi = pt.aim.at_ball(system, "obj", cut=30)
system.cue.set_state(V0=3, phi=phi, b=0.8)
system.cue.set_state(V0=3, phi=phi, b=0.4)

# %% [markdown]
# Now, we [simulate](../autoapi/pooltool/index.rst#pooltool.simulate) the shot and then [continuize](../autoapi/pooltool/evolution/continuize/index.html#pooltool.evolution.continuize.continuize) it to store ball state data (like coordinates) in $10\text{ms}$ timestep intervals.

# %% trusted=true
pt.simulate(system, inplace=True)
# Create a default physics engine and overwrite ball-ball model with frictionless, elastic model.
engine = pt.physics.PhysicsEngine()
engine.resolver.ball_ball = pt.physics.get_ball_ball_model(pt.physics.BallBallModel.FRICTIONLESS_ELASTIC)

pt.simulate(system, engine=engine, inplace=True)
pt.continuize(system, dt=0.01, inplace=True)

print(f"System simulated: {system.simulated}")
Expand Down Expand Up @@ -283,8 +287,8 @@ def get_carom_angle(system: pt.System) -> float:
def simulate_experiment(V0: float, cut_angle: float) -> pt.System:
system = system_template.copy()
phi = pt.aim.at_ball(system, "obj", cut=cut_angle)
system.cue.set_state(V0=V0, phi=phi, b=0.8)
pt.simulate(system, inplace=True)
system.cue.set_state(V0=V0, phi=phi, b=0.4)
pt.simulate(system, engine=engine, inplace=True)
return system


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