Trajectories
Trajectories draws the path a projectile will take before you throw or shoot it.
Settings
Disable uncharged bow
Hides the path until your bow is drawn back.
Highlight on entity
Highlights the entity the projectile will hit.
Shorten line
Starts the line a little in front of you instead of at your hand.
Line thickness
The line thickness.
Default
The line color when it won't hit anything.
Enemy Hit
The line color when it will hit a player or mob.
Wall Hit
The line color when it will hit a wall.
Ground Hit
The line color when it will land on the ground.
Max ticks
How far ahead the path is simulated, in ticks.
Show landing
Marks where the projectile lands.
Only when holding
Only draws while you hold something you can throw or shoot.
Add player velocity
Adds your own movement to the path. Vanilla 1.8 projectiles don't inherit it, so leave it off unless the server does.