Chaining Projectiles

This tutorial seeks to expand the reader’s notion of spell chaining to projectiles, demonstrating one way in which a projectile might be cast from the impact point of another projectile.

The following spell will be executed across two pages. It first cast a firebolt, storing the projectile’s direction vector. It then executes a series

of operations on the projectile’s result in order to generate a direction species by which to reflect the original direction vector. Finally, it uses the reflected direction vector and the impact point position vector to cast a second firebolt, creating a ricochet effect.

Casts a firebolt, saving its direction vector onto the tag and cloning the impact position twice, leaving three species for the impact position vector on the capsum.

1) Gets the caster’s position.

2) Gets the caster’s look vector and saves a copy of this species onto the tag.

3) Casts the firebolt and retrieves the vector position from the impact result.

4) Duplicates the vector twice, meaning the capsum contains three copies of the impact position vector.

Uses the three impact position results, to cast a second firebolt from the impact point that emulates a ricochet.

5) Gets the block position of the block hit, and then gets the direction matching the face hit (up/north/east).

6) Reads the tag, pushing the original direction vector onto the head, and swaps. Then reflects the vector by the direction species.

7) The capsum contains the reflected vector and a copy of the impact position vector. Pushes an integer and completes the firebolt cast.