546 - bombShield(int a, int script)

Sets the bomb invulnerability flag (a=0 false, a=1 true), the caller's ANM script will change to script when a bomb is active.

Point Player Hitbox Bug

  • Versions: 1.00a
  • Difficulty: Easy - Normal - Hard - Lunatic - Extra
  • Mode: Main game - Practice mode - Spell practice
  • Shottype: Reimu - Marisa

The player's hitbox is a point with no radius, effectively making the player's hitbox much smaller than what it is supposed to be.

An in-game screenshot of Reimu with a massive hitbox.
Figure 1: A modified version of th20 in which Reimu has an increased hitbox sized similar to the spell-card "You Grow Bigger!" in th14. This image exaggerates the point that the player's hitbox is a point with no radius.

The final player hitbox size is calculated as follows:

final_hitbox = (hitbox_radius * hitbox_scale) / 100.0
  • final_hitbox: the final hitbox radius of the player
  • hitbox_radius: the hitbox radius of the player, which is 3 for both Reimu and Marisa.
  • hitbox_scale: the hitbox scalar, which is a value between [0, 100].

For the point player hitbox bug to happen, hitbox_scale must be 0.

The variable hitbox_scale is initialized to 0 and no other part of the code modifies it, meaning that its value will always remain 0 making final_hitbox always be 0 as well. This causes the player hitbox to be a single point.

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