Editing Openai/694f5245-1110-800b-b182-7c2accd50046 (section)

==== 你把這段貼過去，並把你那組 SD 白格林特圖片一併附上（告訴它「請以附件圖片為角色參考」）： ====

<syntaxhighlight lang="text">PATCH 1 / Player Sprite + Weapon System (keep scope small)

Use the attached SD white mech images as the PLAYER reference.
Goal: replace placeholder blocks with a chibi-hardcore mech look (SD Gundam vibe).

A) Player sprite integration (2 directions only)
* Player uses a 45-degree angled sprite (NOT top-down).
* Only 2 directions needed: Right + mirrored Left.
* Anchor the sprite to the feet on the isometric floor. Add a small ground shadow blob.
* If image assets fail to load, draw a simple fallback mech with canvas shapes (so player never disappears).

Transparency (no sticker)
* Prefer real alpha PNG if available.
* If assets have a solid background (black/white), implement chroma-key removal in Canvas:
* treat near-black OR near-white as transparent (configurable threshold)
* do NOT remove bright highlights of the mech (keep careful threshold)

B) Weapon switching (Q/E) must work
* Implement inventory with 3 weapons now:
  1) Rifle (fast, stable)
  2) Shotgun (spread, close burst)
  3) Missile (slow fire, high dmg + small splash)
* Q/E cycles weapon. HUD updates weapon name instantly.
* Shooting behavior must clearly differ per weapon.

C) Keep everything else unchanged
* Do NOT refactor room generation, exits, or isometric projection in this patch.
* Only add player sprite rendering + weapon system.

Acceptance tests
* Player is visible in the first room with proper grounding/shadow.
* Q/E switches weapons; shots differ; HUD shows current weapon.
* No “sticker” background on the player (alpha/chroma-key works).

</syntaxhighlight>