sacred_k/docs/dwarf-arts.md

Dwarf arts: Kanonenschuss and Mörsergranate

Requests (2026-10-25 / 2026-10-26)

• Kanonenschuss (art 0x43f, gui_spells_kanone): "remove the knockback, instead it can be just a stun" (chosen: no push, only a stun); the range increased for the wider view; the stun particles not on targets that avoided the stun. The game's stun resistance stays (2026-10-26: "we dont ignore anything, the skill is fine for now").
• Mörsergranate (art 0x43e, gui_spells_moerser): "the radius of the explosion should increase every 5 skill levels".

Measured

• The cannon's code is the combat move function 0x5145d0, case 0x43f. Its ray: cmp edi,19h at 0x517389, 25 steps of 40 = 1000 range. Hostile targets get cEvent_creature 5 from 0x51768d.
• Stun chance 0x4fc810(level, creature) = level × 5 / creature level × 100 (UI_STAT_STUNNCHANCE). On a successful roll: 0x5936e0(MOTION_HIT_A 0xaf, 3.0, 0.25) at 0x517709 (pushes from 0x5176f8), then the stun order cEvent_creature 3 with +0x14 = 100, sent by call [eax+18h] at 0x5177aa (returns to 0x5177ad).
• The stun is the knockback. cCreature::ReceiveOrder 0x52e400 case 3: first the resistance vf24(0x50) (0x55d0a0: flag +0x4f0 & 0x1000 resists 2 in 3, effect 0x35d a percentage); otherwise push left +0x24d = 100, flag +0x200 |= 0x20000, attacker +0x259, ResetToIdle. cCreature::Update branch 0x594c82 moves a creature with that flag away from the attacker and lowers the push left by each step (0x594deb), measured about 100 units in 0.3 s; at 0 the flag is cleared.
• The impact effect TYPE_FX_DWARF_SHOOT_IMPACT (0x47f) is created on every hit target by CreateAt at 0x517855 (target in ebx), resisted or not.
• Mörsergranate: the grenade (type 0x3fa) lands and creates TYPE_FX_GRENADEIMPACT (0x3fc), which gathers its targets with cObjectManager 0x5ff820 (called from 0x5ab400 at 0x5ab63d): a creature is hit when its distance is below the impact's size (150, type table 0x428bb0) plus its own type's size.

The mod (src/mods/dwarfarts.cpp)

• The HIT_A motion is jumped over (0x5176f8: jmp past the call).
• The push step at 0x594deb calls PushStepThunk: creatures the cannon stunned (order 3 from 0x5177ad, kept with an end time) move by 0 and keep their push left above 0 for 1.5 s, so they stand still, then carry on.
• The impact effect is created only on targets in the stun state.
• The ray gets 45 steps (1800); confirmed to reach across the widened view.
• The impact's gather call gets a radius of size × (1 + 0.1 × (level / 5)), with the owner's Mörsergranate level (game::ArtLevel). The growth 0.1 per step is our choice; not yet seen in the game (Borf's level is 2).

Mörsergranate impact marker (asked 2026-10-25, done 2026-10-26)

"Show exactly where the grenade will land and its explosion radius, a red circle with low alpha on the ground."

Measured:

• The landing point is decided at launch (0x5145d0 case 0x43e): the target's position, or, closer than 200, a point 200 from the dwarf with a +-15 jitter. It goes to the new grenade (type 0x3fa) in cEventFX 0x96, constructed at 0x5169fa (cEventFX::Construct 0x41e0a0, thiscall, ret 0x44: code, owner id, target id, position area / x / y / level, ...).
• The impact gathers its targets at exactly that point, on several frames. The grenade object stays about 30 s after the explosion.
• Ground -> screen: 0x622700 (world units -> world pixels, the isometric plane), then (pixel - camera +0x14/+0x18) / zoom +0xb60 + screen centre (floating texts 0x41e546). Checked with the hero: the screen centre.
• The world view draws the ground (0x62d530, ground quad list), then the objects.

Mod: the construct call notes grenade, owner, landing point and radius (ImpactRadius, shared with the hit check); after 0x62d530 a disc (alpha 0x40) with a 2 px rim (alpha 0xa0) is drawn there, without depth test, until the impact of that owner's grenade at that point gathers its targets.