Ledge Grab: Difference between revisions

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A ledge grab can occur when Mario's position is in the air and his next quarter step would move him inside a wall^[1]. If this happens, the game will verify several conditions:

Mario's vertical velocity is non-positive
There is a wall 30 units above Mario.
There is no wall 150 units above him.

If all conditions pass, the game searches for a potential ledge to grab. From Mario's position, it considers a point 60 units in the direction perpendicular to the wall and 160 units above. This point ends up being 10 units into the wall due to Mario's 50 unit radius. From that point, it searches top-down for the first floor hitbox. If a floor hitbox is found, Mario will ledge grab onto it.

Given these conditions, a ledge grab normally raises Mario between 30 units (inclusive) and 150 units (exclusive). Note that despite the search point starting 160 units higher than Mario's position, only a 150 unit raise is ordinarily possible because there would otherwise be a wall at the point 150 units above Mario.

It's possible to exploit the logic to do a glitchy ledge grab, allowing Mario to ledge grab a floor up to 238 units above. However, glitchy ledge grabs are rarely possible in practice due to the fact that ledge grabs are not possible where there is a wall 150 units above Mario. Fortunately, minor deviations from perfect geometry can cause there to be no wall 150 units above Mario.

Examples include:

The wall is slightly slanted forward
There are 2 walls meant to be coplanar that aren't
If there are 2 parallel walls with the lower one jutting out more

v • d • e Actions

Uninitialized

Stationary Actions	Idle • Start Sleeping • Sleeping • Waking Up • Panting • Hold Panting • Hold Idle • Heavy Hold Idle • Standing Against Wall • Coughing • Shivering • In Quicksand • 0x0E action • Crouching • Start Crouching • Stop Crouching • Start Crawling • Stop Crawling • Stop Slide Kick • Shockwave Bounce • First Person Action • Backflip Land Stop • Jump Land Stop • Double Jump Land Stop • Freefall Land Stop • Sideflip Land Stop • Hold Jump Land Stop • Hold Freefall Land Stop • Air Throw Land • Twirling Land • Lava Boost Land • Triple Jump Land Stop • Long Jump Land Stop • Ground Pound Land • Braking Stop • Butt Slide Stop • Hold Butt Slide Stop

Moving Actions	Walking • Hold Walking • Turning Around • Finish Turning Around • Braking • Riding Shell Ground • Heavy Hold Walking • Crawling • Burning Ground • Decelerating • Hold Decelerating • Begin Sliding • Hold Begin Sliding • Butt Slide • Stomach Slide • Hold Butt Slide • Hold Stomach Slide • Dive Slide • Move Punching • Crouch Slide • Slide Kick Slide • Hard Backward Ground Kb • Hard Forward Ground Kb • Backward Ground Kb • Forward Ground Kb • Soft Backward Ground Kb • Soft Forward Ground Kb • Ground Bonk • Death Exit Land • Jump Land • Freefall Land • Double Jump Land • Side Flip Land • Hold Jump Land • Hold Freefall Land • Quicksand Jump Land • Hold Quicksand Jump Land • Triple Jump Land • Long Jump Land • Backflip Land

Airborne Actions	Jump • Double Jump • Triple Jump • Backflip • Steep Jump • Wall Kick Air • Side Flip • Long Jump • Water Jump • Dive • Freefall • Top Of Pole Jump • Butt Slide Air • Flying Triple Jump • Shot From Cannon • Flying • Riding Shell Jump • Riding Shell Fall • Vertical Wind • Hold Jump • Hold Freefall • Hold Butt Slide Air • Hold Water Jump • Twirling • Forward Rollout • Air Hit Wall • Riding Hoot • Ground Pound • Slide Kick • Air Throw • Jump Kick • Backward Rollout • Crazy Box Bounce • Special Triple Jump • Backward Air Kb • Forward Air Kb • Hard Forward Air Kb • Hard Backward Air Kb • Burning Jump • Burning Fall • Soft Bonk • Lava Boost • Getting Blown • Thrown Forward • Thrown Backward

Underwater Actions	Water Idle • Hold Water Idle • Water Action End • Hold Water Action End • Drowning • Backward Water Kb • Forward Water Kb • Water Death • Water Shocked • Breaststroke • Swimming End • Flutter Kick • Hold Breaststroke • Hold Swimming End • Hold Flutter Kick • Water Shell Swimming • Water Throw • Water Punch • Water Plunge • Caught In Whirlpool • Metal Water Standing • Hold Metal Water Standing • Metal Water Walking • Hold Metal Water Walking • Metal Water Falling • Hold Metal Water Falling • Metal Water Fall Land • Hold Metal Water Fall Land • Metal Water Jump • Hold Metal Water Jump • Metal Water Jump Land • Hold Metal Water Jump Land

Cutscene Actions	Disappeared • Intro Cutscene • Star Dance Exit • Star Dance Water • Fall After Star Grab • Reading Automatic Dialog • Reading Npc Dialog • Star Dance No Exit • Reading Sign • Jumbo Star Cutscene • Waiting For Dialog • Debug Free Move • Standing Death • Quicksand Death • Electrocution • Suffocation • Death On Stomach • Death On Back • Eaten By Bubba • End Peach Cutscene • Credits Cutscene • End Waving Cutscene • Pulling Door • Pushing Door • Warp Door Spawn • Emerge From Pipe • Spawn Spin Airborne • Spawn Spin Landing • Exit Airborne • Exit Land Save Dialog • Death Exit • Unused Death Exit • Falling Death Exit • Special Exit Airborne • Special Death Exit • Falling Exit Airborne • Unlocking Key Door • Unlocking Star Door • Entering Star Door • Spawn No Spin Airborne • Spawn No Spin Landing • Bbh Enter Jump • Bbh Enter Spin • Teleport Fade Out • Teleport Fade In • Shocked • Squished • Head Stuck In Ground • Butt Stuck In Ground • Feet Stuck In Ground • Putting On Cap

Automatic Actions	Holding Pole • Grab Pole Slow • Grab Pole Fast • Climbing Pole • Top of Pole Transition • Top of Pole • Start Hanging • Hanging • Hang Moving • Ledge Grab • Ledge Climb Slow 1 • Ledge Climb Slow 2 • Ledge Climb Down • Ledge Climb Fast • Grabbed • In Cannon • Tornado Twirling

Object Related Actions	Punching • Picking Up • Dive Picking Up • Stomach Slide Stop • Placing Down • Throwing • Heavy Throw • Picking Up Bowser • Holding Bowser • Releasing Bowser

↑ https://github.com/n64decomp/sm64/blob/master/src/game/mario_step.c#L472

@@ Line 2: / Line 2: @@
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-A '''ledge grab''' works as follows: While Mario's position is in the air and against a wall, and he has a non-positive vertical speed, the game checks two conditions.
+A '''ledge grab''' can occur when Mario's position is in the air and his next [[Quarter Steps|quarter step]] would move him inside a wall<ref>https://github.com/n64decomp/sm64/blob/master/src/game/mario_step.c#L472</ref>. If this happens, the game will verify several conditions:
+* Mario's vertical velocity is non-positive
 * There is a wall 30 units above Mario.
 * There is no wall 150 units above him.
-If both conditions pass, the game searches for a potential ledge grab. From Mario's position, it considers a point 60 units in the direction perpendicular to the wall and 160 units above. This point ends up being 10 units into the wall due to Mario's 50 unit radius. From that point, it searches top-down for the first floor hitbox. If a floor hitbox is found, Mario will ledge grab onto it.
+If all conditions pass, the game searches for a potential ledge to grab. From Mario's position, it considers a point 60 units in the direction perpendicular to the wall and 160 units above. This point ends up being 10 units into the wall due to Mario's 50 unit radius. From that point, it searches top-down for the first floor hitbox. If a floor hitbox is found, Mario will ledge grab onto it.
 Given these conditions, a ledge grab normally raises Mario between 30 units (inclusive) and 150 units (exclusive). Note that despite the search point starting 160 units higher than Mario's position, only a 150 unit raise is ordinarily possible because there would otherwise be a wall at the point 150 units above Mario.

Ledge Grab: Difference between revisions

Latest revision as of 02:45, 26 December 2024

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Ledge Grab: Difference between revisions

Latest revision as of 02:45, 26 December 2024

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