Rocket Uppercut: Difference between revisions

Latest revision as of 18:16, 17 July 2024

Performing a rocket uppercut in Forbidden Jungle near the Fisherman.

A rocket uppercut is a movement technique that propels Jak vertically while maintaining a grounded state. The technique has applications in many speedrun categories and is one of the key components in Lava Tube Skip.

A rocket uppercut is performed by interrupting Jak's uppercut animation and maintaining the uppward momentum of the uppercut while returning to a grounded (or standing) state. This can be done by making brief contact with vertically oriented ground collision or by having a cutscene play during the uppercut animation.

Technical

Explanation

Some surfaces in the game are programmed to have ground collision for walking on, such as grass and wooden planks. While ground collision is intended for horizontal surfaces, it was sometimes mistakenly used when designing vertically oriented landscape details, such as the sides of a wooden plank. The wooden planks on the mine cart rails in Volcanic Crater are programmed with ground collision so Jak is able to walk on them, but every side of the wooden planks has ground collision assigned to it. This oversight allows Jak to perform rocket uppercuts off the sides of the wooden planks and to "walk" underneath the wooden planks by repeatedly pressing X.

Occurrences

Discovery

The rocket uppercut sometimes occurs during casual playthroughs so it is impossible to determine who first performed the trick. The first person to utilize a rocket uppercut in speedruns was Billbraid when performing an older variant of red sage cutscene skip.

Other Notes

Movement Techniques
Jak and Daxter: The Precursor Legacy	Boosted Uppercut • Checkpoint Bypass • Direction Shift Boosted • Eco Boost • Extended Uppercut • Fall Damage Animation Cancel • Fast Swim • Ground Cancel Jump • Ice Momentum • Infinite Bounce • Jump Pad One Frame • Jump Pad Hitbox Extension • Kuitar Bounce • Lava Walk • Proxy Jump • Quad Jump • Rocket Uppercut • Scoutfly Boosted • Super Boosted • Water Hops • Water Roll Jump • Wet Feet • Zoom Walk
Jak II	Abahbounce • Boosted Uppercut • Checkpoint Bypass • Extended Uppercut • Dark Jak Extended • Fast Swim • Jetboard (Extended Frontflip, Hover Glitch) • Proxy Jump • Rocket Uppercut • Vehicle Clip • Vehicle Fling • Vehicle Jump • Vehicle Substitution • Wastelander Move • Water Roll Jump
Jak 3	Abahbounce • Boosted Uppercut • Checkpoint Bypass • Concussor Spin Jump • Extended Uppercut • Dark Jak Extended • Fast Swim • Glitch High Jump • Infinite Flight Glitch • Jetboard (Extended Frontflip, Hover Glitch) • Peace Maker Launch • Proxy Jump • Rocket Uppercut • Speed Zoomer • Vehicle Clip • Vehicle Jump • Vehicle Substitution • Wastelander Move • Water Roll Jump • Wave Concussor Infinite Jumps
Jak X: Combat Racing	placeholder text
Daxter	Angled Camera • Autosave Disabled • Corner Clipping • Elevator Boost • Extended Jump • Late Jump • Platform Boost • Proxy Jump • Scooter Proxy • Single Jumping • Slant Boost • Swing Boost • Trampoline Proxy • Vent Clip
Jak and Daxter: The Lost Frontier	Ground Pound Ledge Grab • Matrix Uppercut

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 [[File:Rocket Uppercut in Forbidden Jungle.gif|frame|Performing a rocket uppercut in Forbidden Jungle near the Fisherman.]]
-A '''rocket uppercut''' is a movement technique that propels Jak vertically while maintaining a grounded state. The technique has applications in many speedrun categories and is one of the key components in [[Lava Tube Skip]]. A rocket uppercut is performed by uppercutting into a small piece of vertically oriented ground collision. During the uppercut, Jak makes brief contact with the vertically oriented ground collision which sets him to a grounded state. This brief contact also amplifies the vertical momentum from the uppercut, similar to the amplified horizontal momentum of a [[Boosted Uppercut|boosted uppercut]]. The end result is Jak flying up into the air in a grounded state able to perform a limited amount of movement options before descending and entering his falling state.
+A '''rocket uppercut''' is a movement technique that propels Jak vertically while maintaining a grounded state. The technique has applications in many speedrun categories and is one of the key components in [[Lava Tube Skip]].
-Rocket uppercuts can also be performed by having cutscenes interrupting the uppercut instead of a grounded state, as seen in [[Yellow Vent Uppercut]].
+A rocket uppercut is performed by interrupting Jak's uppercut animation and maintaining the uppward momentum of the uppercut while returning to a grounded (or standing) state. This can be done by making brief contact with vertically oriented <code>ground</code> collision or by having a cutscene play during the uppercut animation.
 == Technical ==
 === Explanation ===
-Some textures within the game are programmed to have ground collision for walking on, such as grass and wooden planks. While these textures were intended for horizontally oriented use only, they were reused when designing vertically oriented landscape details, such as grass hanging off of a cliff. The wooden planks in Volcanic Crater are programmed with ground collision so Jak is able to walk on them, but this is the case for all sides of each plank, meaning Jak can get a grounded state from the top, sides, and bottom of each plank. Many oversights like this exist within the game.
+Some surfaces in the game are programmed to have <code>ground</code> collision for walking on, such as grass and wooden planks. While <code>ground</code> collision is intended for horizontal surfaces, it was sometimes mistakenly used when designing vertically oriented landscape details, such as the sides of a wooden plank. The wooden planks on the mine cart rails in Volcanic Crater are programmed with <code>ground</code> collision so Jak is able to walk on them, but every side of the wooden planks has <code>ground</code> collision assigned to it. This oversight allows Jak to perform rocket uppercuts off the sides of the wooden planks and to "walk" underneath the wooden planks by repeatedly pressing X.
 <youtube>https://www.youtube.com/watch?v=Qp3nql3ERnw</youtube>