Movement: Difference between revisions
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Movement is one of the core aspects of Teeworlds and DDrace. | Movement is one of the core aspects of Teeworlds and DDrace. | ||
== Basics == | == Basics == <!--T:2--> | ||
=== Gravity === | === Gravity === <!--T:3--> | ||
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Every tick the acceleration of 0.5 is added to the y velocity (downwards) due to gravity. | Every tick the acceleration of 0.5 is added to the y velocity (downwards) due to gravity. | ||
=== Jumping === | === Jumping === <!--T:5--> | ||
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Ground jumping sets a tee's y velocity to -13.2, scaled by a value. | Ground jumping sets a tee's y velocity to -13.2, scaled by a value. | ||
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Air jumping (double-jump) sets a tee's y velocity to -12.0, scaled by a value. | Air jumping (double-jump) sets a tee's y velocity to -12.0, scaled by a value. | ||
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Jumping will ''set'' the y velocity, cancelling out any previous upwards or downwards velocity. This is very useful in scenarios where you need to halt large vertical impulses. | Jumping will ''set'' the y velocity, cancelling out any previous upwards or downwards velocity. This is very useful in scenarios where you need to halt large vertical impulses. | ||
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=== Horizontal Movement: === | === Horizontal Movement: === <!--T:9--> | ||
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* Pressing nothing: | * Pressing nothing: | ||
** Ground: Every tick <syntaxhighlight lang="c++" inline="">velocity.x = velocity.x * 0.5</syntaxhighlight> | ** Ground: Every tick <syntaxhighlight lang="c++" inline="">velocity.x = velocity.x * 0.5</syntaxhighlight> | ||
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Friction is ignored when holding down a key. So, at high velocities, pressing nothing will slow a tee down faster than moving in the opposite direction, as the friction will have an exponential slowdown compared to the <code>a/d</code> linear slowdown. | Friction is ignored when holding down a key. So, at high velocities, pressing nothing will slow a tee down faster than moving in the opposite direction, as the friction will have an exponential slowdown compared to the <code>a/d</code> linear slowdown. | ||
== Advanced == | == Advanced == <!--T:12--> | ||
=== Max Speed === | === Max Speed === <!--T:13--> | ||
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Max speed: 6000 Sub-tiles/Tick (+speedup in one tick, e.g. gravity, jetpack, explosion). | Max speed: 6000 Sub-tiles/Tick (+speedup in one tick, e.g. gravity, jetpack, explosion). | ||
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<code>src/game/gamecore.cpp</code> (before calculating new position from velocity):<syntaxhighlight lang="c++"> | <code>src/game/gamecore.cpp</code> (before calculating new position from velocity):<syntaxhighlight lang="c++"> | ||
if(length(m_Vel) > 6000) | if(length(m_Vel) > 6000) | ||
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</syntaxhighlight>This is the bottleneck in vertical movement. In horizontal movement a “ramp”-Value is multiplied to the horizontal speed. Causing the tee to slow down and stop when getting too fast. This is most commonly observed in speed ups. | </syntaxhighlight>This is the bottleneck in vertical movement. In horizontal movement a “ramp”-Value is multiplied to the horizontal speed. Causing the tee to slow down and stop when getting too fast. This is most commonly observed in speed ups. | ||
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The speed is rounded down to a precision of <math>\frac{1}{256}</math> every tick. This is causing the tee to stop moving horizontal when having too much speed. | The speed is rounded down to a precision of <math>\frac{1}{256}</math> every tick. This is causing the tee to stop moving horizontal when having too much speed. | ||
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=== Corner Skimming === | === Corner Skimming === <!--T:17--> | ||
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A tee is considered on the ground only due to its position and distance to the ground - it does not require the tee to have downwards velocity. So, it is possible for a tee to be "grounded" while traveling upwards, as long as the tee skims the corner of a tile. | A tee is considered on the ground only due to its position and distance to the ground - it does not require the tee to have downwards velocity. So, it is possible for a tee to be "grounded" while traveling upwards, as long as the tee skims the corner of a tile. | ||
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Corner skimming: | Corner skimming: | ||
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* allows a tee to refresh its double-jump (useful when skipping maps such as [https://ddnet.org/maps/Impetuous Impetuous]). | * allows a tee to refresh its double-jump (useful when skipping maps such as [https://ddnet.org/maps/Impetuous Impetuous]). | ||
* can apply ground acceleration and max speed to a tee for a short amount of time (assuming the tee's horizontal midair speed is less than the maximum ground speed prior to corner skimming) | * can apply ground acceleration and max speed to a tee for a short amount of time (assuming the tee's horizontal midair speed is less than the maximum ground speed prior to corner skimming) | ||
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Corner skimming is not often intentionally used in map parts (except for maps such as [https://ddnet.org/maps/Short-32-And-32-Precise-32-7/ Short and Precise 7]), but can be used in short speedruns as small optimizations. | Corner skimming is not often intentionally used in map parts (except for maps such as [https://ddnet.org/maps/Short-32-And-32-Precise-32-7/ Short and Precise 7]), but can be used in short speedruns as small optimizations. | ||
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=== Elevated Jump === | === Elevated Jump === <!--T:22--> | ||
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A ground jump can be performed even if the tee is a few subunits above the ground. | A ground jump can be performed even if the tee is a few subunits above the ground. | ||
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[[Category:Game-Mechanic{{#translation:}}]] | [[Category:Game-Mechanic{{#translation:}}]] | ||