Edge on highjump blocks

Originally posted by Trolis

It depends on pre angle. Difficult thingie ;/

Exactly.

Look at this wonderful paint sketch done by an unknown artist to see how the angle goes. Nice.

Originally posted by Memories

dont understand how does it works kafds:F

i understand it,u must do the pre in a bigger and wider circle :)

thanks kafds :P

close thread

You should understand that EVERY higher than 70 unit edge gives edgefriction, so you have to avoid all edges, not only the one direction you are going to jump. Your pre might get too close to "side" edge, which also has EF. The edgefriction was designed to avoid players slipping from edges accidentally, so it's everywhere.




Someone tell me if i'm wrong. More physics and explanations quoted from Kreedz tutorials

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Kreedz tutorials, chapter 11. Highjump



Did you ever ask yourself why you have the feeling to be slowing down when doing a higher located jump? Sure, you did notice that. But why is that? What exactly is a highjump and why is it slowing you down if you are getting closer to the edge?

First of all we gotta ask ourselves: What is a highjump?

The answer is: Every jump with a height of 70+ units is called highjump, because it is way harder than a normal longjump. The borderline for longjumps/highjumps is exactly 70 units height, a jump with 69 units height is a normal longjump and a jump with 70 units height is a highjump. It doesn't matter whether a jump has a height of 70 or 7000 units by the way, there is no such thing as dynamic transitions.

Ok, so now we do know what a highjump is. But why is it harder than a normal longjump?

For a pretty long time we assumed that there was a gravity change caused by the engine, when jumping off a jump with a height of 70+ units, but that's wrong. Also it was assumed that it was a bug and it was not done on purpose by the engine creators. That's also wrong because there is a CVAR included called "edgefriction 0/1/2". The standard value of this command is "2", other values remove the "highjump effect" but are not allowed, since Kreedz maps are supposed to be played with default settings.

Furthermore our coder eDark found out that the slowdown is caused by the so called "edgefriction" effect. Here are some facts about it:

If you're running straight ahead towards the edge of a highjump you are going to lose 17% of your velocity! At first your velocity is going to decrease with about 7,5 units/s and in the end with 4,5 units/s. Every units/s you are "loosing" means that you are going to jump 0,74 units less than on a normal longjump.
The magical "point of no return", the point where the explained slowdown effect does start, is located about 13,6 units (when running a speed of 250 units/s) in front of the stone's edge.

This is how your speed looks like when running towards an edge of a highjump: http://xtreme-jumps.eu/img/hj.jpg


Thanks fly out to eDark for both, the calculation and the picture.


The faster that you are running (good prestrafe) the later you are going to get slowed down, which means you'll have a better speed when jumping off. The most important fact to get good speeds is the direction you are running - the direction are headed/looking to while running doesn't matter. If you are running parallel to the edge you do NOT lose speed at all... for the rest of the prestrafe you can use this formular:

Distance from edge without getting slower = sin(Angle when starting to run) x 13.6 units

Okay, so that's what makes a highjump more difficult than a longjump and brings us to the next question: How can I handle it? And what's the best way to do a good highjump?

We already learnt that running parallel to the edge does not make you lose your speed at all, therefore you need to modify your prestrafe according to that to get the best speeds. Other than that it is strongly recommended to jump off earlier than you would do on a longjump - because the longer you are running towards the edge the more speed you are going to lose.

-> Note: Other ways to trick the edgefriction are doing a bhop longjump or a countjump on the highjump. Both ways reduce or remove the edgefriction effect, however a countjump is the more effective way since the bhop longjump record is 247 units - but the countjump record 272 units. We'll learn more about countjumps in the next chapter.

Now, since you know all the facts about it, you should practise as much as possible and get a feeling for it and find your individual best way to do a good highjump. Good luck!
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