Atti

math.sin + math.cos

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These math functions are used to get a position in front of a player, by getting his rotation, i.e. for spawning ramps.

Now i need them in my script, but i don't like using things that i don't understand, so can you simply explcate me how these work? Or at least what values should i pass to the functions.

Thx a lot if you can do it, i'm really a n00b in maths. :P

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Search for math.sin and you'll find the answer. Someone already posted a code-snippet for spawning objects with the sin/cos function. And it doesn't require any mathematical knowledge to understand it.

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I've got no problems copying that code. I just would like to understand why an x coord reduced by the sin of the radius of the Z rotation is placed in fornt of the player. :fadein:

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It's basic trig - how to rotate a point round any other. In the ramp examples the origin is set to the vehicle/player and the remote object becomes the "point" to be rotated.

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Useless page. I know functions, i dunno WHAT are sin and cos. :mrgreen:

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Useless page. I know functions, i dunno WHAT are sin and cos. :mrgreen:

you might wanna ask your maths teacher :P or visit this site

http://en.wikipedia.org/wiki/Trigonometry

and these sites are awesome to help you visualize how the trigonometric circle works

http://www.senocular.com/flash/source.php?id=0.114

http://www.edumedia-sciences.com/a348_l ... ircle.html

keep in mind that Lua uses radians for math.cos, math.sin etc and MTA uses degrees, so for example if you get a player's rotation you need to convert it to radians when using these functions like this: math.cos ( math.rad ( getPlayerRotation ( getLocalPlayer() ) )

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Useless ? Wow. I shows EXACTLY how they work with the examples. My god...

And inverses

math.acos , math.asin

Return the inverse cosine and sine of the given value.

> = math.acos(1)

0

> = math.acos(0)

1.5707963267949

> = math.asin(0)

0

> = math.asin(1)

1.5707963267949

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Useless ? Wow. I shows EXACTLY how they work with the examples. My god...

well someone who doesn't know trig can find it useless

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You can learn how it works. I don't know trig but I can understand it and I learned from using LUA. Just make some simple math functions that output the answer to chat to learn them.. It is fairly simple.

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You can learn how it works. I don't know trig but I can understand it and I learned from using LUA. Just make some simple math functions that output the answer to chat to learn them.. It is fairly simple.

dunno about you but if I didn't know about the basics of trig I'd have no idea what sine and cosine are, I'd say it outputs random numbers :P and probably would ask for help like Atti did

Lua doesn't teach you math

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Trig isn't really the best way to understand what exactly sin and cos are.

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I get sin and cos extensively at school and I work with them (at school) regularly, but I cant really visualize what happens when you do it on the x,y,z coords.

But I guess i'd just have to experiment and see

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