Need to find a side on triangle - Cog Forum - The Massassi Temple Forums Archive

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Need to find a side on triangle

2002-12-26, 1:33 PM #1

Hellcat

Registered User

Posts: 715

I need to find R on the diagram using cog. But the problem is I dont think cog has sin. I have alpha, and L.

Heres the picture:

[http://24.46.164.108:81/jkteambattle/images/media/needtofindr.gif]

Anyone got any ideas?

Team Battle.

2002-12-26, 1:45 PM #2

GBK

Posts: 10,562

Nope. No sin. Hehe, trig is a sin. [http://forums.massassi.net/html/smile.gif]

And when the moment is right, I'm gonna fly a kite.

2002-12-26, 1:47 PM #3

Hellcat

Registered User

Posts: 715

Oi, thats not helpful! I need a solution [http://forums.massassi.net/html/frown.gif]

Team Battle.

2002-12-26, 1:57 PM #4

Hellcat

Registered User

Posts: 715

I spose I could write an array of values and then use that. Still not my favourite solution [http://forums.massassi.net/html/frown.gif]

Team Battle.

2002-12-26, 1:57 PM #5

GBK

Posts: 10,562

A solution? Find some other way to do what you need. [http://forums.massassi.net/html/frown.gif]

Sorry man, there just isnt any sine functions in cog.

And when the moment is right, I'm gonna fly a kite.

2002-12-27, 4:14 AM #6

MikeC

Editing Guru

Posts: 4,678

Quote:

<font face="Verdana, Arial" size="2">Originally posted by GBK:
Nope. No sin. Hehe, trig is a sin. </font>

I knew I had seen that in the Bible somewhere. I just couldn't find the chapter and verse when I went looking for it. [http://forums.massassi.net/html/wink.gif]

[http://forums.massassi.net/html/wink.gif]

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The Massassi A SW Galaxies Player Association

Have Lightsaber Will Travel JK Editing tips, troubleshooting information, resources and more.
www.swgalaxies.net For all your Star Wars Galaxies needs
The Massassi A SW Galaxies Player Association

2002-12-27, 6:16 AM #7

The_New_Guy

Registered User

Posts: 158

There are algebra approximations of sine
but I dont know if they are good enough for your purposes.

- Wisdom is 99% experience, 1% knowledge. -

2002-12-27, 9:49 AM #8

GBK

Posts: 10,562

You really couldnt do algebra in cog either . . thank God.

And when the moment is right, I'm gonna fly a kite.

2002-12-27, 9:57 AM #9

Emon

Imon, umon...everymon!

Posts: 19,022

You gotta do that opposite/adjacent etc and crap.

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2002-12-27, 10:18 AM #10

GBK

Posts: 10,562

Yeah. Trig. Hey, I know! Lets write a cog to do trig with Radians!!! [http://forums.massassi.net/html/rolleyes.gif]

And when the moment is right, I'm gonna fly a kite.

2002-12-27, 12:46 PM #11

Emon

Imon, umon...everymon!

Posts: 19,022

I was talking simply about division.

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2002-12-28, 3:32 AM #12

The_New_Guy

Registered User

Posts: 158

Not a solution but for everyones amusement I tried creating my own sin function in cog.

I took the algebraic estimation of sin from here: http://www.caffeinehigh.net/narf/the%20evils%20of%20sin.htm

and the result was:

Code:

# Rough Estimation of Sine Function using algebra
symbols

message     user1

flex        pi             local
flex        x              local
flex        sinofx         local
flex        xdegree        local

end
# =============================
code

user1:
xdegree = GetParam(0);    // Get submited value in degrees
pi = 3.141593;            // Establish pi - will JK allow more acuraccy than this ?
x = xdegree*pi/180;       // Convert degrees to radians
                          // Next line contains rough algebra estimation of Sine
sinofx = 32/(45*(pi*pi*pi*pi*pi)) * ((x*x*x*x*x) - (5*(pi*pi)*(x*x*x)) + (4*(pi*pi*pi*pi)*x));
ReturnEx(sinofx);         // Return answer to  Sin(degrees)
Return;

end

Unfortunately the estimation is way to rough to be usable. I hope you have better luck with your array method.

- Wisdom is 99% experience, 1% knowledge. -

2002-12-28, 6:19 AM #13

GBK

Posts: 10,562

Sure, that might work, but we still dont know what Hellcat needed it for in the first place.

And when the moment is right, I'm gonna fly a kite.

2002-12-28, 11:47 AM #14

Hellcat

Registered User

Posts: 715

I need to it take over the world mwhaha.

Actually I need quite close answers, so I am just writing out sin of 1, 2, 3, 4, etc than going from that. If I get lazy I might write very second value.

Team Battle.

2002-12-28, 11:42 PM #15

CaveDemon

Banned?

Posts: 1,694

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Hellcat:
I need to it take over the world mwhaha.

Actually I need quite close answers, so I am just writing out sin of 1, 2, 3, 4, etc than going from that. If I get lazy I might write very second value.</font>

Get The positions where R crosses the two sides of triangle, and use VectorDist();

How you would get the positions, that's not my problem [http://forums.massassi.net/html/tongue.gif]

[http://forums.massassi.net/html/tongue.gif]

------------------
Cave_Demon, an ***hole since '86

Last edited by mb; today at 10:55 AM.

2002-12-29, 12:43 AM #16

Hellcat

Registered User

Posts: 715

Yeah that what I was gonna do. Run a real fast pulse, fire a projectile from the vertexes on line L (use 90 - alpha) and find the closest point to where they crossed using getthingpos(). Using that position I could then use VectorDist();.

I already thought of that accept its not a nice solution, it would be easier to write them out [http://forums.massassi.net/html/tongue.gif]

Team Battle.

2002-12-29, 1:52 AM #17

CaveDemon

Banned?

Posts: 1,694

what you need this for, anyway? maybe i'll find another solution

------------------
Cave_Demon, an ***hole since '86

Last edited by mb; today at 10:55 AM.

2002-12-29, 8:04 AM #18

GBK

Posts: 10,562

Yes, do tell.

And when the moment is right, I'm gonna fly a kite.

2002-12-29, 12:25 PM #19

Hellcat

Registered User

Posts: 715

*Sigh*

I need to calculate the angular velocity and the centripedal force on a vehicle with a specific wheelbase.

And as we all know
R = L / sin(alpha)
So we can then calculate
F(c) = (m * v * v) / R

Understand what I'm trying to say?

Team Battle.

2002-12-29, 1:08 PM #20

The_New_Guy

Registered User

Posts: 158

Pinky: Egad! You astound me, Brain!

- Wisdom is 99% experience, 1% knowledge. -

2002-12-30, 6:21 PM #21

Hellcat

Registered User

Posts: 715

Huh?

Team Battle.

2002-12-30, 6:50 PM #22

Emon

Imon, umon...everymon!

Posts: 19,022

If JK used a more modern engine with a real programming language, you might be able to do that, but for JK, I think you might be boned. [http://forums.massassi.net/html/frown.gif]

Infact, on a more modern engine, you could use real physics with it instead of having to fake everything (I hate faking stuff).

Bassoon, n. A brazen instrument into which a fool blows out his brains.

2002-12-30, 7:11 PM #23

Hellcat

Registered User

Posts: 715

I'm not faking anything. Hense the reason why I am using all my sine values. I have written alot of my own physics in jk to handle a drivable vehicle(Currently using corvette specs, 5.7lt etc) All I need now is to finish the centripedal forces to add broadside capabilites. Unfortunatly I havnt found a good solution for the brakes. (I am using IsThingCrouching for acceleration, then applying thrust to the player.)

When its finished I will post a demo level in here for you all to play with.

Team Battle.