Question About Moving A Vector in 3d Space

TipTup · 2000-08-30T20:31:24

I have a function where I pass a vector to it, and the distance (speed) it should travel using the direction the vector is pointing in. My problem is when the vector is inverted like if you were performing a backflip the z change is not accurate, you fly backwards until your not inverted. GLfloat xc =(GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin(vector.yrot*PI/180); GLfloat xc2 = (GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin((vector.xrot)*PI/180); GLfloat yc=(GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin(vector.xrot*PI/180); GLfloat yc2 = (GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin((vector.xrot)*PI/180); GLfloat zc=(GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin((vector.yrot-90)*PI/180); GLfloat zc2 = (GLfloat)gs*(GLfloat)(speed)*(GLfloat)sin((vector.xrot)*PI/180); vector.x-=xc;//+xc2; vector.y+=yc+yc2; vector.z+=zc+zc2; [/source] all of the preceding code works except the zc2 line. (If you dont know what the bug is creating try flying inverted in Space Wars, you'll fly backwards. hehe. Here is the code I'm using for my vector: [source] typedef struct vector { GLfloat x,y,z,xrot,yrot,zrot; }vector; any ideas on how to fix the zc2 line? I dont know any 3d math at all, all the code was either created using a little 2d math or with trial and error. lol Thanks, -TipTup TipTup.Com Edited by - TipTup on 8/4/00 5:27:47 PM

NeHe Productions Affiliates

Started by TipTup August 04, 2000 05:26 PM

15 comments, last by TipTup 24 years, 5 months ago

Anonymous

August 07, 2000 09:16 AM

hey second Mr. anonymous thats not true either best to do is build a lookup table for sin and cos. So shut the fuck up you dumbass. You seem to have a lot of penis envy

Mak

899

August 11, 2000 02:20 PM

Sigh - sad isn''t it?

Mr. Anonymous 1 - take your dick envy and go away.
Mr. Anonymous 2 - well said Sir/Madam!

TipTup - don''t put up with this lamer from the past - go shoot him, or challenge him to a code fest!

Mr. Anon#1 - heed Mr Anon#2''s comment - if someone has "sloppy" code, who cares? If it works, and it gets results that''s great... when it''s time to optimise /then/ get rid of the sloppy bits.

Grandad''s advice : Forum''s are for forumming, not for slagging off others. (Forumming - New word #57 for the OED!)

awigga

114

August 12, 2000 06:56 PM

ok what the hell are all you guys talking about those are really some good tips when so you don''t some slow piece shit, like the stuff TipFuck always writes if you don''t know what you are talking don''t say anything, you''ll just make shmuck out of yourself. ain''t that right George Schmick aka shmuck

Styles

TipTup

Author

122

August 12, 2000 07:36 PM

lol Awigga, good job you can read my name off my website. I''m glad you can read, at least you learned how to do that in school, lmfao. BTW Been accepted to any good colleges lately? Thought so. lol

-TipTup
TipTup.Com

-TipTupTipTup.Com Speared Fish Design Studios My GameDev.Net Profile

ZenGeneral

122

August 12, 2000 07:55 PM

humm, I would use a matrix for rotations

Why Not?

gurule

122

August 30, 2000 08:14 PM

cool!

shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat

shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat

shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat

shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat

i fucked your mom!

by BLINK 182

shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat shit, piss, fuck, cunt, cocksucker, mother fucker, tits, fart, turd, & twat i fucked your mom! by BLINK 182

max621

139

August 30, 2000 08:31 PM

LOL THIS IS LAME!
That friend of yours Tip is really messed up :O
Hehe. Good luck with your rotations. Im having tough time getting even a 2d quad to rotate and move in the right direction