# new question!!!

17 replies to this topic

### #1ramzi085

New Member

• Members
• 12 posts

Posted 08 December 2005 - 05:22 PM

Hi everybody,
plz i want a openGL code to make a flag seems fly(flap)
plz its very important...

### #2roxtar

Member

• Members
• 94 posts

Posted 08 December 2005 - 05:32 PM

You could take the flag to be two parallel sine waves which shift their phase a little bit in each frame.

for(phase=0;phase<360;phase++) {

for(theta=0;theta<360;theta++) {

x=(theta+phase)*PI/180;

y1=sin(x);

y2=sin(x)+y_trans;

plot pixel at x,y1 and x,y2

}

clear screen

}


This may not be too exact but I hope you got the idea. There surely must be better ways to do this also.

### #3ramzi085

New Member

• Members
• 12 posts

Posted 08 December 2005 - 05:44 PM

### #4monjardin

Senior Member

• Members
• 1033 posts

Posted 08 December 2005 - 06:01 PM

The book "Physics for Game Developers" from O'Reilly has an example.
Didn't you just post this question a few days ago?
monjardin's JwN Meter (1,2,3,4,5,6):
|----|----|----|----|----|----|----|----|----|----|
*

### #5eddie

Senior Member

• Members
• 751 posts

Posted 08 December 2005 - 06:06 PM

This sounds sneakily like a homework project.

### #6monjardin

Senior Member

• Members
• 1033 posts

Posted 08 December 2005 - 06:13 PM

You aren't the first to think this. He cross posted this question two weeks ago:
monjardin's JwN Meter (1,2,3,4,5,6):
|----|----|----|----|----|----|----|----|----|----|
*

### #7ramzi085

New Member

• Members
• 12 posts

Posted 08 December 2005 - 07:46 PM

### #8Axel

Valued Member

• Members
• 119 posts

Posted 08 December 2005 - 08:56 PM

Don't feed the troll.

### #9eddie

Senior Member

• Members
• 751 posts

Posted 08 December 2005 - 11:49 PM

ramzi085:

You didn't ask a very good question.

If you're looking for the entire thing written out for you, you're going to find it a hard time to get what you're looking for: very few people are going to spoon feed you this.

### #10Goz

Senior Member

• Members
• 575 posts

Posted 09 December 2005 - 09:09 AM

This might help ...

http://www.gamasutra...liveira_pfv.htm

### #11anubis

Senior Member

• Members
• 2225 posts

Posted 09 December 2005 - 05:06 PM

http://nehe.gamedev....n.asp?lesson=11
If Prolog is the answer, what is the question ?

### #12ramzi085

New Member

• Members
• 12 posts

Posted 09 December 2005 - 07:53 PM

eddie i do my best in this project but i dont know how can make the flag seems fly thats all and i need simple code for that in 2d and i will do like it thats all
thanx anyway

### #13eddie

Senior Member

• Members
• 751 posts

Posted 09 December 2005 - 08:16 PM

That's fine ramzi, but you should really learn to ask good questions. Large vague questions are hard to answer, and often frustrate the people on this forum.

If you could limit it a specific area you're having issue with, even if it's, "I have to do x, y, and z, and I'm not sure where to start. Should I do x first? Or y? Or z?". Better yet, if you can experiment some and say, "I've tried x,y,z and I've got it mostly, but I'm really stuck with y. How do I do step 3 in y?".

Those will yield you the best results.

### #14damn

New Member

• Members
• 22 posts

Posted 10 December 2005 - 12:40 PM

ramzi085 said:

Hi everybody,
plz i want a openGL code to make a flag seems fly(flap)
plz its very important...

Hey... Go to nehe.gamedev.net There is a waving flag tutorial there...

### #15kgkg

New Member

• Members
• 8 posts

Posted 27 December 2005 - 07:04 PM

roxtar said:

You could take the flag to be two parallel sine waves which shift their phase a little bit in each frame.

for(phase=0;phase<360;phase++) {

for(theta=0;theta<360;theta++) {

x=(theta+phase)*PI/180;

y1=sin(x);

y2=sin(x)+y_trans;

plot pixel at x,y1 and x,y2

}

clear screen

}


This may not be too exact but I hope you got the idea. There surely must be better ways to do this also.

wht does y_trans refer to???

### #16Reedbeta

DevMaster Staff

• 5306 posts
• LocationBellevue, WA

Posted 27 December 2005 - 10:35 PM

In this case, y_trans is the height of the flag.
reedbeta.com - developer blog, OpenGL demos, and other projects

### #17kgkg

New Member

• Members
• 8 posts

Posted 28 December 2005 - 05:28 AM

Reedbeta said:

In this case, y_trans is the height of the flag.
ok..thnx a lot :yes:

### #18XORcist

Member

• Members
• 39 posts

Posted 03 January 2006 - 04:49 AM

I hope, we are finally done with waving flag thing. :sneaky:

good luck ramzie, kgkg, ... :yes:

#### 1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users