Public Group

## Recommended Posts

This code is from a simple 3D race car game.  When the line : if (I == 400)...  is altered the value is for changing a single house near the road in the x direction.  I was wondering if someone could tell me how this code works.  Mostly, what does line  do and what on earth is i about?  Are these lines of pixels?

EDIT : The screen dimensions are : 1024 x 768  and the world is larger, mainly horizontally.

    std::vector<Line> lines;

for(int i=0;i<1600;i++)
{
Line line;
line.z = i*segL;

if (i>300 && i<700) line.curve=0.5;
if (i>1100) line.curve=-0.7;

if (i<300 && i%20==0) {line.spriteX=-2.5; line.sprite=object[5];}
if (i%17==0)          {line.spriteX=2.0; line.sprite=object[6];}
if (i>300 && i%20==0) {line.spriteX=-0.7; line.sprite=object[4];}
if (i>800 && i%20==0) {line.spriteX=-1.2; line.sprite=object[1];}
if (i==400)           {line.spriteX=-1.2; line.sprite=object[7];}

if (i>750) line.y = sin(i/30.0)*1500;

lines.push_back(line);
}

Also, if there is anything else interesting I'd like to here it

Thanks so much,

Josheir

P.S. Is this a beginner's question?

Edited by Josheir

##### Share on other sites
5 hours ago, Josheir said:

Mostly, what does line  do and what on earth is i about?  Are these lines of pixels?

What kind of "3D" does this game show? It remembers me of a method of making racing car games that was popular in the era before GPUs. There is this excellent article that explains the technique in great depth. However, the code snippet alone shows little context, so I may be wrong though.

If that technique is used here, then the shown code snippet creates the track in advance. That "line.curve = ..." stuff could be the offset that causes the visual bending of the road when rendered. And that "line.sprite ..." stuff looks like placing billboards to decorate the track to its left and right.

##### Share on other sites

Thank you for the link haegarr, the code is indeed this sort of game.  I'm having a fun time with the code being so succinct.  I don't know when I'll return to looking at the code, although I will probably have more questions.

Sincerely,

Josheir

1. 1
Rutin
32
2. 2
3. 3
4. 4
5. 5

• 12
• 9
• 9
• 9
• 14
• ### Forum Statistics

• Total Topics
633315
• Total Posts
3011328
• ### Who's Online (See full list)

There are no registered users currently online

×