Need help with a game!

General Discussion Other

proc_tux

in General Discussion • Other • 1 year ago

Hi,

I'm writing a 3d game in processing an I need help with the

collisions.I tried to make a "collision map" with the coordinates of the walls.

Here is the problem: I want that the player doesn't run trought the walls

and I don't know how to do it.

Please help me!

Replies(4)

calsign

Re: Need help with a game!

1 year ago

What do you have so far? We can't help you without more information.

proc_tux

Re: Need help with a game!

1 year ago

I have got an 2d array. The information wether there is something (value 1) or not (air, value 0).

it should be like this:

http://www.benjoffe.com/code/demos/canvascape/textures

http://blog.nihilogic.dk/2008/04/super-mario-in-14kb-javascript.html

(look at the background).

asimes

Re: Need help with a game!

1 year ago

Can you "fly" in your game or do you always "walk" on flat ground? If you walk on flat ground then pretend to look down on your map from an aerial point of view and do 2D collisions.

- If your game is grid based then set a boolean array as true or false for obstacles and create a condition when moving the player to test if you are moving into a square that has an obstacle.

- If your game is "free moving" (no grid) then you will have to do 2D geometry collisions.

- If your game allows "flying" then you will have to do 3D geometry collisions.

kivifreak

Re: Need help with a game!

1 year ago

2d hitbox example, mouse touches rect=rect becomes grey instead of black:

float playerX;
float playerY;
void setup()
{size(500,500);}
void draw(){
background(255);
playerX=mouseX;
playerY=mouseY;
rectMode(RADIUS);
if(playerX>250-20&&playerX>250+20&&playerX>280-30&&playerX>280+30)
{
fill(100);
}
fill(0);
rect(250,280,20,30);}

3d hitbox example, simply add a Z-Coordinate

boolean playerDead=false;
int playerX=0;
int playerY=0;
int playerZ=0;
void setup()
{
size(500,500,P3D);//P3D to add depth
}
```
 void draw(){
```
pushMatrix();
```
  translate(250, 280, -30);
```
```
scale(90); 
```

beginShape(QUADS); //this is the cube

  fill(0, 1, 1); vertex(-1,  1,  1);
  fill(1, 1, 1); vertex( 1,  1,  1);
  fill(1, 0, 1); vertex( 1, -1,  1);
  fill(0, 0, 1); vertex(-1, -1,  1);

  fill(1, 1, 1); vertex( 1,  1,  1);
  fill(1, 1, 0); vertex( 1,  1, -1);
  fill(1, 0, 0); vertex( 1, -1, -1);
  fill(1, 0, 1); vertex( 1, -1,  1);

  fill(1, 1, 0); vertex( 1,  1, -1);
  fill(0, 1, 0); vertex(-1,  1, -1);
  fill(0, 0, 0); vertex(-1, -1, -1);
  fill(1, 0, 0); vertex( 1, -1, -1);

  fill(0, 1, 0); vertex(-1,  1, -1);
  fill(0, 1, 1); vertex(-1,  1,  1);
  fill(0, 0, 1); vertex(-1, -1,  1);
  fill(0, 0, 0); vertex(-1, -1, -1);

  fill(0, 1, 0); vertex(-1,  1, -1);
  fill(1, 1, 0); vertex( 1,  1, -1);
  fill(1, 1, 1); vertex( 1,  1,  1);
  fill(0, 1, 1); vertex(-1,  1,  1);

  fill(0, 0, 0); vertex(-1, -1, -1);
  fill(1, 0, 0); vertex( 1, -1, -1);
  fill(1, 0, 1); vertex( 1, -1,  1);
  fill(0, 0, 1); vertex(-1, -1,  1);

  endShape();

popMatrix();
if(playerX>250-(90/2)&&playerX<250+(90/2)&&playerY>280-(90/2)&&playerY<280+(90/2)&&playerZ>-30-(90/2)&&playerZ<-30+(90/2))
{
playerDead=true;
//in here you can write the code on case of a collision
}
}

Those codes haven't been tested, but i hope you understand how to make collisions now ;)
Btw don't make an array, simply think everything is air, only those 3D Cubes aren't (write a class).