Collision detection in 3D for obstacles, sword fighting...

[Firlefanz]

Nice underwear lol

The guy gets a breast plate armor and trousers, both can be changed, the boots are directly on the mesh and stay. There will be 4 different chars with own textures, special moves and abilities (correct word?).

So one last Question (I hope):
This helped me a lot.
Now it seems to work if I have the monster exactly in front or, and this is the problem exactly in the back :roll:

function TForm1.fightcollide(spriteself: TDJXEngineItem): boolean;
var i: integer;
    colSpr: TDJXEngineItem;
    ColPt: TD3DXVector2;
    tmpVec: TD3DXVector2;
    ndist,nrot:  Double;
    vdir,v: TD3DXVector3;
    d: single;
begin
  result:=false;
  //nrot:=degtorad(spriteself.nrotatey);
  nrot:=spriteself.nrotatey;
  vDir := D3DXVector3(cos(nrot),0,sin(nrot));
  for i:=0 to Engine.Count-1 do begin
    ndist:=distance_dbl(spriteself.x,spriteself.z,0,Engine.Sprites[i].X,Engine.Sprites[i].Z,0);
    if &#40;Engine.Sprites&#91;i&#93;<>spriteself&#41;
    and &#40;ndist<Innomsprite&#40;spriteself&#41;.nRadius*2+Innomsprite&#40;Engine.Sprites&#91;i&#93;&#41;.nRadius*2&#41;
    then begin
      colSpr&#58;=Engine.Sprites&#91;i&#93;;
      //Player hits Monster
      if &#40;spriteself.name='spieler'&#41; and &#40;meshplayer&#40;spriteself&#41;.status=schlag1&#41; then begin
        if &#40;colspr.name='innom'&#41; and &#40;meshinnom&#40;colspr&#41;.status<>schmerz&#41; then begin
      	  D3DXVec3Subtract&#40;v,D3DXVector3&#40;colspr.X,colspr.Y,colspr.Z&#41;,D3DXVector3&#40;spriteself.X,spriteself.Y,spriteself.Z&#41;&#41;;
          D3DXVec3Normalize&#40;vdir, vdir &#41;;
          D3DXVec3Normalize&#40;v,v&#41;;
          d&#58;= &#40;v.x * vdir.x&#41; + &#40;v.z * vdir.z&#41;;
          d &#58;= ArcCos&#40;d&#41;;
          if &#40;d < pi/5&#41; or &#40;d > 5*pi/6&#41; then begin //player is in the front area
            meshinnom&#40;colspr&#41;.nanimpos&#58;=0;
            meshinnom&#40;colspr&#41;.status&#58;=schmerz;
            meshinnom&#40;colspr&#41;.hit&#40;meshplayer&#40;spriteself&#41;.nhitpower&#41;;
          end;
        end;
      end;
    end;
  end;
end;

Disabling html....done :twisted:

Thanks a lot guys, this helps me a lot!

Firle

[Huehnerschaender]

you "forgot" to check if d is greater than 0. only then the monster is in front of you. if d is negative then it is behind you. look at the first sample from grudizio.

greetings,
dirk

[Firlefanz]

Now I got the idea.

This will be very cool for straight hit and 'swinging' hit lol.

Perfect, thanks! (need to write some comments now)

This helped me a lot, great stuff, thank you both :salute:

[grudzio]

Huehnerschaender:

The third step - checking if object is below or above camera wiev should be changed to this

// CameraXAngle is the rotation angle along X axis
oy := v.y*cos(CameraXAngle);
//Pascal does not have tangent function
tan := sin(CameraViewAngle*0.5) / cos(CameraViewAngle*0.5);

if &#40;oy < oz*tan&#41; and &#40;oy > -oz*tan&#41; then
 // object is visible

Now it works if camera looks up or down.

[Huehnerschaender]

Thanks grudzio.

I will try it out as soon as possible.

Btw, my version of pascal (BDS 2005/2006) has a tan function included in math.pas.

Greetings,
Dirk