Adding spread to a projectile

[ThinkInvisible]

'matrixMulVector'
'vectorCross'
'vectorDot'
'vectorOrthoBasis'

What the heck do these do? I was messing around with vectors and found these.

Also:
      for(%i=0;%i<%num;%i++) {
         %r = 6.28318530;
         %nvel = %vel;
         %theta = mcos(getrandom(0, 1000)/1000 * %r);
         %pitch = msin(getrandom(0, 1000)/1000 * %r);
         %theta -= %pitch;
         %sx = %spread * %theta;
         %sy = %spread * msin(macos(%theta));
         %sz = %spread * %pitch;
         %nvel = vectorAdd(%nvel, %sx SPC %sy SPC %sz);
         %obj.spawnProjectile(%proj,%nvel,%scale,%slot);
      }
I assume i'm either doing something very wrong here or there's a much better way to do this.
Or both.

(all variables have been defined already if they're not defined here)

[Ad Bot]

[Treynolds416]

It's not something that can be explained in depth easily without a basic grounding in trig
They're all math equations, and all this code is doing is transforming a given maximum angle of variance into a three-component vector for the engine to use

[ThinkInvisible]

It's not something that can be explained in depth easily without a basic grounding in trig
They're all math equations, and all this code is doing is transforming a given maximum angle of variance into a three-component vector for the engine to use

I had it solved once, I just forgot how to do it. :/

[Port]

If you're satisfied with the travel velocity of the projectiles changing slightly, you can simply generate a random vector and add that to the original velocity. That seems to work really well for me.

[ThinkInvisible]

If you're satisfied with the travel velocity of the projectiles changing slightly, you can simply generate a random vector and add that to the original velocity. That seems to work really well for me.

I'll use that for now, but I still want to remember how to convert vectors like that. The main problem with plain getRandom is that it makes a square spread area instead of a circle.

What type of gun fires bullets in a square pattern? >:V

[Treynolds416]

What you want for this is for getRandom to generate random degrees, not random vector components

[Ipquarx]

Here's a explination of Treynolds post:


...

In other words, calculate a random left and up angle, and then adjust the vector based on the equation original/cos(offset)

[ThinkInvisible]

   %theta = getrandom(0, 90);
   %pitch = getrandom(0, 90);
   %nvel = vectorAdd(%nvel, 2 * mcos(%theta) SPC 2 * msin(%theta) SPC 2 * mcos(%pitch));

seems to work perfectly
thanks

[Destiny/Zack0Wack0]

Just so you know, the trigonometric functions in TorqueScript take radians.