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Re: Trying to do 3D (THIRD TRY)

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On Tuesday, May 15, 2018 at 10:59:10 AM UTC+5:30, Leonardo Campos wrote:

> Take a look at this code.
> https://jsfiddle.net/lscoder/rcxd8rrc/
> 
> I hope this help.

Bro, thanks a TON for all that - I just spent ANOTHER 2 hours or so experimenting with my code - still not working. In particular, I'm not sure what you're doing here:

function project(point) {
	const [x, y, z] = point;
  const perspective = fl / (fl + z);

  return [x * perspective, y * perspective];
} 


What does the "const [x, y, z] = point;" do? What is z's value after this statement? (I don't know what "const" is, actually...)

Just for simplicity's sake, I was trying without any focal length, in which case it's just a division by z, am I right? Is my code here correct?:



function perspproject(threedpoly) {


for (var i=0; i<3; i++) {


	twodpoly[i].x = (threedpoly[i].x/threedpoly[i].z) ;
	twodpoly[i].y = (threedpoly[i].y/threedpoly[i].z) ;

	}		

}


Also, how do you prevent the division by zero above, if z happens to be zero, ie. the triangle is sitting on the x axis?


Thanks once again for your help.

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Thread

Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-13 12:35 -0700
  Re: Trying to do 3D (THIRD TRY) Leonardo Campos <leonardoscampos@gmail.com> - 2018-05-14 22:29 -0700
    Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-15 08:15 -0700
      Re: Trying to do 3D (THIRD TRY) Leonardo Campos <leonardoscampos@gmail.com> - 2018-05-15 18:10 -0700
        Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 05:23 -0700
          Re: Trying to do 3D (THIRD TRY) Leonardo Campos <leonardoscampos@gmail.com> - 2018-05-16 21:38 -0700
            Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 23:18 -0700
              Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 23:47 -0700
                Re: Trying to do 3D (THIRD TRY) Leonardo Campos <leonardoscampos@gmail.com> - 2018-05-17 01:03 -0700
              Re: Trying to do 3D (THIRD TRY) Leonardo Campos <leonardoscampos@gmail.com> - 2018-05-17 00:56 -0700
  Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-15 10:48 -0700
  Re: Trying to do 3D (THIRD TRY) "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-05-15 12:48 -0700
    Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 05:29 -0700
  Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 05:27 -0700
    Re: Trying to do 3D (THIRD TRY) "Christoph M. Becker" <cmbecker69@arcor.de> - 2018-05-16 23:31 +0200
      Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-16 21:11 -0700
        Re: Trying to do 3D (THIRD TRY) "Christoph M. Becker" <cmbecker69@arcor.de> - 2018-05-17 13:35 +0200
  Re: Trying to do 3D (THIRD TRY) bit-naughty@hotmail.com - 2018-05-22 05:57 -0700
    Re: Trying to do 3D (THIRD TRY) "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-05-22 13:50 -0700

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