how to make simple disk readers

[Sparky]

hi my name is sparky.i'm relitively new to the forums.
today i will tell you how to make dvd players

1 make a circle
2 put a laser pen on the circle
3 set the fade distanse on the laser so it's just inside the circle
4 change he laser collideSet to 'b'
5 change onlaserhit to (e)=>{e.geom.texture="(name of texure goes here)" }
6 make a white box
7 set the collion to 'b'
8 find away to make the laser touch the box

demo scene here: http://www.algodoo.com/algobox/details.php?id=54469

thanks for looking!~Sparky

[TC42]

3 set the fade distanse on the laser so it's just inside the circle

Nah, just use maxrays=1 and a semi-transparent circle.

[Sparky]

thanks.

[Someone Else]

Interesting concept.

Personally, I would make it print text.

• That is, have a bunch of lasers on the disc.
• In the script menu of the lasers, this code:

• Code: Select all

  {e.geom.color == [0, 0, 0, 1]} ? {e.geom.text = e.geom.text + "Your Text Here"} : {}

• Use a system of mirrors and slots so each laser touches a BLACK box for a very short period of time, in sequence.
• Make the disc rotate slowly, so there is a sufficient amount of time between when a laser hits the box and when the next laser hits it. You decide.

If you use exactly the code I mentioned, each laser should make the box print You Are Here several times. There are ways of making each laser only strike the black box once. For example:

• Make sure NONE of the lasers on the disc are pure blue.
• Make a box. Set the refractive index to the minimum slider value.
• Point a pure blue laser at it. That is, in the script menu, [0, 0, 1, 1].
• In the box goes this code:
  

  Code: Select all

  color = [0.5, 0.5, 0.5, 0];
{e.laser.color != [0, 0, 1, 1]} ? {color = [0.5, 0.5, 0.5, 1]} : {};

• This should allow exactly one blip of a non-blue laser through, printing exactly one block of text on the black box, before blocking the laser.

EDIT: Hmm... I now realize that the code I posted above does not work. However, I can't figure out how to fix it. Hmm...
That is, the code for the blip gate. The text-changing code works.