Changing color of a light randomly with expressions

[Dan Ebberts]

In expressions, color is represented as an array of [red,green,blue,alpha] where the values have to be between 0 and 1. (Leave the alpha value set to 1 – it doesn’t do anything but it has to be there. So this would be one way to change the color at random every half second:

period = 0.5; // change color every .5 seconds
colors = [[1,0,0,1], // red
          [0,1,0,1], // green
          [0,0,1,1], // blue
          [1,0,1,1], // magenta
          [1,1,0,1], // yellow
          [0,1,1,1]] // cyan

seed = Math.floor(time/period);
seedRandom(seed,true);
idx = Math.floor(random(colors.length));
colors[idx]

Dan

[Helgi Johannsson]

Thank you very much Dan, you are incredible 🙂

[Steve Gerges]

Hi i just searched for something like this and stumbled upon this old thread. It’s almost what i would like to achieve….but…. 😉

in this case the colors jumps straight from one color to another, as i am looking for a smooth transition between a given set of colors, and additionaly a little bit of random.

i’m using it on lights that drive a particular and would like to have some minor variations of the color (l’ets say i’m using some kind of green i don’t want to have the same green all the way)

is this possible ?

[Elizabeth Yorick]

Thank you for posting this!! This is exactly what I needed!!