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Why can I add, but not subtract?

Asked by

10 years ago

So I'm working with a point light, and I'm trying to get a glowing effect that gradually changes from one color to another.

01light = script.Parent;
02r =0-- math.random (0,255)
03g = 0--math.random (0,255)
04b = 255--math.random (0,255)
05colors = {r,g,b}
06 
07function UpdateColor ()
08    light.Color = Color3.new (r/255,g/255,b/255)
09    wait (.1)
10end
11 
12while wait () do
13    print 'stage 1'
14        for i = 0,50-r do
15            if r < 255 then
16                r = r + 5;
17                UpdateColor () -- fades to purple, this is where the color is 255,0,255
18            else r = 0;
19                UpdateColor ()
20            end
21        end
22    print 'stage 2'
23        for i = 0,50-b do -- 50 is one less than 255/5.
24            if b > 0 then
25                b = b - 5; -- this is why I divide it by 5
26                UpdateColor () -- fades to red, this doesn't work! Right now the color is still 255,0,255
27            else b = 255;
28                UpdateColor ()
29            end
30        end
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