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I'd like to do some fancy-schmancy redstone shenanigans exploiting the fact that melon blocks growing into a square can hold a charge (and thus complete a circuit). Is the direction they spawn the melon truly random?

I did a small-scale test, and got 3/4 melons spawning in the same direction. I don't want to pronounce Melons to be non-random though, as it's still a very small sample size.

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I'm curious, are you trying to utilize the (possible) randomness or to eliminate it? –  Fambida Oct 4 '11 at 4:44
@Fambida Utilize it. I want to make Schrödinger's Cow. Obviously, if I can't get two equally random possibilities, the cow can't be simultaneously dead and alive. –  Raven Dreamer Oct 4 '11 at 4:54
+1 for Schrödinger's Cow. –  harbichidian Oct 4 '11 at 5:06
@ Raven That's assuming that dead or alive is two separate states instead of a continuum. Assuming that there's a bias towards one direction you could still have a mostly dead somewhat alive cow or a mostly alive somewhat dead cow. Or you could wire the input through multiple potential melons so that the bias is canceled out. –  Fambida Oct 4 '11 at 5:12
So you ban the minecraft-enderman tag, but create the melon-mechanics tag? Care to explain yourself before I cry mod abuse? :P –  John the Green Oct 4 '11 at 16:46
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1 Answer

up vote 7 down vote accepted

I think I found the code that chooses where the melon grows. (All comments added by me.)

int i1 = random.nextInt(4);
int j1 = i;  // Assuming j1 and k1 are the horizontal axes...
int k1 = k;
if(i1 == 0)  // North
if(i1 == 1) // South
if(i1 == 2) // East
if(i1 == 3) // West
    k1++; // or somthing like that, anyway.
if(world.getBlockId(j1, j, k1) == 0 && world.getBlockId(j1, j - 1, k1) == Block.tilledField.blockID)  // Make sure the targeted block is empty and below it is farmland...
    world.setBlockWithNotify(j1, j, k1, field_35297_a.blockID); // Place a melon.

It appears to depend on how random random.nextInt(4) is.

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Excellent sleuthing! This looks like it is random then. Possibly also, you're more likely to grow a melon when you have 4 tilled blocks surrounding it? –  Raven Dreamer Oct 4 '11 at 22:25
Damn. Now I really want to pour through the rest of the Minecraft code. –  Raven Dreamer Oct 4 '11 at 22:38
@Raven Dreamer, what makes you so sure it really is random? 4, 4, 4, 4, 4 ... would be a perfectly valid sequence. –  Cyclops Oct 4 '11 at 22:59
@Cyclops - that's a problem with any program using java's rand library, though. –  Raven Dreamer Oct 4 '11 at 23:12
@RavenDreamer Glad I could help. :) The code appears to select a location, then check if it's tilled, only spawning if it is. So you are more likely to grow a melon if all 4 surrounding tiles are farmland. –  John the Green Oct 4 '11 at 23:17
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