I've been trying in vane to simplify a code of mine to make a certain block spread. Started with basic vanilla grass code, which allowed me to speed up the spreading to see if I coded right, which worked. But I thought about changing it so it wouldn't spread as randomly, but within a flat 3x3 square. I was able to code a working code for that, but no matter what I seem to try it doesn't seem to spread at all. Codes below:

Vanilla's updateTick method:

 

 

 public void updateTick(World p_149674_1_, int p_149674_2_, int p_149674_3_, int p_149674_4_, Random p_149674_5_)
    {
        if (!p_149674_1_.isRemote)
        {
            if (p_149674_1_.getBlockLightValue(p_149674_2_, p_149674_3_ + 1, p_149674_4_) < 4 && p_149674_1_.getBlockLightOpacity(p_149674_2_, p_149674_3_ + 1, p_149674_4_) > 2)
            {
                p_149674_1_.setBlock(p_149674_2_, p_149674_3_, p_149674_4_, Blocks.dirt);
            }
            else if (p_149674_1_.getBlockLightValue(p_149674_2_, p_149674_3_ + 1, p_149674_4_) >= 9)
            {
                for (int l = 0; l < 4; ++l)
                {
                    int i1 = p_149674_2_ + p_149674_5_.nextInt(3) - 1;
                    int j1 = p_149674_3_ + p_149674_5_.nextInt(5) - 3;
                    int k1 = p_149674_4_ + p_149674_5_.nextInt(3) - 1;
                    Block block = p_149674_1_.getBlock(i1, j1 + 1, k1);

                    if (p_149674_1_.getBlock(i1, j1, k1) == Blocks.dirt && p_149674_1_.getBlockMetadata(i1, j1, k1) == 0 && p_149674_1_.getBlockLightValue(i1, j1 + 1, k1) >= 4 && p_149674_1_.getBlockLightOpacity(i1, j1 + 1, k1) <= 2)
                    {
                        p_149674_1_.setBlock(i1, j1, k1, Blocks.grass);
                    }
                }
            }
        }
    }

 

Current modded updateTick method:

 

 public void updateTick(World world, int x, int y, int z, Random random)
    {
        if (!world.isRemote)
        {
        	if (world.getBlockLightValue(x, y + 1, z) < 4 && world.getBlockLightOpacity(x, y + 1, z) > 2)
            {
                world.setBlock(x, y, z, Blocks.dirt);
            }
            else if (world.getBlockLightValue(x, y + 1, z) >= 9)
            {
                for (int l = 0; l < 97; ++l)
                {
                    /*int i1 = x + random.nextInt(3) - 1;
                    int j1 = y + random.nextInt(5) - 3;
                    int k1 = z + random.nextInt(3) - 1;
                    Block block = world.getBlock(i1, j1 + 1, k1); */

                    if (world.getBlock(x + 1, y, z) == Blocks.grass && world.getBlockLightValue(x, y + 1, z) >= 4 && world.getBlockLightOpacity(z, y + 1, z) <= 2)
                    {
                        world.setBlock(x + 1, y, z, Blocks.glass);
                    }
                    if (world.getBlock(x - 1, y, z) == Blocks.grass && world.getBlockLightValue(x, y + 1, z) >= 4 && world.getBlockLightOpacity(z, y + 1, z) <= 2)
                    {
                        world.setBlock(x - 1, y, z, Blocks.glass);
                    }
                    
                    if (world.getBlock(x, y, z + 1) == Blocks.grass && world.getBlockLightValue(x, y + 1, z) >= 4 && world.getBlockLightOpacity(z, y + 1, z) <= 2)
                    {
                        world.setBlock(x, y, z + 1, Blocks.glass);
                    }
                    if (world.getBlock(x, y, z - 1) == Blocks.grass && world.getBlockLightValue(x, y + 1, z) >= 4 && world.getBlockLightOpacity(z, y + 1, z) <= 2)
                    {
                        world.setBlock(x, y, z - 1, Blocks.glass);
                    }
                }
            }
        }
    }

 

And I'm not asking for code, I'm asking for explanation, please help this has been bugging me.

 

What all have you tried? I imagine you've tried everything, because there's not much there to fiddle around with, but maybe there's a clue in the things you have tried.

That piece of code

world.getBlockLightOpacity(z, y + 1, z) <= 2

shouldn't it be

(x, y + 1, z)

?