Well, I'm a noob because I can't work this out. But I want to check a block under the point which I'm going to spawn a tree - I only want it to spawn on grass. But it currently spawns everywhere. So my noob request is how can I check if there is grass under the block I'm going to spawn a tree above.

 

Well, if we don't ask we can't learn!

 

(I understand if ya reply with hate v-v)

 

private void GeneratorOverworld(World world, int i, int j, Random rand) {

addOre(AlkiaBlocks.sodalite_ore, net.minecraft.init.Blocks.stone, rand, world, i, j, 10, 45, 4, 10, 20);

 

ChunkGenRand = new Random();

//bracket number div by 100 = spawn chance (testing will be 1)

ChunkGenRandNum = ChunkGenRand.nextInt(1)+1;

 

if(ChunkGenRandNum == 1){

 

for(int k = 0; k<16; k++)

{

int RandPosX = i + rand.nextInt(16);

int RandPosZ = j + rand.nextInt(16);

int j1 = getHeightValue(world, RandPosX, RandPosZ);

BlockPos blockPos1 = new BlockPos(RandPosX, j1, RandPosZ);

//example

if(block == Blocks.grass){

(new WorldGenTree()).generate(world, rand, blockPos1);

}

 

}

}

}

 

Use World#getBlockState to get the IBlockState at a BlockPos and IBlockState#getBlock to get the Block from an IBlockState.

Use something along the lines of

 

if (world.getBlockState(POSITION) == Blocks.grass.getDefaultState()){

 

 

DO STUFF

 

}

 

Where POSITION is the block under your tree.

Use something along the lines of

 

if (world.getBlockState(POSITION) == Blocks.grass.getDefaultState()){

 

 

DO STUFF

 

}

 

Where POSITION is the block under your tree.

No, use

world.getBlockState(BlockPos).getBlock() == Blocks.grass

to check the block type.

Perhaps it doesn't matter here, but I thought it was better to use .equals() for those comparisons instead of ==.

 

In this case given its a static final Item so it probably doesn't matter...