Hey, I have a custom tnt explosion and I was able to make it destroy a sphere, but I wanted to to only destroy the bottom half of the sphere and then expand from there on up. Here is my code, 

@Override
    public void doExplosionA()
    {
    	
        Set<BlockPos> set = Sets.<BlockPos>newHashSet();
        Set<IBlockState> states = Sets.<IBlockState>newHashSet();
      
       
      
       int blocksDestroyed = 0; 
       int radius = this.size;
       
      

      
      
      
    	   for (int j =  -radius; j < radius; j ++)
        {
            for (int k =  -radius; k <  radius; k ++)
            {
                for (int l = -radius; l <  radius; l ++)
                {
                	
                	
                	double distSq = j * j + k * k + l * l;
                	
                	
                	if(distSq <= (radius * radius)) {
                		
                
                	if(k > 0) {
                		continue;
                	}
                	
                	
                		BlockPos pos = new BlockPos(x + j, y + k, z + l);
                		if(world.getBlockState (pos) != Blocks.BEDROCK.getDefaultState()){
                			if(world.getBlockState(pos) != Blocks.AIR.getDefaultState()) {
                			
                		world.setBlockToAir(pos);
                			 
                		
                			
                				
                				blocksDestroyed++;
                				
                				
                			}
                		
                	
                }
                	
            }

            }
        }
            
        

       }

I have it stop destroying blocks half way up, because thats the point at which I want it to expand.

Any help is appreciated, Thanks

You can either make a better loop, or increment your maxX and maxZ based on Y value

Edited February 6, 20196 yr by Cadiboo