Jump to content

structure spawning on air


Recommended Posts

  • 2 weeks later...

I'm figuring out structures atm myself. You have to check that the terrain elevation is within an allowed range. If you look at the minecraft source you'll find the code to do this.


Call a surface height range checker during the canBeGenerated method of your structure class:


protected boolean surfaceCheck(@Nonnull ChunkGenerator<?> chunkGenerator, int chunkX, int chunkZ)
        int offset = getSize() * 16;
        int xStart = (chunkX << 4);
        int zStart = (chunkZ << 4);

        int c1 = chunkGenerator.func_222531_c(xStart, zStart, Heightmap.Type.WORLD_SURFACE_WG);
        int c2 = chunkGenerator.func_222531_c(xStart, zStart + offset, Heightmap.Type.WORLD_SURFACE_WG);
        int c3 = chunkGenerator.func_222531_c(xStart + offset, zStart, Heightmap.Type.WORLD_SURFACE_WG);
        int c4 = chunkGenerator.func_222531_c(xStart + offset, zStart + offset, Heightmap.Type.WORLD_SURFACE_WG);

        int lowerHeight = Math.min(Math.min(c1, c2), Math.min(c3, c4));
        int upperHeight = Math.max(Math.max(c1, c2), Math.max(c3, c4));

        LOGGER.info("Area Height Range" + lowerHeight + " to " + upperHeight);

        boolean isFlat = Math.abs(upperHeight - lowerHeight) <= getHeightDelta(); 
  // getHeightDelta() should just return the maximum elevation change you want to allow your structure to generate on (this can be a property at the top of the class and set on a per-structure basis). A value of 3 will allow for your structure to generate over a 3 block elevation change, lower numbers require flatter terrain but will (depending on the size of your structure) reduce the opportunities for the structure to spawn.

        return isFlat;



Call it something like this:

In canBeGenerated method:

if (surfaceCheck(chunkGenerator, chunkX, chunkZ))
   ... Continue with other checks



The other option, which I'm trying to figure out, is generating blocks underneath the structure if they are air or water (which Minecraft does for certain structures). Not that I have figured out how to implement that.

Edited by FizixRichard
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.