Make a block only collidable for a specific entity

[MosquitoFRA]

Hello everyone. Here is my issue: I don't know how to make a bloc only collidable for players. Arrows can cross it which is very annoying because I want to make a shield which stop projectiles and not players. Any help would be great.

[MosquitoFRA]

Do you mean like this?

@Override
public void addCollisionBoxTo List(IBlockState state, World world, BlockPos pos, entity.projectiles)

[MosquitoFRA]

In fact, I'm not used to this method. I found an example:

public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, @Nullable Entity entityIn) {
        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, under);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, middle);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, top);
    }

 

So what do I have to do with these information?

[MosquitoFRA]

I replace "entityIn" by "tileEntity" or "entityProjectiles"?

[MosquitoFRA]

public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, @Nullable Entity entityIn) 

 

     if(entity.projectiles)
    

Edited November 3, 2018 by MosquitoFRA

[MosquitoFRA]

Sorry, I was editing. I don't know why there is @Nullable Entity entityIn?

[MosquitoFRA]

public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, @Nullable Entity entityIn)

     if(entity.projectiles)

    {   super.addCollisionBoxToList(pos, entityBox, collidingBoxes, under);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, middle);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, top);
    }

Is it like this?

[MosquitoFRA]

For the entity, it's entityLiving (I think it's for projectiles).
And I don't know to do this null check

     { if(EntityLiving)

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, under);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, middle);

        super.addCollisionBoxToList(pos, entityBox, collidingBoxes, top);
    }

 

Edited November 4, 2018 by MosquitoFRA

[MosquitoFRA]

Could you correct it, please ... I didn't find an answer anywhere on google and i tried javadoc but didn't know where to go to find the good method.

[MosquitoFRA]

I have to leave. Thank you for your help and patience.

[JimiIT92]

What diesieben was trying to say is that you should learn how to check if an entity is of a given instance or has some particular properties defined in the entity class. I'm pretty sure that the entity class itself has no "projectiles" property, and even if it does i don't think it's a boolean by the name. That being said, you should do something like this (assuming you are using Forge 1.12.2)

 

@Override
public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
  if(entityIn instanceof EntityPlayer) {
    // Do stuff
  }
}

 

In this case you check if the entity that collides with the block is a player. If so then you can do whatever you want (like adding the collision box). 

[Daeruin]

@MosquitoFRA there are hundreds of resources to help you learn basic Java online. I started with Codecademy. Please run through some basic Java tutorials or courses before you keep trying to make mods. You are setting yourself up for constant frustration and failure until you learn more Java.

[MosquitoFRA]

Huge thanks @JimiIT92. I will try.
And finally decided to look at some videos.

[larsgerrits]

On 11/4/2018 at 5:29 PM, JimiIT92 said:

...

@Override
public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
  if(entityIn instanceof EntityPlayer) {
    // Do stuff
  }
}

...

And now you've just give him the code which he can copy-paste without learning anything from it.

[MosquitoFRA]

@Override
          public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
               if(entityIn instanceof EntityPlayer) {
                         public AxisAlignedBB getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
               return new AxisAlignedBB(0.0D, 0.0D, 0.0D, 1.0D, 1.0D, 1.0D);
                    }
               }
          }

I have this but it doesn't work

Edited November 5, 2018 by MosquitoFRA

[Cadiboo]

Learn java. Just the basics, 5 minutes of learning java and you will understand how horribly wrong that is on every level

[MosquitoFRA]

@Override
          public void addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
               if(entityIn instanceof EntityPlayer) {
                         getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
               return new AxisAlignedBB(0.0D, 0.0D, 0.0D, 1.0D, 1.0D, 1.0D);
                    }
               }
          }

I tried this but it didn't work

[larsgerrits]

Learn Java.

Learn Java.

Learn Java.

 

Learn Java.

Edited November 5, 2018 by larsgerrits

[Cadiboo]

Ok, do you know what a method is?

right now your trying to define a method inside another method. This will never* work. I see you tried to fix your issue by removing “public AxisAlignedBB”, but your still trying to define a method inside a method, you’ve just now mangled the inner method. What you need to do where your trying to define the second (where your sure the entity is a player) method is run some code adding custom bounding boxes (look at fences), and otherwise (if the entity is not a player) call super (or run other logic).

 

 

*unless your instantiating an anonymous class (which you won’t learn about for a long time and may never need)

[Cadiboo]

This has been said before “these formums are not a java tutorial”. Feel free to pm me on Discord (Cadiboo#8887) if you want help with this though

[MosquitoFRA]

Sorry, but I don't have Discord.

          @Override
          class collisionBox {
               public AxisAlignedBB addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
                    if(entityIn instanceof EntityPlayer) {
                         class boundingBox {
                              void getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
                                   return super.AxisAlignedBB[](0.0D, 0.0D, 0.0D, 1.0D, 1.0D, 1.0D);
                              }
                         } 
                    }
               }
          }

I tried to correct the code as best as I could and search again on Google, but I can't figure it out.

[Animefan8888]

56 minutes ago, MosquitoFRA said:

Sorry, but I don't have Discord.

          @Override
          class collisionBox {
               public AxisAlignedBB addCollisionBoxToList(IBlockState state, World worldIn, BlockPos pos, AxisAlignedBB entityBox, List<AxisAlignedBB> collidingBoxes, Entity entityIn, boolean isActualState) {
                    if(entityIn instanceof EntityPlayer) {
                         class boundingBox {
                              void getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
                                   return super.AxisAlignedBB[](0.0D, 0.0D, 0.0D, 1.0D, 1.0D, 1.0D);
                              }
                         } 
                    }
               }
          }

I tried to correct the code as best as I could and search again on Google, but I can't figure it out.

Please, just go learn Java first. You have absolutely no idea what you are doing. That code won't even compile your IDE should be yelling its head off at you. 

[Cadiboo]

1 hour ago, Animefan8888 said:

go learn Java

 

On 11/6/2018 at 12:54 PM, Cadiboo said:

these formums are not a java tutorial

As I said though you can pm me for some help

[MosquitoFRA]

Sorry @Cadiboo, but I told that I haven't Discord presviously. But I found how to pm you on this forum.

[Cadiboo]

I recommended discord because it

- doesn’t have a 1 minute delay between messages

- is something pretty much every gamer/programmer has