[1.15.2] Rendering multiple fake blocks culls faces that are only hidden on one fake block

[T-Dark_]

I'm trying to render a fake block as a sort of "targeting preview" for using a certain item. The block should eventually be drawn at where the player is looking at (which can be really far), but for now I'm just trying to understand how rendering works on a basic level.

To be entirely honest, I don't fully understand the code that I'm using yet. I've copy-pasted it from another question and am now messing around to see which things do what. That being said, I'm seeing a weird piece of behaviour and am stumped.

I'm rendering two "fake" blocks, and they seem to work just fine. That is, until I place a block near one of them. Logically, the face that cannot be seen (there is a block in the way, after all), disappears. However, the same face disappears on the other fake block as well.

 

My code is here: https://github.com/T-Dark0/modding-tutorial/blob/master/src/main/java/com/tdark/mymod/rendering/Rendering.java

 

Why does this happen?

[DavidM]

Try not using the same block state for rendering multiple blocks. Create a new one (via getDefaultState) each time.

Edited July 9, 2020 by DavidM

[T-Dark_]

8 minutes ago, DavidM said:

Try not using the same block state for rendering multiple blocks. Create a new one (via getDefaultState) each time.

You mean like

        BlockState blockState1 = Blocks.OBSIDIAN.getDefaultState();
        BlockState blockState2 = Blocks.OBSIDIAN.getDefaultState(); 

and then the two calls to renderBlock are identical except one gets blockState1 and the other gets blockState2?

Isn't that the same blockstate anyway?

(Even if it isn't, tried that, doesn't work. The problem remains)

[TheGreyGhost]

Howdy

the block renderer uses the BlockPos to check the adjacent blocks to see if any are blocking out the faces

eg if there is a full solid block to the EAST of your block, then the renderer doesn't draw the EAST face.

You appear to use the same dummy BlockPos for both blocks, so if the EAST face is hidden for that blockpos (because there is a solid block to the EAST), then the EAST face is always hidden, regardless of where you have told the renderer to draw your block by translating the render.

 

-TGG

 

 

 

 

 

 

 

 

[T-Dark_]

That was it. Thanks a lot!

[DavidM]

17 hours ago, T-Dark_ said:

You mean like

        BlockState blockState1 = Blocks.OBSIDIAN.getDefaultState();
        BlockState blockState2 = Blocks.OBSIDIAN.getDefaultState(); 

and then the two calls to renderBlock are identical except one gets blockState1 and the other gets blockState2?

Isn't that the same blockstate anyway?

(Even if it isn't, tried that, doesn't work. The problem remains)

Ah my bad, I was thinking about mutable block states from Spigot.