Bed preview displays incorrectly

[WenXin20]

Minecraft 1.15.2 Forge v31.1.39 Placement Preview v1.1.0

When placing a bed, the preview always faces the same direction, no matter which direction the player is facing.

Some other blocks, like double tall grass, doesn't preview the top state, only the bottom. Same with some modded blocks.

[3TUSK]

Known issue. Uncertain about the fix so I didn't make an issue ticket on my own.

Technical details about what I have known so far (checked means addressed):

• [ ] Blocks like bed, chest and shulker box are TileEntityRender which require more context to be correctly rendered.
• [ ] Blocks like tall grass, double flower, doors will place the other half after you place the block. This is hard to predicate.
• [ ] Blocks like lily pad does not have a corresponding BlockItem. Lily pad are placed on water, but water is NOT a block anymore.
• [x] Blocks like grass block has random model. TODO: Feed IBakedModel.getQuad a proper Random with seed from MathHelper.getCoordinateRandom.
• [x] Blocks like flower and bamboo are affected by BlockState.getOffsetType and BlockState.getOffset.
• [x] Blocks like enchantment table and bell have hybrid rendering (static model + TileEntityRenderer.

I did investigate into it a bit, but the only solution I have so far is way too massive and hacky. I won't go in depth about its details here.

[WenXin20]

Ah, it's not a big deal for me if nothing can be done.

For the flowers though, I don't believe it's completely random. Placing the any flower on the same block always gives it the same offset.

[3TUSK]

It is random in terms of different location, statistically.

[3TUSK]

@WenXin20 So I spent couple of hours to make some blocks works. New release has been on CurseForge. Notably:

• Previews of 1-block tall flowers, bamboo, grass, etc. now respect the random offset.
• Bells will have the bell itself rendered, comparing with just the bell stand in previous version. Similarly, Enchantment Table will have the book being rendered (closed only).
• This one is hard to notice: blocks with random model, e.g. grass block and netherrack now have correct preview with the randomness respected.

Things still not working:

• Chests and beds lost their preview due to this attempt.

• Lily pad. Only works if you do something like this, or on ice block: Notice the random orientation is correctly handled.

• Anything that will expand to more blocks after being placed.