feat: Entity Observer (new primitive)

[lammmab]

Introducing: Entity Observer

What is it?

The Entity Observer is a new block primitive, akin to the Smart Observer that can detect specifically entities. It works through a simple AABB check, and triggers when an entity is detected sitting directly in front of it.

What does it solve?

In Create, there's seemingly no good way to fire a signal when a dropped item, shot arrow, etc. is facing a Smart Observer. This addresses that in the form of a new block; rather than extending the functionality of a Smart Observer (which is one option, but this may be better for clarity). Some viable uses:

• A fan washing system where, once the item is washed, the entity observer detects it via. a filter and opens a trapdoor allowing the items to continue through
• An "alarm" system that detects when players enter and fires a signal
• Any system where detecting dropped entities, mobs, etc. are standing in front of the block is useful

Key Features

• Fires for ANY entity when not explicitly filtering
• Works for any Entity: dropped items, blocks, players standing in front of it, chickens, cows, whatever

Undetermined / TODO

• How to filter for specific players or mobs (the big one)
• The texturing - should it be changed?
• The recipe
• Filtering for items (e.g. boat, specific arrows) should match when those entities are in the block range (Unsure how to go about this)
• Needs pondering scenes made - once everything is determined

Showcase

2026-07-19.14-28-46.mp4