Description
I encountered unexpected behavior when testing the "looking_at" predicate using the command /execute if predicate test:test (with the attached map with datapack).
Observed behavior
If I could see the target entity’s eyes (the EyePos point, not the eye on the texture), even if I was looking at the entity through a solid block, the “look_at” test passed (IMG1).
However, if I couldn’t see the entity’s eyes, even if I was looking at the entity, the test failed (IMG2).
Expected behavior
The "look_at" test should only pass when the player directly looks at the target entity without obstructions.
Steps to reproduce
Download the attached map with datapack.
Launch the game and play the map.
Execute
/execute if predicate test:testin the above situations.
Additional information
The bug might affect all versions since "look_at" is added to the game (Tested on 1.20.1).
I believe this issue may be related to how Minecraft determines whether an entity is visible (not blocked by blocks, etc.). Minecraft’s raycast can only detect one type of collision (entity or block) at a time. So, the game must first run an entity collision test and then a block collision test, which uses a strange method to detect blocks (it simply detects block collisions on the line between the player’s eye position and the target entity’s eye position!
Linked issues
Attachments
Comments 2
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(Going off the screenshots shown) The blue line is not the eye point used to calculate if the entity has visibility to you. The entity and player must both be able to see the red lines shown on the entity hitbox, as that is the true 'eye level' / point of visibility for an entity. That's why the test shown in IMG2 failed.