Remove collision from water

client/entity/entity.ts

@@ -1,4 +1,3 @@
-import { AIR } from "$/common/constants.ts";
 import { move_body } from "$/common/physics.ts";
 import type { ClientLevel } from "../level/client_level.ts";
 
@@ -73,7 +72,7 @@ export abstract class Entity {
 
 	// falls and moves by its velocity for one tick, see move_body
 	move() {
-		const collisions = move_body(this, this.gravity, (x, y, z) => this.level.get_block(x, y, z) !== AIR);
+		const collisions = move_body(this, this.gravity, (x, y, z) => this.level.has_collision(x, y, z));
 		this.colliding_x = collisions.x;
 		this.colliding_y = collisions.y;
 		this.colliding_z = collisions.z;

client/level/client_level.ts

@@ -254,6 +254,12 @@ export class ClientLevel {
 		return chunk.blocks[index] & ID_MASK;
 	}
 
+	// whether entities bump into the block there. unloaded chunks count as solid, so nothing falls out of the world
+	has_collision(x: number, y: number, z: number) {
+		const block = this.get_block(x, y, z);
+		return block === VOID || (block !== AIR && (this.#blocks[block]?.has_collision ?? true));
+	}
+
 	// only changes what this client shows, drops and everything else happen on the server
 	break_block(x: number, y: number, z: number) {
 		const block_chunk_x = Math.floor(x / CHUNK_SIZE);