Add a default size

Author: D8H

extensions/reviewed/ParticleEmitter3D.json

@@ -6995,6 +6995,15 @@
                 "",
                 "/** @type {gdjs.CustomRuntimeObject} */",
                 "const object = objects[0];",
+                "// Force the size of the object because it doesn't contain any instance.",
+                "object._innerArea = {",
+                "      min: [-16, -16, -16],",
+                "      max: [16, 16, 16],",
+                "    };",
+                "const hitbox = new gdjs.Polygon();",
+                "hitbox.vertices = [[-16, -16], [16, -16], [16, 16], [-16, 16]];",
+                "object._untransformedHitBoxes = [hitbox];",
+                "object._updateUntransformedHitBoxes = () => {};",
                 "",
                 "// Here runtimeScene is the gdjs.CustomRuntimeObjectInstanceContainer inside the custom object.",
                 "const gameScene = object.getRuntimeScene();",