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How does an object work in GameMaker Studio?
An object can contain a number of different Events and in each event you can use either GML code or D’n’D to define behaviours for that object. However, this object is not placed into the game, but rather acts as a template for instances which are placed into rooms.
How to check if instance is a given object?
Instances of all three types of objects exists in the room and call the same script: scr_test. Inside of this script, how can I check instance of which object is calling it? This read only variable returns the index of the object that the instance has been created from. if (object_index == obj_square) { //
What happens if there are no instances of an object?
If no instances of the object exist, the function will return the keyword noone, but if there are instances then it will return the id of the instance found. Please note that if the instance running the code was created as an instance of the object being checked, then it will be included in the check.
How to check if an instance exists in a room?
You can also use the keyword all to iterate through all the instances in a room, as well as a parent object to iterate through all the instances that are part of that parent / child hierarchy and you can even specify an instance itself (if you have its id) as a check to see if it actually exists in the current room.
Why are Game Maker objects not spawning on top of one another?
This method is not efficient if you expect that most space will be taken, and it can fail while there is actually still room available (also more likely if there are already many instances blocking the way), if this is a problem you need a more elaborate system.
How do you change a variable in GameMaker?
Thankfully the GameMaker Language comes equipped with mechanisms to achieve this. One of the most common methods for accessing or changing a variable in another instance is to use its object name as an identifier and then use a point “.” to tell GameMaker that the variable used after is to be assigned or changed in that object.
Why is there a tries limit in Game Maker?
The “tries” limit is meant to prevent running into an infinite loop if no space is available.