#GAMEMAKER STUDIO 2 TILEMAP COLLISION HOW TO#
#GAMEMAKER STUDIO 2 TILEMAP COLLISION CODE#

#GAMEMAKER STUDIO 2 TILEMAP COLLISION CODE#

What does that mean? Well, the first part of the code is what checks for collision groups. Return (maskBitsA & categoryBitsB) & (categoryBitsA & maskBitsB) If (groupIndex is negative) return false

If (groupIndex is same for both fixtures) At the lowest engine level the decision as to whether or not two objects can collide is controlled by the following pseudo code: // check group index Note: You are not limited to 32 collisions in your whole game, only on a per-room basis! How Collisions Are Calculatedīox2D has two methods for determining whether or not collisions can occur – via grouping or through collision bits and mask bits. Consider using parenting to reduce collision overheads where possible.' 'Unable to assign a collision category for object.

#GAMEMAKER STUDIO 2 TILEMAP COLLISION HOW TO#

For this reason it is important that you understand how to limit these base collisions in GameMaker:Studio using parents as a an unoptimised game may eventually give you the following error: Why is this important? Well, collisions are 'expensive', in that they require extra processing by the game engine to resolve, and, due to the way Box2D is designed, you are also limited to how many different base instances can collide in a given room, which by default is 32 (see note below). However one of the things that these resources don't explain is collision filtering and how best to optimise collisions when making a game. Overviewīasic physics can be set up easily in GameMaker:Studio, and the program itself comes with a basic tutorial, an advanced joints demo and a game demo ( Angry Cats), all of which are designed to help you get the most out of the engine.

The file can be loaded into GameMaker:Studio from the start-up screen by selecting Import and browsing to where you have saved the gmz. You can download an example file made for this tutorial by clicking this link: Collision Mask Example. The engine itself is based on the Box2D open source physics library, and you can find further information about the base level structure of the engine from the Box2D manual, although not all the functions have been implemented in the GameMaker Language. This tutorial explains a bit about the physics engine included with GameMaker:Studio, specifically how collisions are dealt with.

Gamemaker studio 2 tilemap collision