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Game Maker Physics Collision
Game Maker Physics Engine
Game Maker Physics Collision

Today's tech blog takes form of a mini-tutorial, where we will be making a small physics simulation and at the same time we'll discuss some of the issues that people come up against when transitioning from the 'traditional' GameMaker Studio 2 approach to movement and collisions to the physics approach.

Game Maker logic is event driven, so you have to tie actions to different events like collisions, timers, clicks, etc. All we want to do for our Brick is check the “Solid” checkbox on the left. This is for stationary objects involved in the Game Maker physics stuff. You can create a physical 2D level. You can do this with the help of chains that you can make absolutely any form. You can test your level by controlling the ball that works in accordance with the laws of physics. You can make the ball shoot by simply tapping the screen. You can put bricks that also follow the laws of physics.

Even the most advanced users can be confused when using GameMaker Studio 2 physics for the first time, so we'll start this tutorial with probably the most important piece of advice we can give.. Forget everything you know about how GameMaker Studio 2 deals with collisions and movement! Why? Well, when you enable physics in a room, you are changing how everything will interact at a very basic level within GameMaker, and this makes the built in variables like speed and direction obsolete. However, it does enable a whole bunch of specific physics variables which can be used instead.

Posted on May 9, 2019 Full size 667 × 323 Post navigation. Published in physics. The previous game maker 8 had excellent examples, I remember it involved adding hinge joints, rail joints and motor force to them. The built-in physics system still has several types of joints, so you should be able to apply the thinking behind the original system to the new engine even without an copypasteable example. Physics provides a wonderful means for allowing a player to immerse themselves within a game. It makes sense that a mastery of a physics engine would be a powerful asset for any programmer to have at their disposal. Optimizations and specializations can be made at any time due to a deep understanding of the inner workings of the physics engine.

Game maker physics collision not working

The other major change that happens when you enable physics is that collisions will be handled automatically for you. With 'traditional' GameMaker collisions you would have a Collision Event and then have some code or action in there to deal with what happens, but - with the physics enabled - the collisions will be resolved by GameMaker automatically, with bounce angles and velocities etc.. being calculated and applied for you.

So, with that warning out of the way, lets move on and get started making a simple physics simulation.. You'll need to make a new GML project in GameMaker Studio 2 and open the Room Editor before continuing.

To enable physics, you must first set up the physics world. This is done in the room editor, from the physics tab:

Obviously we need to tick the option Enable Physics (otherwise any physics enabled objects placed in the room will cause errors), and then we can set the gravity and the scale for the room. The room Gravity is calculated as a vector, with the distance and the direction of the vector giving the gravity strength in meters per second and the direction of the gravity pull.

The scale option Pixels to Meters isn't quite so obvious. In the physics simulation, all reactions are based off of idealised 'real life' physics, and so the scale of the interaction is important. A 1m cube of lead will not react the same as a 1cm cube of lead, and so we need to let the physics simulation know what scale we are working with. So, here you set how many meters one pixel in the game relates to.

For simplicity we'll leave the default values for this tab and you can close the room editor for now. We'll now need to quickly make some sprites to use for this project. You'll need two block sprites (one for the floor and one to be, well, a block), a circle sprite and a triangle sprite, and make sure to center their origins. They could be any size you want, but for the sake of consistency, keep them around the 32x32px size, as that's what was used to make the Demo file available at the end of this article.

We need to define our objects now, starting with a couple of parent objects. These parent objects won't have any physics properties themselves, and will only be used to 'group' collisions together for ease of use. Now, as we stated at the start of this article, with physics enabled objects will react to collisions automatically, but we still have to tell the physics simulation which objects we want to collide. So to do that we still need to give them a Collision Event, although we will add no code to it, just a simple comment to tell the physics that these instances should interact.

Make two objects now and call them 'obj_StaticParent' and 'obj_DynamicParent'. Then add collision events in both of them checking for collisions with themselves and each other so that they look like this:

You should also add an Outside Room event to the Dynamic parent, and in that put the GML function instance_destroy() so that if any instance falls out the room it is removed.

Why do we have two parents? Well, in the physics simulation you can have have three basic types of object: static, dynamic and kinematic. Each one has slightly different properties and will behave in a different way:

Static - A static body is one that does not react to any external force, which means that it is unaffected by gravity or collisions and will remain immobile in the position that it is placed within the room unless explicitly moved through code. Think of the 'wall' blocks you would place in a top down game, for example - in a physics world they would be classed as static objects.
Dynamic - A dynamic body is one that participates in the full physics simulation and it will react to any forces applied to, like gravity or when in a collision. Anything that moves and reacts to other instances in a game would normally be dynamic.
Kinematic - A kinematic body is a sort of mix between static and dynamic. It is an instance that has been flagged as static, but has then been set in motion through code by setting it's speed directly (not through forces). If you think of a top down game again, then you could make any doors that slide open or closed kinematic so that they don't rotate or react to forces, but they do still move.

In this basic project, we won't be using kinematic objects, but we will need static and dynamic ones, which is why we have the two parent objects - it just simplifies collision checking a lot!

We now need to add four more physics enabled objects: one that is static for the 'floor', and three dynamic ones, so go ahead and create these four objects now and give each one an appropriate sprite from those we made earlier:

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You need to assign the floor object to have the obj_StaticParent as its parent, and the other three objects should be children of obj_DynamicParent to ensure that the collisions are resolved correctly. We can now move on and define the fixtures for the objects.

Okay, we have our physics enabled room and our objects, but we haven't actually given our objects any physical properties yet, have we? We need to tell GameMaker Studio 2 what properties the physics body will have, which will determine how it interacts with other physics bodies in the game. This is done by defining the fixture.

You define a fixture in two parts, the first being the shape it should have and the second being the properties it the shape should have.

Game Maker Physics