On the other hand, if we switch to slide mode, the result looks like this: Curved surfaces have a different normal at each point, resulting in a proper looking bounce off a round object: Note that not only flat surfaces have normals. Here is an example using the reflect() option: Note that the length of the resulting vector when using slide() is only the component of the remaining motion in the desired direction. If we wish the body to slide along the object’s surface, we use n.slide() and if we want it to bounce, we use n.reflect(). Using this vector we can calculate the response. This vector tells us what direction the surface is facing (for example which edge of a shape was hit). In either case, we need to know the obstacle’s normal.Ī normal vector is a unit-length vector pointing perpendicularly away from a surface. Now we have a choice: to slide the body along the obstacle (as if it were sticky) or to reflect it off (i.e. The red vector is the returned value of the move() method: representing the amount of the movement that was unable to be completed. However, the green obstacle is in the way, so the move will stop when the collision occurs. Here we see the gray vector representing the desired movement, which we will pass to the move method. Let’s look at this process in more detail:
#Godot move and slide how to#
We then have two choices of how to respond to this collision.
The method returns another Vector2 representing the motion remaining after a collision. This method takes a Vector2 as its argument, which represents the distance & direction you wish to move the body. When using a KinematicBody2D, you must use the move() method to change its position. The basic structure of a KinematicBody2D scene is this:įor the example in this demonstration, we’ll use a round image for the sprite, and a circular collision shape: And while collision detection is very simple in Godot (the physics bodies just take care of it), we also need to understand how to make the bodies respond to collisions.
#Godot move and slide full#
Node is perfect for implementing characters and other moving bodies that don’t need the full simulation of physics, but just need movement and collision detection. We have seen before how the KinematicBody2D You can watch a video version of this lesson here: We don’t believe in dumbing-down the material for kids, and game development is hard - so it will probably be challenging no matter what your age. If you’re new here, a quick note about this website: we’re called KidsCanCode because we teach programming and game development to kids, but if you’re an adult you’re welcome here, too. If you’ve never used a game engine before, or if you’re just new to Godot, this is the place to start. Godot 101 is an introduction to the Godot game engine and how it works. If you haven’t already read through the previous parts, please start with Part 1.
In this installment, we take a deeper look at how to handle KinematicBody2D collisions in a simple and accurate way, and how to avoid a few common mistakes. Godot 101 - Part 13: KinematicBody2D Collisions Done Right by Chris Bradfield Sat, Tags:
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