We can take advantage of the fact that there is a right triangle formed by the center point of the lower cap of the capsule, capsule contact point, and raycast hit point. We are trying to find the length of the red line which is the length of the ground raycast when the capsule is grounded. It turns out cosine is the only trigonometric function we need: cos(θ) = adjacent side / hypotenuse We know the radius of the capsule and we can get the normal vector of the surface from the raycast hit information. This requires a little bit of trigonometry. If the raycast is too short, it won't touch the ground on a slope, even though the character should be considered grounded.Ī straightforward solution I came up with (maybe this is standard practice, I have no idea) is to accept different raycast hit distances depending on the angle of the surface it hits. A side effect is that jump may be applied multiple FixedUpdates in a row while the ray is still hitting. If the raycast is too long, the character will be grounded even if it is not actually touching the ground. There is a problem with this right away though.
To put it simply, we start at the base of the capsule and do a raycast downward and see if it hits something. We need to make sure the character is on the ground or else holding the jump input button will make the character fly into the sky! This will also take the slope into consideration so that the character can't jump if sliding down a too-steep slope. If we don't do this check, jumping won't work right. The character will be made up of the following components:Ī physical body made up of a Capsule Collider and RigidbodyĪ SimpleCharacterController script that takes and responds to inputĪn InputController script or a SimpleCharacterAgent script if you’re using ML-AgentsĬreate a new C# script called SimpleCharacterController.cs and open it.ĭelete the Start() and Update() functions so that you have a clean, empty class.ĬheckGrounded() will check whether the character is on the ground and update the IsGrounded variable.
IsGrounded functionality (prevents jumping while airborne, plus is useful for other stuff) Slope limit (prevents jumping up steep slopes) The functionality we’ll make for this character includes: We will not use the built in Unity CharacterController primarily because we want a character that works with Rigidbody physics.
In this tutorial you’ll learn how to create a very simple character controller for Unity that also works with ML-Agents.
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