Question Advanced Math Problem

Hi,
Im currently making a 3d top down shooter.
The game itself is good, but there s a problem with vectors:
In my game you move pressing the WASD keys (W upward, D downward, A left and D right) and the chatacters looks torwards the mouse in order to shoot where you aim. The problem here is that I want to add a model to my character, I added it and it works fine. Later on I dowloaded some animations from mixamo, one for idle and eight for walking (One in each direction) i created a 2d blend tree to store the anmations, but, and here the problem:
If my character is looking upwards, and you press the W key, it should play the animation walk forward (Since is walking in the same direction is looking)
But if is looking downwards and you press the W key, it should play the move backwards animation.
I need some sort of formula to solve this.
(If you dont understand what I mean, look in Karnage.io how the walk animations are played)

 

Transforms have a .forward property.

You can observe the .y element of that property to decide look up / look down.

Code (csharp):

1. float yLook = myLookTransform.forward.y;
2.  
3. if (yLook > 0) Debug.Log( "I am looking upward");
4.  
5. if (yLook < 0) Debug.Log( "I am looking downward");

 

It sounds like you want to inverse transform the walking direction. https://docs.unity3d.com/ScriptReference/Transform.InverseTransformDirection.html

This answers the question "How would a vector be relative to the character facing.", if the character was the center of the world and everything revolved around the character.

Code (CSharp):

1. // Assume walking direction is fetched from Input. This is in world coordinates, so up is "up relative to the screen".
2. Vector3 walkingDirection = ....;
3.  
4. // Transform this direction into local coordinates, that is, relative to the character
5. Vector3 localWalkingDirection = transform.InverseTransformDirection(walkingDirection);
6.  
7. // Now you can relate walking direction to animation, if facing down, then W will show as backwards. (I don't know how animation works, so I can just help with the vector.)
8. ApplyAnimation(localWalkingDirection);
9.  
10. // Finally, apply the direction to the character
11. transform.position += walkingDirection * speed * Time.deltaTime;

Code written from the top of my head. Sorry for any errors.

 

Thanks for your reply.
Even if my code is slightly different than yours, the transform.inverseTransformDirection worked. Thanks!