Need to know the meaning of the function "getInputVector"

[Vat1n]

Hello.

I was searching the signification of the method getInputVector(). I've found it in Entity.java

private static Vec3 getInputVector(Vec3 pRelative, float pMotionScaler, float pFacing) { 
double d0 = pRelative.lengthSqr(); 
if (d0 < 1.0E-7D) { 
	return Vec3.ZERO;
} else { 
	Vec3 vec3 = (d0 > 1.0D ? pRelative.normalize() : pRelative).scale((double)pMotionScaler); 
	float f = Mth.sin(pFacing * ((float)Math.PI / 180F)); 
	float f1 = Mth.cos(pFacing * ((float)Math.PI / 180F));
	return new Vec3(vec3.x * (double)f1 - vec3.z * (double)f, vec3.y, vec3.z * (double)f1 + vec3.x * (double)f); 
  } 
}

Here is another function which uses the getInputVector :

public void moveRelative(float pAmount, Vec3 pRelative) {
      Vec3 vec3 = getInputVector(pRelative, pAmount, this.getYRot());
      this.setDeltaMovement(this.getDeltaMovement().add(vec3));
   }

Could someone explain me what is the goal of this method please ?

[ChampionAsh5357]

12 hours ago, Vat1n said:

Could someone explain me what is the goal of this method please ?

To set the movement of the entity towards the direction of the passed in vector.

[Vat1n]

Thank you for your answer. I understand now : Imagine you want to move diagonally (in relation to the axes X and Z), you have to set X movement and Z movement. Then we'll have to deal with Pythagorean theorem or something like that in order to get the correct value for the diagonal movement 😄

Edited February 26, 2023 by Vat1n