Cross-multiplication realizes the position judgment of the character and the enemy (upper left, bottom left, upper right, bottom right)

We often encounter this problem in the game. For example, if the enemy encounters the protagonist, he will rotate over him. Or judge the protagonist on the left or right, etc.

:

The cross of a vector, a, B, gets a C vector perpendicular to them, and we can judge a region of the enemy's four regions by the value above.

The implementation of the Code:

usingUnityengine;usingSystem.Collections; Public classTest:monobehaviour { PublicTransform A;  PublicTransform B;  PublicTextmesh text;  PublicTextmesh Oneresult;  PublicTextmesh Tworesult;  Public floatdistance; Private floatdot;  Public voidUpdate () {//b in front of a, A is the protagonist, B is the enemyVector3 Toother = a.transform.position-b.position; //gets the Y to judge the enemy on the left and right side of the characterVector3 chaCheng1 =Vector3.cross (A.forward, Toother); Vector3 chaCheng2=Vector3.cross (A.right, Toother); Oneresult.text=chacheng1.tostring (); Tworesult.text=chacheng2.tostring (); Debug.Log ("first-time value:"+chaCheng1); //Gets the Y can judge the enemy in front of the character and behindDebug.Log ("second time value:"+chaCheng2); if(Chacheng1.y >0&& chacheng2.y >0) {Text.text="Location: Upper left"; }        if(Chacheng1.y <0&& Chacheng2.y <0) {Text.text="location: Lower right"; }        if(Chacheng1.y >0&& Chacheng2.y <0) {Text.text="location: Lower left"; }        if(Chacheng1.y <0&& chacheng2.y >0) {Text.text="Location: Upper right"; }    }    }

Project: Http://yunpan.cn/cdYkG48mxIGGD access password 54c3

Cross-multiplication realizes the position judgment of the character and the enemy (upper left, bottom left, upper right, bottom right)