如何使3D腳本與2D（Unity C＃）一起使用

Question

所以我有一個腳本，當您單擊並拖動時會射出一個箭頭，有點像《憤怒的小鳥》。 我希望它可以與2D RigidBody和2D對撞機一起使用，但是當我將剛性體.AddForce更改為剛性體2D.AddForce時，它不起作用。

如何解決此問題以適用於2D？

我還希望箭頭在2D空間中向上或向下旋轉，具體取決於向后拉鼠標的位置。 當我嘗試鼠標外觀腳本時，它將在z軸上旋轉（我認為）並使箭頭變形。 任何簡單的解決方案來解決這個問題？

多謝你們。 我是游戲制作的新手，並且在過去10個小時內，我一直在嘗試弄清楚這些東西。 我需要一些專家幫助！ 謝謝！！！

這是我的劇本

using UnityEngine;
using System.Collections;

public class DragShotMover2 : MonoBehaviour {

public float maxDragLength = 2; // this is the base magnitude and the maximum length of the line drawn in the user interface
public float maxMultiplier = 5; // multiply the line length by this to allow for higher force values to be represented by shorter lines 
public Vector3 dragPlaneNormal = Vector3.up; // a vector describing the orientation of the drag plan relative to world-space but centered on the target
public SnapDir snapDirection = SnapDir.away; // force is applied either toward or away from the mouse on release
public ForceMode forceTypeToApply = ForceMode.VelocityChange;

public bool  overrideVelocity = true; // cancel the existing velocity before applying the new force
public bool  pauseOnDrag = true; // causes the simulation to pause when the object is clicked and unpause when released

public Color noForceColor = Color.yellow; // color of the visualization helpers at force 0
public Color maxForceColor = Color.red; // color of the visualization helpers at maximum force

public enum SnapDir {toward, away}

private Vector3 forceVector;
private float magPercent = 0;

private bool  mouseDragging = false;
private Vector3 mousePos3D;
private float dragDistance;
private Plane dragPlane;
private Ray mouseRay;
private GameObject dragZone;

private string shaderString = "Transparent/Diffuse";
private Material dzMat;

void  Start (){
    Color currentColor = noForceColor;
    dzMat = new Material(Shader.Find(shaderString));

    // create the dragzone visual helper
    dragZone = new GameObject("dragZone_" + gameObject.name);
    dragZone.AddComponent<MeshFilter>().mesh = MakeDiscMeshBrute(maxDragLength/4);
    //dragZone.GetComponent.MeshFilter.
    dragZone.AddComponent<MeshRenderer>();
    dragZone.renderer.enabled = false;

    dragZone.name = "dragZone_" + gameObject.name;
    dragZone.transform.localScale = new Vector3(maxDragLength*2, 0.025f, maxDragLength*2);
    dragZone.renderer.material = dzMat;
    dragZone.renderer.material.color = currentColor * new Color(1,1,1,0.2f);

    // create the dragplane
    dragPlane = new Plane(dragPlaneNormal, transform.position);

    // orient the drag plane
    if (dragPlaneNormal != Vector3.zero) {
        dragZone.transform.rotation = Quaternion.LookRotation(dragPlaneNormal) * new Quaternion(1, 0, 0, 1);
    } 
    else Debug.LogError("Drag plane normal cannot be equal to Vector3.zero.");

    //update the position of the dragzone
    dragZone.transform.position = transform.position;   
}

void  OnMouseDown (){
    mouseDragging = true;

    if (pauseOnDrag) {
        // pause the simulation
        Time.timeScale = 0;
    }
    // update the dragplane
    dragPlane = new Plane(dragPlaneNormal, transform.position);

    // orient the drag plane
    if (dragPlaneNormal != Vector3.zero) {
        dragZone.transform.rotation = Quaternion.LookRotation(dragPlaneNormal) * new Quaternion(1, 0, 0, 1);
    }
    else Debug.LogError("Drag plane normal cannot be equal to Vector3.zero.");

    //update the position of the dragzone
    dragZone.transform.position = transform.position;

    dragZone.renderer.enabled = true;
}



void  OnMouseDrag (){
    Color currentColor = noForceColor;
    // update the plane if the target object has left it
    if (dragPlane.GetDistanceToPoint(transform.position) != 0) {
        // update dragplane by constructing a new one -- I should check this with a profiler
        dragPlane = new Plane(dragPlaneNormal, transform.position);
    }

    // create a ray from the camera, through the mouse position in 3D space
    mouseRay = Camera.main.ScreenPointToRay(Input.mousePosition);

    // if mouseRay intersects with dragPlane
    float intersectDist = 0.0f;

    if (dragPlane.Raycast(mouseRay, out intersectDist)) {
        // update the world space point for the mouse position on the dragPlane
        mousePos3D = mouseRay.GetPoint(intersectDist);

        // calculate the distance between the 3d mouse position and the object position
        dragDistance = Mathf.Clamp((mousePos3D - transform.position).magnitude, 0, maxDragLength);

        // calculate the force vector
        if (dragDistance*maxMultiplier < 1) dragDistance = 0; // this is to allow for a "no move" buffer close to the object
        forceVector = mousePos3D - transform.position;
        forceVector.Normalize();
        forceVector *= dragDistance * maxMultiplier;

        // update color the color
        // calculate the percentage value of current force magnitude out of maximum
        magPercent = (dragDistance * maxMultiplier) / (maxDragLength * maxMultiplier);
        // choose color based on how close magPercent is to either 0 or max
        currentColor = noForceColor * (1-magPercent) + maxForceColor * magPercent;

        // dragzone color
        dragZone.renderer.material.color = currentColor * new Color(1,1,1,0.2f);

        // draw the line
        Debug.DrawRay(transform.position, forceVector / maxMultiplier, currentColor);
    }

    //update the position of the dragzone
    dragZone.transform.position = transform.position;
}

void  OnMouseUp (){
    mouseDragging = false;

    if (overrideVelocity) {
        // cancel existing velocity
        rigidbody.AddForce(-rigidbody.velocity, ForceMode.VelocityChange);

    }

    // add new force
    int snapD = 1;
    if (snapDirection == SnapDir.away) snapD = -1; // if snapdirection is "away" set the force to apply in the opposite direction
    rigidbody.AddForce(snapD * forceVector, forceTypeToApply);

    // cleanup
    dragZone.renderer.enabled = false;

    if (pauseOnDrag) {
        // un-pause the simulation
        Time.timeScale = 1;
    }

}

void  OnGUI (){
    if (mouseDragging) {
        Vector2 guiMouseCoord = GUIUtility.ScreenToGUIPoint(Input.mousePosition);
        GUI.Box ( new Rect(guiMouseCoord.x-30, Screen.height-guiMouseCoord.y+15, 100, 20), "force: "+Mathf.Round((forceVector).magnitude));
    }
}

Mesh MakeDiscMeshBrute ( float r  ){
    Mesh discMesh;
    Vector3[] dmVerts = new Vector3[18];
    Vector3[] dmNorms = new Vector3[18];
    Vector2[] dmUVs = new Vector2[18];
    int[] dmTris = new int[48];
    int i = 0;

    discMesh = new Mesh();

    dmVerts[0] = new Vector3(0,0,0);
    dmVerts[1] = new Vector3(0,0,r);
    dmVerts[2] = new Vector3(1,0,1).normalized * r; // find the vector at the correct distance the hacky-hillbilly way!
    dmVerts[3] = new Vector3(r,0,0);
    dmVerts[4] = new Vector3(1,0,-1).normalized * r;
    dmVerts[5] = new Vector3(0,0,-r);
    dmVerts[6] = new Vector3(-1,0,-1).normalized * r;
    dmVerts[7] = new Vector3(-r,0,0);
    dmVerts[8] = new Vector3(-1,0,1).normalized * r;

    // set the other side to the same points
    for (i = 0; i<dmVerts.Length/2; i++) {
        dmVerts[dmVerts.Length/2 + i] = dmVerts[i];
    }
    for (i = 0; i<dmNorms.Length; i++) {
        if (i<dmNorms.Length/2) dmNorms[i] = Vector3.up; // set side one to face up
        else dmNorms[i] = -Vector3.up; // set side two to face down
    }

    dmUVs[0] = new Vector2(0,0);
    dmUVs[1] = new Vector2(0,r);
    dmUVs[2] = new Vector2(1,1).normalized * r;;
    dmUVs[3] = new Vector2(r,0);
    dmUVs[4] = new Vector2(1,-1).normalized * r;;
    dmUVs[5] = new Vector2(0,-r);
    dmUVs[6] = new Vector2(-1,-1).normalized * r;;
    dmUVs[7] = new Vector2(-r,0);
    dmUVs[8] = new Vector2(-1,1).normalized * r;;

    // set the other side to the same points
    for (i = 0; i<dmUVs.Length/2; i++) {
        dmUVs[dmUVs.Length/2 + i] = dmUVs[i];
    }

    dmTris[0] = 0;
    dmTris[1] = 1;
    dmTris[2] = 2;

    dmTris[3] = 0;
    dmTris[4] = 2;
    dmTris[5] = 3;

    dmTris[6] = 0;
    dmTris[7] = 3;
    dmTris[8] = 4;

    dmTris[9] = 0;
    dmTris[10] = 4;
    dmTris[11] = 5;

    dmTris[12] = 0;
    dmTris[13] = 5;
    dmTris[14] = 6;

    dmTris[15] = 0;
    dmTris[16] = 6;
    dmTris[17] = 7;

    dmTris[18] = 0;
    dmTris[19] = 7;
    dmTris[20] = 8;

    dmTris[21] = 0;
    dmTris[22] = 8;
    dmTris[23] = 1;

    // side two
    dmTris[24] = 9;
    dmTris[25] = 11;
    dmTris[26] = 10;

    dmTris[27] = 9;
    dmTris[28] = 12;
    dmTris[29] = 11;

    dmTris[30] = 9;
    dmTris[31] = 13;
    dmTris[32] = 12;

    dmTris[33] = 9;
    dmTris[34] = 14;
    dmTris[35] = 13;

    dmTris[36] = 9;
    dmTris[37] = 15;
    dmTris[38] = 14;

    dmTris[39] = 9;
    dmTris[40] = 16;
    dmTris[41] = 15;

    dmTris[42] = 9;
    dmTris[43] = 17;
    dmTris[44] = 16;

    dmTris[45] = 9;
    dmTris[46] = 10;
    dmTris[47] = 17;

    discMesh.vertices = dmVerts;
    discMesh.uv = dmUVs;
    discMesh.normals = dmNorms;
    discMesh.triangles = dmTris;

    return discMesh;
}

}

Answer 1

如果您想繼續使用3D Rigidbody，我建議您僅使用RigidbodyConstraints ，這樣您就可以鎖定z（或其他方向）軸/旋轉，它的性能與2D Platformer完全相同。