force | 力在 X 轴和 Y 轴上的分量。 |
mode | 用于施加指定力的方法。 |
对刚体施加力。
力被指定为在 X 和 Y 方向(在 2D 物理中,没有 Z 方向)上的两个独立分量。对象在力的作用下的加速运动遵循力 = 质量 x 加速度 法则 - 即质量越大,加速到给定速度所需的力也越大。
如果未指定 ForceMode2D,则使用默认值。
此情况下的默认值为 ForceMode2D.Force,它会随时间推移增加力(考虑质量)。
若要使用以下示例脚本,请将所选脚本拖放到层级视图中的精灵上。确保精灵具有 Rigidbody2D 组件。
另请参阅:AddForceAtPosition、AddTorque、mass、velocity、AddForce、ForceMode2D。
// The sprite will fall under its weight. After a short time the // sprite will start its upwards travel due to the thrust force that // is added in the opposite direction.
using UnityEngine; using System.Collections;
public class Example : MonoBehaviour { public Texture2D tex;
private Rigidbody2D rb2D; private Sprite mySprite; private SpriteRenderer sr; private float thrust = 1f;
void Awake() { sr = gameObject.AddComponent<SpriteRenderer>(); rb2D = gameObject.AddComponent<Rigidbody2D>(); }
void Start() { mySprite = Sprite.Create(tex, new Rect(0.0f, 0.0f, 128.0f, 128.0f), new Vector2(0.5f, 0.5f), 100.0f);
sr.color = new Color(0.9f, 0.9f, 0.5f, 1.0f); sr.sprite = mySprite; transform.position = new Vector3(0.0f, -2.0f, 0.0f); }
void FixedUpdate() { rb2D.AddForce(transform.up * thrust); // Alternatively, specify the force mode, which is ForceMode2D.Force by default rb2D.AddForce(transform.up * thrust, ForceMode2D.Impulse); } }
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