PhysicsShape2D.radius

描述

形状的半径。

所有 PhysicsShapeType2D 都使用此半径，除了 Polygon 类型。有关如何将半径用于各个形状的信息，请参阅各个形状类型。

using UnityEngine;
using UnityEngine.Assertions;

public class Example : MonoBehaviour
{
    void Start()
    {
        // Create a shape group.
        var shapeGroup = new PhysicsShapeGroup2D();

        // Add a Circle to the shape group.
        var circleShapeIndex = shapeGroup.AddCircle
            (
                center: new Vector2(-2f, 3f),
                radius: 1f
            );

        // Add a Capsule to the shape group.
        var capsuleShapeIndex = shapeGroup.AddCapsule
            (
                vertex0: Vector2.down,
                vertex1: Vector2.up,
                radius: 0.5f
            );

        // Fetch the shapes.
        var circleShape = shapeGroup.GetShape(circleShapeIndex);
        var capsuleShape = shapeGroup.GetShape(capsuleShapeIndex);

        // Validate the shape radius.
        Assert.AreApproximatelyEqual(1f, circleShape.radius);
        Assert.AreApproximatelyEqual(0.5f, capsuleShape.radius);
    }
}