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Aug 5th, 2019

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using UnityEngine;
[RequireComponent(typeof(CapsuleCollider))]
public class CapsuleCastCheck : MonoBehaviour
{
private CapsuleCollider capsule = null;
[SerializeField]
private float checkAngle = 0f;
[SerializeField]
private float checkDist = 1f;
private void OnDrawGizmosSelected()
{
if (capsule == null)
capsule = GetComponent<CapsuleCollider>();
// incorrect
//Vector3 pointOffset = Vector3.up * (capsule.height / 2f);
// correct
Vector3 pointOffset = Vector3.up * (capsule.height / 2f - capsule.radius);
Vector3 point1 = transform.TransformPoint(pointOffset);
Vector3 point2 = transform.TransformPoint(-pointOffset);
Vector3 checkDir = Quaternion.AngleAxis(checkAngle, transform.up) * transform.forward;
bool hit = Physics.CapsuleCast(point1, point2, capsule.radius, checkDir, checkDist);
Gizmos.color = Color.gray;
Gizmos.DrawWireSphere(transform.TransformPoint(pointOffset), capsule.radius);
Gizmos.DrawWireSphere(transform.TransformPoint(-pointOffset), capsule.radius);
Gizmos.color = hit ? Color.green : Color.red;
Gizmos.DrawWireSphere(transform.TransformPoint(pointOffset) + checkDir, capsule.radius);
Gizmos.DrawWireSphere(transform.TransformPoint(-pointOffset) + checkDir, capsule.radius);
}
}

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