An axis-aligned bounding box, or AABB for short, is a box aligned with coordinate axes and fully enclosing
some object. Because the box is never rotated with respect to the axes, it can be defined by just its
center and extents, or alternatively by min and max points.
Bounds is used by Collider.bounds, Mesh.bounds and Renderer.bounds.
using UnityEngine;
public class BoundsVisualizer : MonoBehaviour
{
public Bounds bounds;
void Start()
{
// Example bounds setup if not assigned
if (bounds.size == Vector3.zero)
bounds = new Bounds(transform.position, Vector3.one);
}
void Update()
{
DrawBounds(bounds, Color.red);
}
void DrawBounds(Bounds b, Color color)
{
Vector3 min = b.min;
Vector3 max = b.max;
Vector3[] corners = new Vector3[8];
// Bottom
corners[0] = new Vector3(min.x, min.y, min.z);
corners[1] = new Vector3(max.x, min.y, min.z);
corners[2] = new Vector3(max.x, min.y, max.z);
corners[3] = new Vector3(min.x, min.y, max.z);
// Top
corners[4] = new Vector3(min.x, max.y, min.z);
corners[5] = new Vector3(max.x, max.y, min.z);
corners[6] = new Vector3(max.x, max.y, max.z);
corners[7] = new Vector3(min.x, max.y, max.z);
// Bottom rectangle
Debug.DrawLine(corners[0], corners[1], color);
Debug.DrawLine(corners[1], corners[2], color);
Debug.DrawLine(corners[2], corners[3], color);
Debug.DrawLine(corners[3], corners[0], color);
// Top rectangle
Debug.DrawLine(corners[4], corners[5], color);
Debug.DrawLine(corners[5], corners[6], color);
Debug.DrawLine(corners[6], corners[7], color);
Debug.DrawLine(corners[7], corners[4], color);
// Vertical edges
Debug.DrawLine(corners[0], corners[4], color);
Debug.DrawLine(corners[1], corners[5], color);
Debug.DrawLine(corners[2], corners[6], color);
Debug.DrawLine(corners[3], corners[7], color);
}
}