52 lines
2.4 KiB
C#
52 lines
2.4 KiB
C#
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using UnityEngine;
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//https://gist.github.com/AkhmadMax, modified
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public static class RendererExtensions
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{
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/// <summary>
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/// Counts the bounding box corners of the given RectTransform that are visible from the given Camera in screen space.
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/// </summary>
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/// <returns>The amount of bounding box corners that are visible from the Camera.</returns>
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/// <param name="rectTransform">Rect transform.</param>
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/// <param name="camera">Camera.</param>
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private static int CountCornersVisibleFrom(this RectTransform rectTransform)
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{
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Rect screenBounds = new Rect(0f, 0f, Screen.width, Screen.height); // Screen space bounds (assumes camera renders across the entire screen)
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Vector3[] objectCorners = new Vector3[4];
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rectTransform.GetWorldCorners(objectCorners);
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int visibleCorners = 0;
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for (var i = 0; i < objectCorners.Length; i++) // For each corner in rectTransform
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{
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if (screenBounds.Contains(objectCorners[i])) // If the corner is inside the screen
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{
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visibleCorners++;
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}
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}
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return visibleCorners;
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}
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/// <summary>
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/// Determines if this RectTransform is fully visible from the specified camera.
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/// Works by checking if each bounding box corner of this RectTransform is inside the cameras screen space view frustrum.
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/// </summary>
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/// <returns><c>true</c> if is fully visible from the specified camera; otherwise, <c>false</c>.</returns>
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/// <param name="rectTransform">Rect transform.</param>
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/// <param name="camera">Camera.</param>
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public static bool IsFullyVisibleFrom(this RectTransform rectTransform)
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{
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return CountCornersVisibleFrom(rectTransform) == 4; // True if all 4 corners are visible
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}
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/// <summary>
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/// Determines if this RectTransform is at least partially visible from the specified camera.
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/// Works by checking if any bounding box corner of this RectTransform is inside the cameras screen space view frustrum.
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/// </summary>
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/// <returns><c>true</c> if is at least partially visible from the specified camera; otherwise, <c>false</c>.</returns>
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/// <param name="rectTransform">Rect transform.</param>
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/// <param name="camera">Camera.</param>
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public static bool IsVisible(this RectTransform rectTransform)
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{
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return CountCornersVisibleFrom(rectTransform) > 0; // True if any corners are visible
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}
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}
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