57 lines
1.8 KiB
C#
57 lines
1.8 KiB
C#
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using UnityEngine;
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using static MenteBacata.ScivoloCharacterController.Internal.Math;
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namespace MenteBacata.ScivoloCharacterController.Internal
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{
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public static class GeometricTests
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{
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/// <summary>
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/// Checks for the intersection between a line and a plane.
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/// </summary>
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public static bool CheckLineAndPlaneIntersection(Vector3 lineStart, Vector3 lineEnd, in Plane plane, out Vector3 intersectionPoint)
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{
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float planeD = plane.d;
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Vector3 planeNormal = plane.normal;
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float startDotNormal = Dot(lineStart, planeNormal);
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float endDotNormal = Dot(lineEnd, planeNormal);
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if (startDotNormal == planeD)
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{
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intersectionPoint = lineStart;
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return true;
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}
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else if (endDotNormal == planeD)
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{
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intersectionPoint = lineEnd;
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return true;
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}
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else if ((startDotNormal > planeD) ^ (endDotNormal > planeD))
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{
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float t = (planeD - startDotNormal) / (endDotNormal - startDotNormal);
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// Better be safe here...
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if (t <= 0f)
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intersectionPoint = lineStart;
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else if (t >= 1f)
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intersectionPoint = lineEnd;
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else
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intersectionPoint = lineStart + t * (lineEnd - lineStart);
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return true;
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}
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intersectionPoint = default;
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return false;
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}
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/// <summary>
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/// Checks if the point is in front of the plane.
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/// </summary>
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public static bool IsPointInFrontOfPlane(Vector3 point, in Plane plane)
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{
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return Dot(point, plane.normal) > plane.d;
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}
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}
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}
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