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64 行
2.3 KiB
64 行
2.3 KiB
using System;
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using static Unity.Mathematics.math;
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namespace Unity.Mathematics
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{
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[Serializable]
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public partial struct AABB
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{
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public float3 Center;
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public float3 Extents;
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public float3 Size { get { return Extents * 2; } }
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public bool Contains(float3 point)
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{
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if (point[0] < Center[0] - Extents[0])
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return false;
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if (point[0] > Center[0] + Extents[0])
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return false;
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if (point[1] < Center[1] - Extents[1])
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return false;
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if (point[1] > Center[1] + Extents[1])
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return false;
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if (point[2] < Center[2] - Extents[2])
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return false;
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if (point[2] > Center[2] + Extents[2])
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return false;
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return true;
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}
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public bool Contains(AABB b)
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{
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return Contains(b.Center + float3(-b.Extents.x, -b.Extents.y, -b.Extents.z))
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&& Contains(b.Center + float3(-b.Extents.x, -b.Extents.y, b.Extents.z))
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&& Contains(b.Center + float3(-b.Extents.x, b.Extents.y, -b.Extents.z))
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&& Contains(b.Center + float3(-b.Extents.x, b.Extents.y, b.Extents.z))
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&& Contains(b.Center + float3( b.Extents.x, -b.Extents.y, -b.Extents.z))
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&& Contains(b.Center + float3( b.Extents.x, -b.Extents.y, b.Extents.z))
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&& Contains(b.Center + float3( b.Extents.x, b.Extents.y, -b.Extents.z))
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&& Contains(b.Center + float3( b.Extents.x, b.Extents.y, b.Extents.z));
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}
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static float3 RotateExtents(float3 extents, float3 m0, float3 m1, float3 m2)
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{
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return math.abs(m0 * extents.x) + math.abs(m1 * extents.y) + math.abs(m2 * extents.z);
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}
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public static AABB Transform(float4x4 transform, AABB localBounds)
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{
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AABB transformed;
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transformed.Extents = RotateExtents(localBounds.Extents, transform.c0.xyz, transform.c1.xyz, transform.c2.xyz);
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transformed.Center = math.transform(transform, localBounds.Center);
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return transformed;
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}
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public float DistanceSq(float3 point)
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{
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return lengthsq(max(abs(point - Center), Extents) - Extents);
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}
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}
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}
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