83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Util/IndexUtil.h"
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using namespace UE::Geometry;
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// integer indices offsets in x/y directions
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const FVector2i IndexUtil::GridOffsets4[] =
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{
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FVector2i(-1, 0), FVector2i(1, 0),
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FVector2i(0, -1), FVector2i(0, 1)
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};
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// integer indices offsets in x/y directions and diagonals
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const FVector2i IndexUtil::GridOffsets8[] =
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{
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FVector2i(-1, 0), FVector2i(1, 0),
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FVector2i(0, -1), FVector2i(0, 1),
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FVector2i(-1, 1), FVector2i(1, 1),
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FVector2i(-1, -1), FVector2i(1, -1)
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};
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// integer indices offsets in x/y/z directions, corresponds w/ BoxFaces directions
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const FVector3i IndexUtil::GridOffsets6[] =
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{
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FVector3i( 0, 0,-1), FVector3i( 0, 0, 1),
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FVector3i(-1, 0, 0), FVector3i( 1, 0, 0),
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FVector3i( 0,-1, 0), FVector3i( 0, 1, 0)
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};
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// integer indices offsets in x/y/z directions and diagonals
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const FVector3i IndexUtil::GridOffsets26[] =
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{
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// face-nbrs
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FVector3i(0, 0,-1), FVector3i(0, 0, 1),
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FVector3i(-1, 0, 0), FVector3i(1, 0, 0),
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FVector3i(0,-1, 0), FVector3i(0, 1, 0),
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// edge-nbrs (+y, 0, -y)
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FVector3i(1, 1, 0), FVector3i(-1, 1, 0),
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FVector3i(0, 1, 1), FVector3i(0, 1,-1),
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FVector3i(1, 0, 1), FVector3i(-1, 0, 1),
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FVector3i(1, 0,-1), FVector3i(-1, 0,-1),
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FVector3i(1, -1, 0), FVector3i(-1,-1, 0),
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FVector3i(0, -1, 1), FVector3i(0,-1,-1),
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// corner-nbrs (+y,-y)
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FVector3i(1, 1, 1), FVector3i(-1, 1, 1),
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FVector3i(1, 1,-1), FVector3i(-1, 1,-1),
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FVector3i(1,-1, 1), FVector3i(-1,-1, 1),
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FVector3i(1,-1,-1), FVector3i(-1,-1,-1)
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};
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// corners [ (-x,-y), (x,-y), (x,y), (-x,y) ], -z, then +z
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//
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// 7---6 +z or 3---2 -z
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// |\ |\ |\ |\
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// 4-\-5 \ 0-\-1 \
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// \ 3---2 \ 7---6
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// \| | \| |
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// 0---1 -z 4---5 +z
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//
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const int IndexUtil::BoxFaces[6][4] =
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{
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{ 0, 1, 2, 3 }, // back, -z
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{ 5, 4, 7, 6 }, // front, +z
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{ 4, 0, 3, 7 }, // left, -x
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{ 1, 5, 6, 2 }, // right, +x,
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{ 4, 5, 1, 0 }, // bottom, -y
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{ 3, 2, 6, 7 } // top, +y
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};
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static const FVector2i UV00(0, 0);
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static const FVector2i UV10(1, 0);
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static const FVector2i UV11(1, 1);
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static const FVector2i UV01(0, 1);
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const FVector2i IndexUtil::BoxFacesUV[4] = { UV00, UV10, UV11, UV01 };
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const int IndexUtil::BoxFaceNormals[6] = { -3, 3, -1, 1, -2, 2 };
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