522 lines
No EOL
32 KiB
C#
522 lines
No EOL
32 KiB
C#
using Godot;
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using System;
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using System.Collections.Generic;
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namespace IslaApocalypse.Core
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{
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public static class MarchingCubes
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{
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/// <summary>
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/// The Edge Table (256 values).
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/// This array uses an 8-bit index (representing the 8 corners of a cube)
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/// to look up a 12-bit value. Each bit in the returned value corresponds to
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/// one of the 12 edges of the cube, telling the engine if that edge is intersected.
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/// </summary>
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public static readonly int[] EdgeTable = new int[256] {
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0x0 , 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c,
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0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
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0x190, 0x99 , 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c,
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0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
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0x230, 0x339, 0x33 , 0x13a, 0x636, 0x73f, 0x435, 0x53c,
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0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
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0x3a0, 0x2a9, 0x1a3, 0xaa , 0x7a6, 0x6af, 0x5a5, 0x4ac,
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0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
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0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c,
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0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
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0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0xff , 0x3f5, 0x2fc,
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0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
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0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x55 , 0x15c,
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0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
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0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0xcc ,
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0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
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0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc,
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0xcc , 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
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0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c,
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0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
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0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc,
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0x2fc, 0x3f5, 0xff , 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
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0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c,
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0x36c, 0x265, 0x16f, 0x66 , 0x76a, 0x663, 0x569, 0x460,
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0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac,
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0x4ac, 0x5a5, 0x6af, 0x7a6, 0xaa , 0x1a3, 0x2a9, 0x3a0,
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0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c,
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0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x33 , 0x339, 0x230,
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0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c,
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0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x99 , 0x190,
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0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c,
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0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x0
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};
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/// <summary>
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/// The Triangulation Table (256 rows, 16 columns).
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/// Once we know which edges are intersected, this table tells us exactly
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/// how to connect those intersections to draw up to 5 triangles.
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/// A value of -1 means "stop drawing triangles".
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/// </summary>
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public static readonly int[,] TriTable = new int[256, 16] {
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{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1},
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{3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1},
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{3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1},
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{3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1},
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{9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1},
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{1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1},
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{9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
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{2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1},
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{8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1},
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{9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
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{4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1},
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{3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1},
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{1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1},
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{4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1},
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{4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1},
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{9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1},
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{1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
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{5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1},
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{2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1},
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{9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
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{0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
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{2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1},
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{10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1},
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{4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1},
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{5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1},
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{5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1},
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{9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1},
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{0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1},
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{1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1},
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{10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1},
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{8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1},
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{2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1},
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{7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1},
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{9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1},
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{2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1},
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{11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1},
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{9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1},
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{5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1},
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{11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1},
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{11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
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{1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1},
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{9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1},
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{5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1},
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{2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
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{0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
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{5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1},
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{6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1},
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{0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1},
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{3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1},
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{6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1},
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{5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1},
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{1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
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{10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1},
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{6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1},
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{1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1},
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{8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1},
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{7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1},
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{3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
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{5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1},
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{0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1},
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{9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1},
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{8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1},
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{5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1},
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{0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1},
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{6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1},
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{10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1},
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{10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1},
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{8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1},
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{1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1},
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{3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1},
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{0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1},
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{10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1},
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{0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1},
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{3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1},
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{6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1},
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{9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1},
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{8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1},
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{3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1},
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{6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1},
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{0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1},
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{10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1},
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{10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1},
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{1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1},
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{2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1},
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{7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1},
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{7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1},
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{2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1},
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{1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1},
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{11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1},
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{8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1},
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{0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1},
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{7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
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{8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
|
|
{10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
|
|
{2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
|
|
{6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1},
|
|
{7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1},
|
|
{2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1},
|
|
{10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1},
|
|
{10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1},
|
|
{0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1},
|
|
{7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1},
|
|
{6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1},
|
|
{8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1},
|
|
{6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1},
|
|
{4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1},
|
|
{10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1},
|
|
{8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1},
|
|
{1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1},
|
|
{8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1},
|
|
{10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1},
|
|
{10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
|
|
{5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
|
|
{11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1},
|
|
{9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
|
|
{6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1},
|
|
{7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1},
|
|
{3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1},
|
|
{7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1},
|
|
{3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1},
|
|
{6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1},
|
|
{9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1},
|
|
{1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1},
|
|
{4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1},
|
|
{7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1},
|
|
{6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1},
|
|
{0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1},
|
|
{6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1},
|
|
{0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1},
|
|
{11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1},
|
|
{6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1},
|
|
{5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1},
|
|
{9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1},
|
|
{1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1},
|
|
{10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1},
|
|
{0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1},
|
|
{5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1},
|
|
{10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1},
|
|
{11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1},
|
|
{9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1},
|
|
{7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1},
|
|
{2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1},
|
|
{8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1},
|
|
{9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1},
|
|
{9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1},
|
|
{1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1},
|
|
{5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1},
|
|
{0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1},
|
|
{10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1},
|
|
{2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1},
|
|
{0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1},
|
|
{0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1},
|
|
{9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1},
|
|
{5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1},
|
|
{5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1},
|
|
{8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1},
|
|
{9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1},
|
|
{1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1},
|
|
{3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1},
|
|
{4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1},
|
|
{9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1},
|
|
{11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1},
|
|
{11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1},
|
|
{2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1},
|
|
{9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1},
|
|
{3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1},
|
|
{1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1},
|
|
{4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1},
|
|
{0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1},
|
|
{9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1},
|
|
{1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
|
|
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}
|
|
};
|
|
|
|
/// <summary>
|
|
/// The local offsets of the 8 corners of a single voxel cube.
|
|
/// </summary>
|
|
public static readonly Vector3[] CornerOffsets = new Vector3[8] {
|
|
new Vector3(0, 0, 0), new Vector3(1, 0, 0), new Vector3(1, 0, 1), new Vector3(0, 0, 1),
|
|
new Vector3(0, 1, 0), new Vector3(1, 1, 0), new Vector3(1, 1, 1), new Vector3(0, 1, 1)
|
|
};
|
|
|
|
/// <summary>
|
|
/// Defines which two corners make up each of the 12 edges.
|
|
/// </summary>
|
|
public static readonly int[,] EdgeConnections = new int[12, 2] {
|
|
{0,1}, {1,2}, {2,3}, {3,0}, // Bottom face edges
|
|
{4,5}, {5,6}, {6,7}, {7,4}, // Top face edges
|
|
{0,4}, {1,5}, {2,6}, {3,7} // Vertical pillars
|
|
};
|
|
|
|
/// <summary>
|
|
/// Maps block IDs to vertex colors for the generated mesh. You can customize this to match your BiomePalette or block types!
|
|
/// </summary>
|
|
/// <param name="blockID"></param>
|
|
/// <returns></returns>
|
|
private static Color GetBlockColor(byte blockID)
|
|
{
|
|
// These map your BiomePalette selections to actual visual colors!
|
|
if (blockID == BlockRegistry.SAND) return new Color(0.8f, 0.7f, 0.4f);
|
|
if (blockID == BlockRegistry.SNOW) return new Color(0.9f, 0.9f, 0.9f);
|
|
if (blockID == BlockRegistry.STONE) return new Color(0.4f, 0.4f, 0.4f);
|
|
if (blockID == BlockRegistry.WASTELAND_DIRT) return new Color(0.35f, 0.25f, 0.25f);
|
|
if (blockID == BlockRegistry.ASPHALT) return new Color(0.15f, 0.15f, 0.15f);
|
|
|
|
// Grass variations
|
|
if (blockID == BlockRegistry.GRASS_JUNGLE) return new Color(0.1f, 0.4f, 0.1f);
|
|
if (blockID == BlockRegistry.GRASS_PARADISE) return new Color(0.4f, 0.8f, 0.4f);
|
|
if (blockID == BlockRegistry.GRASS_TROPICAL) return new Color(0.2f, 0.6f, 0.2f);
|
|
|
|
// Default Dirt
|
|
return new Color(0.4f, 0.3f, 0.15f);
|
|
}
|
|
|
|
/// <summary>
|
|
/// A deterministic, integer-based key for our Dictionary welder.
|
|
/// </summary>
|
|
private struct EdgeKey : IEquatable<EdgeKey>
|
|
{
|
|
public Vector3I P1, P2;
|
|
public EdgeKey(Vector3I p1, Vector3I p2)
|
|
{
|
|
// Always order them from lowest to highest so neighboring chunks generate the exact same key!
|
|
if (p1.X < p2.X || (p1.X == p2.X && p1.Y < p2.Y) || (p1.X == p2.X && p1.Y == p2.Y && p1.Z < p2.Z)) {
|
|
P1 = p1; P2 = p2;
|
|
} else {
|
|
P1 = p2; P2 = p1;
|
|
}
|
|
}
|
|
public bool Equals(EdgeKey other) => P1.Equals(other.P1) && P2.Equals(other.P2);
|
|
public override int GetHashCode() => HashCode.Combine(P1, P2);
|
|
}
|
|
|
|
public static Vector3 VertexInterp(float isolevel, Vector3 p1, Vector3 p2, float valp1, float valp2)
|
|
{
|
|
if (Mathf.Abs(isolevel - valp1) < 0.00001f) return p1;
|
|
if (Mathf.Abs(isolevel - valp2) < 0.00001f) return p2;
|
|
if (Mathf.Abs(valp1 - valp2) < 0.00001f) return p1;
|
|
|
|
float mu = (isolevel - valp1) / (valp2 - valp1);
|
|
|
|
return new Vector3(
|
|
p1.X + mu * (p2.X - p1.X),
|
|
p1.Y + mu * (p2.Y - p1.Y),
|
|
p1.Z + mu * (p2.Z - p1.Z)
|
|
);
|
|
}
|
|
/// <summary>
|
|
/// Calculates the exact 3D slope (gradient) of the terrain at a specific grid coordinate.
|
|
/// </summary>
|
|
public static Vector3 GetDensityGradient(float[,,] field, int x, int y, int z)
|
|
{
|
|
// Clamp to valid array indices so we don't crash when checking the chunk borders
|
|
int x0 = Math.Max(0, x - 1), x1 = Math.Min(field.GetLength(0) - 1, x + 1);
|
|
int y0 = Math.Max(0, y - 1), y1 = Math.Min(field.GetLength(1) - 1, y + 1);
|
|
int z0 = Math.Max(0, z - 1), z1 = Math.Min(field.GetLength(2) - 1, z + 1);
|
|
|
|
// Calculate the difference in density across the X, Y, and Z axes
|
|
float gx = field[x1, y, z] - field[x0, y, z];
|
|
float gy = field[x, y1, z] - field[x, y0, z];
|
|
float gz = field[x, y, z1] - field[x, y, z0];
|
|
|
|
return new Vector3(gx, gy, gz).Normalized();
|
|
}
|
|
|
|
public static ArrayMesh GenerateMesh(float[,,] scalarField, byte[,,] blockIDs, float isolevel = 0.0f, float voxelScale = 1.0f)
|
|
{
|
|
var st = new SurfaceTool();
|
|
st.Begin(Mesh.PrimitiveType.Triangles);
|
|
st.SetSmoothGroup(1);
|
|
|
|
int width = scalarField.GetLength(0) - 1;
|
|
int height = scalarField.GetLength(1) - 1;
|
|
int depth = scalarField.GetLength(2) - 1;
|
|
|
|
float[] cornerDensities = new float[8];
|
|
int[] edgeVertexIndices = new int[12]; // We now store the integer index, not the raw Vector3!
|
|
|
|
// The bulletproof integer welder
|
|
Dictionary<EdgeKey, int> vertexCache = new Dictionary<EdgeKey, int>();
|
|
int currentIndex = 0;
|
|
int totalIndicesDrawn = 0; // For our diagnostic ratio
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|
|
|
for (int x = 0; x < width; x++)
|
|
{
|
|
for (int y = 0; y < height; y++)
|
|
{
|
|
for (int z = 0; z < depth; z++)
|
|
{
|
|
cornerDensities[0] = scalarField[x, y, z];
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cornerDensities[1] = scalarField[x + 1, y, z];
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cornerDensities[2] = scalarField[x + 1, y, z + 1];
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cornerDensities[3] = scalarField[x, y, z + 1];
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cornerDensities[4] = scalarField[x, y + 1, z];
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cornerDensities[5] = scalarField[x + 1, y + 1, z];
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|
cornerDensities[6] = scalarField[x + 1, y + 1, z + 1];
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cornerDensities[7] = scalarField[x, y + 1, z + 1];
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|
|
|
int cubeIndex = 0;
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|
if (cornerDensities[0] < isolevel) cubeIndex |= 1;
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if (cornerDensities[1] < isolevel) cubeIndex |= 2;
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|
if (cornerDensities[2] < isolevel) cubeIndex |= 4;
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|
if (cornerDensities[3] < isolevel) cubeIndex |= 8;
|
|
if (cornerDensities[4] < isolevel) cubeIndex |= 16;
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|
if (cornerDensities[5] < isolevel) cubeIndex |= 32;
|
|
if (cornerDensities[6] < isolevel) cubeIndex |= 64;
|
|
if (cornerDensities[7] < isolevel) cubeIndex |= 128;
|
|
|
|
if (EdgeTable[cubeIndex] == 0) continue;
|
|
|
|
Vector3 basePos = new Vector3(x, y, z) * voxelScale;
|
|
|
|
// Calculate the 12 edges
|
|
for (int i = 0; i < 12; i++)
|
|
{
|
|
if ((EdgeTable[cubeIndex] & (1 << i)) != 0)
|
|
{
|
|
int cornerA = EdgeConnections[i, 0];
|
|
int cornerB = EdgeConnections[i, 1];
|
|
|
|
// Create the flawless integer key
|
|
Vector3I gridPosA = new Vector3I(x + (int)CornerOffsets[cornerA].X, y + (int)CornerOffsets[cornerA].Y, z + (int)CornerOffsets[cornerA].Z);
|
|
Vector3I gridPosB = new Vector3I(x + (int)CornerOffsets[cornerB].X, y + (int)CornerOffsets[cornerB].Y, z + (int)CornerOffsets[cornerB].Z);
|
|
EdgeKey key = new EdgeKey(gridPosA, gridPosB);
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|
|
|
// If this edge hasn't been drawn by a neighbor yet, calculate it and cache it!
|
|
if (!vertexCache.TryGetValue(key, out int vertIdx))
|
|
{
|
|
// 1. Calculate precise position
|
|
Vector3 exactPos = basePos + VertexInterp(isolevel, CornerOffsets[cornerA] * voxelScale, CornerOffsets[cornerB] * voxelScale, cornerDensities[cornerA], cornerDensities[cornerB]);
|
|
|
|
// 2. ANALYTICAL NORMALS: Calculate the exact 3D slope at both corners
|
|
Vector3 gradA = GetDensityGradient(scalarField, x + (int)CornerOffsets[cornerA].X, y + (int)CornerOffsets[cornerA].Y, z + (int)CornerOffsets[cornerA].Z);
|
|
Vector3 gradB = GetDensityGradient(scalarField, x + (int)CornerOffsets[cornerB].X, y + (int)CornerOffsets[cornerB].Y, z + (int)CornerOffsets[cornerB].Z);
|
|
|
|
// 3. Interpolate the normal using the exact same fraction used for the position
|
|
float valA = cornerDensities[cornerA];
|
|
float valB = cornerDensities[cornerB];
|
|
float mu = (isolevel - valA) / (valB - valA);
|
|
Vector3 exactNormal = (gradA + mu * (gradB - gradA)).Normalized();
|
|
|
|
// 4. THE COLOR FIX: Grab the BlockID from CornerA and paint the vertex!
|
|
// (We just reuse the gridPosA we already declared above the if-statement!)
|
|
byte blockID = blockIDs[gridPosA.X, gridPosA.Y, gridPosA.Z];
|
|
|
|
st.SetColor(GetBlockColor(blockID));
|
|
|
|
// 5. Feed the perfect normal AND the position to Godot!
|
|
// (SetColor and SetNormal MUST be called immediately before AddVertex)
|
|
st.SetNormal(exactNormal);
|
|
st.AddVertex(exactPos);
|
|
|
|
// 6. Cache it so neighbors don't redraw it!
|
|
vertIdx = currentIndex++;
|
|
vertexCache[key] = vertIdx;
|
|
}
|
|
|
|
// Save the index for this specific cube to use in the TriTable
|
|
edgeVertexIndices[i] = vertIdx;
|
|
}
|
|
}
|
|
|
|
// Connect the cached indices!
|
|
for (int i = 0; TriTable[cubeIndex, i] != -1; i += 3)
|
|
{
|
|
st.AddIndex(edgeVertexIndices[TriTable[cubeIndex, i + 2]]);
|
|
st.AddIndex(edgeVertexIndices[TriTable[cubeIndex, i + 1]]);
|
|
st.AddIndex(edgeVertexIndices[TriTable[cubeIndex, i]]);
|
|
totalIndicesDrawn += 3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Diagnostic Print
|
|
// GD.Print($"[MarchingCubes] Vertices: {currentIndex}, Indices: {totalIndicesDrawn}, Ratio: {(float)totalIndicesDrawn / Math.Max(1, currentIndex):F2}");
|
|
|
|
return st.Commit();
|
|
}
|
|
}
|
|
|
|
} |