Marching Cubes creates holes

Multi · October 12, 2025, 12:25pm

Godot Version

4.5 stable

Question

Hello everyone,

I have a problem where my Marching cubes algorythm leaves holes in the mesh. Each hole is a perfectly vertical or horizontal rectangle. I know I’m doing it a bit different than usual and my code is still very crude but I’m not entirely sure what I’m doing wrong. On one hand I (think I) understand what’s going on and already are working on a workaround but is this normal or am I doing something wrong?

@export var noise := FastNoiseLite.new()

const SIZE : int = 32
var SCALE : float = 1.0
var curCol := Color.RED

@export var recalculate: bool = false:
set(inVal):
if recalculate: return
recalculate = inVal
GenerateMesh()
recalculate = false

const EdgeVertexPos : Array = [
Vector3( 0.0, -0.5, -0.5),
Vector3( 0.5, 0.0, -0.5),
Vector3( 0.0, 0.5, -0.5),
Vector3(-0.5, 0.0, -0.5),
Vector3( 0.0, -0.5, 0.5),
Vector3( 0.5, 0.0, 0.5),
Vector3( 0.0, 0.5, 0.5),
Vector3(-0.5, 0.0, 0.5),
Vector3(-0.5, -0.5, 0.0),
Vector3( 0.5, -0.5, 0.0),
Vector3( 0.5, 0.5, 0.0),
Vector3(-0.5, 0.5, 0.0)
]

const EdgeMasks := [
0x0, 0x109, 0x203, 0x30a, 0x80c, 0x905, 0xa0f, 0xb06,
0x406, 0x50f, 0x605, 0x70c, 0xc0a, 0xd03, 0xe09, 0xf00,
0x190, 0x99, 0x393, 0x29a, 0x99c, 0x895, 0xb9f, 0xa96,
0x596, 0x49f, 0x795, 0x69c, 0xd9a, 0xc93, 0xf99, 0xe90,
0x230, 0x339, 0x33, 0x13a, 0xa3c, 0xb35, 0x83f, 0x936,
0x636, 0x73f, 0x435, 0x53c, 0xe3a, 0xf33, 0xc39, 0xd30,
0x3a0, 0x2a9, 0x1a3, 0xaa, 0xbac, 0xaa5, 0x9af, 0x8a6,
0x7a6, 0x6af, 0x5a5, 0x4ac, 0xfaa, 0xea3, 0xda9, 0xca0,
0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc, 0x1c5, 0x2cf, 0x3c6,
0xcc6, 0xdcf, 0xec5, 0xfcc, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
0x950, 0x859, 0xb53, 0xa5a, 0x15c, 0x55, 0x35f, 0x256,
0xd56, 0xc5f, 0xf55, 0xe5c, 0x55a, 0x453, 0x759, 0x650,
0xaf0, 0xbf9, 0x8f3, 0x9fa, 0x2fc, 0x3f5, 0xff, 0x1f6,
0xef6, 0xfff, 0xcf5, 0xdfc, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
0xb60, 0xa69, 0x963, 0x86a, 0x36c, 0x265, 0x16f, 0x66,
0xf66, 0xe6f, 0xd65, 0xc6c, 0x76a, 0x663, 0x569, 0x460,
0x460, 0x569, 0x663, 0x76a, 0xc6c, 0xd65, 0xe6f, 0xf66,
0x66, 0x16f, 0x265, 0x36c, 0x86a, 0x963, 0xa69, 0xb60,
0x5f0, 0x4f9, 0x7f3, 0x6fa, 0xdfc, 0xcf5, 0xfff, 0xef6,
0x1f6, 0xff, 0x3f5, 0x2fc, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
0x650, 0x759, 0x453, 0x55a, 0xe5c, 0xf55, 0xc5f, 0xd56,
0x256, 0x35f, 0x55, 0x15c, 0xa5a, 0xb53, 0x859, 0x950,
0x7c0, 0x6c9, 0x5c3, 0x4ca, 0xfcc, 0xec5, 0xdcf, 0xcc6,
0x3c6, 0x2cf, 0x1c5, 0xcc, 0xbca, 0xac3, 0x9c9, 0x8c0,
0xca0, 0xda9, 0xea3, 0xfaa, 0x4ac, 0x5a5, 0x6af, 0x7a6,
0x8a6, 0x9af, 0xaa5, 0xbac, 0xaa, 0x1a3, 0x2a9, 0x3a0,
0xd30, 0xc39, 0xf33, 0xe3a, 0x53c, 0x435, 0x73f, 0x636,
0x936, 0x83f, 0xb35, 0xa3c, 0x13a, 0x33, 0x339, 0x230,
0xe90, 0xf99, 0xc93, 0xd9a, 0x69c, 0x795, 0x49f, 0x596,
0xa96, 0xb9f, 0x895, 0x99c, 0x29a, 0x393, 0x99, 0x190,
0xf00, 0xe09, 0xd03, 0xc0a, 0x70c, 0x605, 0x50f, 0x406,
0xb06, 0xa0f, 0x905, 0x80c, 0x30a, 0x203, 0x109, 0x0,
];

const TriangleTable := [
Array([ -1 ]),
Array([ 0, 3, 8, -1 ]),
Array([ 0, 9, 1, -1 ]),
Array([ 3, 8, 1, 1, 8, 9, -1 ]),
Array([ 2, 11, 3, -1 ]),
Array([ 8, 0, 11, 11, 0, 2, -1 ]),
Array([ 3, 2, 11, 1, 0, 9, -1 ]),
Array([ 11, 1, 2, 11, 9, 1, 11, 8, 9, -1 ]),
Array([ 1, 10, 2, -1 ]),
Array([ 0, 3, 8, 2, 1, 10, -1 ]),
Array([ 10, 2, 9, 9, 2, 0, -1 ]),
Array([ 8, 2, 3, 8, 10, 2, 8, 9, 10, -1 ]),
Array([ 11, 3, 10, 10, 3, 1, -1 ]),
Array([ 10, 0, 1, 10, 8, 0, 10, 11, 8, -1 ]),
Array([ 9, 3, 0, 9, 11, 3, 9, 10, 11, -1 ]),
Array([ 8, 9, 11, 11, 9, 10, -1 ]),
Array([ 4, 8, 7, -1 ]),
Array([ 7, 4, 3, 3, 4, 0, -1 ]),
Array([ 4, 8, 7, 0, 9, 1, -1 ]),#18: Inverse
Array([ 1, 4, 9, 1, 7, 4, 1, 3, 7, -1 ]),
Array([ 8, 7, 4, 11, 3, 2, -1 ]),
Array([ 4, 11, 7, 4, 2, 11, 4, 0, 2, -1 ]),
Array([ 0, 9, 1, 8, 7, 4, 11, 3, 2, -1 ]),
Array([ 7, 4, 11, 11, 4, 2, 2, 4, 9, 2, 9, 1, -1 ]),
Array([ 4, 8, 7, 2, 1, 10, -1 ]),
Array([ 7, 4, 3, 3, 4, 0, 10, 2, 1, -1 ]),
Array([ 10, 2, 9, 9, 2, 0, 7, 4, 8, -1 ]),
Array([ 10, 2, 3, 10, 3, 4, 3, 7, 4, 9, 10, 4, -1 ]),
Array([ 1, 10, 3, 3, 10, 11, 4, 8, 7, -1 ]),
Array([ 10, 11, 1, 11, 7, 4, 1, 11, 4, 1, 4, 0, -1 ]),
Array([ 7, 4, 8, 9, 3, 0, 9, 11, 3, 9, 10, 11, -1 ]),
Array([ 7, 4, 11, 4, 9, 11, 9, 10, 11, -1 ]),
Array([ 9, 4, 5, -1 ]),
Array([ 9, 4, 5, 8, 0, 3, -1 ]),
Array([ 4, 5, 0, 0, 5, 1, -1 ]),
Array([ 5, 8, 4, 5, 3, 8, 5, 1, 3, -1 ]),
Array([ 9, 4, 5, 11, 3, 2, -1 ]),
Array([ 2, 11, 0, 0, 11, 8, 5, 9, 4, -1 ]),
Array([ 4, 5, 0, 0, 5, 1, 11, 3, 2, -1 ]),
Array([ 5, 1, 4, 1, 2, 11, 4, 1, 11, 4, 11, 8, -1 ]),
Array([ 1, 10, 2, 5, 9, 4, -1 ]),
Array([ 9, 4, 5, 0, 3, 8, 2, 1, 10, -1 ]),
Array([ 2, 5, 10, 2, 4, 5, 2, 0, 4, -1 ]),
Array([ 10, 2, 5, 5, 2, 4, 4, 2, 3, 4, 3, 8, -1 ]),
Array([ 11, 3, 10, 10, 3, 1, 4, 5, 9, -1 ]),
Array([ 4, 5, 9, 10, 0, 1, 10, 8, 0, 10, 11, 8, -1 ]),
Array([ 11, 3, 0, 11, 0, 5, 0, 4, 5, 10, 11, 5, -1 ]),
Array([ 4, 5, 8, 5, 10, 8, 10, 11, 8, -1 ]),
Array([ 8, 7, 9, 9, 7, 5, -1 ]),
Array([ 3, 9, 0, 3, 5, 9, 3, 7, 5, -1 ]),
Array([ 7, 0, 8, 7, 1, 0, 7, 5, 1, -1 ]),
Array([ 7, 5, 3, 3, 5, 1, -1 ]),
Array([ 5, 9, 7, 7, 9, 8, 2, 11, 3, -1 ]),
Array([ 2, 11, 7, 2, 7, 9, 7, 5, 9, 0, 2, 9, -1 ]),
Array([ 2, 11, 3, 7, 0, 8, 7, 1, 0, 7, 5, 1, -1 ]),
Array([ 2, 11, 1, 11, 7, 1, 7, 5, 1, -1 ]),
Array([ 8, 7, 9, 9, 7, 5, 2, 1, 10, -1 ]),
Array([ 10, 2, 1, 3, 9, 0, 3, 5, 9, 3, 7, 5, -1 ]),
Array([ 7, 5, 8, 5, 10, 2, 8, 5, 2, 8, 2, 0, -1 ]),
Array([ 10, 2, 5, 2, 3, 5, 3, 7, 5, -1 ]),
Array([ 8, 7, 5, 8, 5, 9, 11, 3, 10, 3, 1, 10, -1 ]),
Array([ 5, 11, 7, 10, 11, 5, 1, 9, 0, -1 ]),
Array([ 11, 5, 10, 7, 5, 11, 8, 3, 0, -1 ]),
Array([ 5, 11, 7, 10, 11, 5, -1 ]),
Array([ 6, 7, 11, -1 ]),
Array([ 7, 11, 6, 3, 8, 0, -1 ]),#65:?
Array([ 6, 7, 11, 0, 9, 1, -1 ]),
Array([ 9, 1, 8, 8, 1, 3, 6, 7, 11, -1 ]),
Array([ 3, 2, 7, 7, 2, 6, -1 ]),
Array([ 0, 7, 8, 0, 6, 7, 0, 2, 6, -1 ]),
Array([ 6, 7, 2, 2, 7, 3, 9, 1, 0, -1 ]),
Array([ 6, 7, 8, 6, 8, 1, 8, 9, 1, 2, 6, 1, -1 ]),
Array([ 11, 6, 7, 10, 2, 1, -1 ]),
Array([ 3, 8, 0, 11, 6, 7, 10, 2, 1, -1 ]),
Array([ 0, 9, 2, 2, 9, 10, 7, 11, 6, -1 ]),
Array([ 6, 7, 11, 8, 2, 3, 8, 10, 2, 8, 9, 10, -1 ]),
Array([ 7, 10, 6, 7, 1, 10, 7, 3, 1, -1 ]),
Array([ 8, 0, 7, 7, 0, 6, 6, 0, 1, 6, 1, 10, -1 ]),
Array([ 7, 3, 6, 3, 0, 9, 6, 3, 9, 6, 9, 10, -1 ]),
Array([ 6, 7, 10, 7, 8, 10, 8, 9, 10, -1 ]),
Array([ 11, 6, 8, 8, 6, 4, -1 ]),
Array([ 6, 3, 11, 6, 0, 3, 6, 4, 0, -1 ]),
Array([ 11, 6, 8, 8, 6, 4, 1, 0, 9, -1 ]),
Array([ 1, 3, 9, 3, 11, 6, 9, 3, 6, 9, 6, 4, -1 ]),
Array([ 2, 8, 3, 2, 4, 8, 2, 6, 4, -1 ]),
Array([ 4, 0, 6, 6, 0, 2, -1 ]),
Array([ 9, 1, 0, 2, 8, 3, 2, 4, 8, 2, 6, 4, -1 ]),
Array([ 9, 1, 4, 1, 2, 4, 2, 6, 4, -1 ]),
Array([ 4, 8, 6, 6, 8, 11, 1, 10, 2, -1 ]),
Array([ 1, 10, 2, 6, 3, 11, 6, 0, 3, 6, 4, 0, -1 ]),
Array([ 11, 6, 4, 11, 4, 8, 10, 2, 9, 2, 0, 9, -1 ]),
Array([ 10, 4, 9, 6, 4, 10, 11, 2, 3, -1 ]),
Array([ 4, 8, 3, 4, 3, 10, 3, 1, 10, 6, 4, 10, -1 ]),
Array([ 1, 10, 0, 10, 6, 0, 6, 4, 0, -1 ]),
Array([ 4, 10, 6, 9, 10, 4, 0, 8, 3, -1 ]),
Array([ 4, 10, 6, 9, 10, 4, -1 ]),
Array([ 6, 7, 11, 4, 5, 9, -1 ]), #96: 6, 7, 11, 4, 5, 9, -1
Array([ 4, 5, 9, 7, 11, 6, 3, 8, 0, -1 ]),
Array([ 1, 0, 5, 5, 0, 4, 11, 6, 7, -1 ]),
Array([ 11, 6, 7, 5, 8, 4, 5, 3, 8, 5, 1, 3, -1 ]),
Array([ 3, 2, 7, 7, 2, 6, 9, 4, 5, -1 ]),
Array([ 5, 9, 4, 0, 7, 8, 0, 6, 7, 0, 2, 6, -1 ]),
Array([ 3, 2, 6, 3, 6, 7, 1, 0, 5, 0, 4, 5, -1 ]),
Array([ 6, 1, 2, 5, 1, 6, 4, 7, 8, -1 ]),
Array([ 10, 2, 1, 6, 7, 11, 4, 5, 9, -1 ]),
Array([ 0, 3, 8, 4, 5, 9, 11, 6, 7, 10, 2, 1, -1 ]),
Array([ 7, 11, 6, 2, 5, 10, 2, 4, 5, 2, 0, 4, -1 ]),
Array([ 8, 4, 7, 5, 10, 6, 3, 11, 2, -1 ]),
Array([ 9, 4, 5, 7, 10, 6, 7, 1, 10, 7, 3, 1, -1 ]),
Array([ 10, 6, 5, 7, 8, 4, 1, 9, 0, -1 ]),
Array([ 4, 3, 0, 7, 3, 4, 6, 5, 10, -1 ]),
Array([ 10, 6, 5, 8, 4, 7, -1 ]),
Array([ 9, 6, 5, 9, 11, 6, 9, 8, 11, -1 ]),
Array([ 11, 6, 3, 3, 6, 0, 0, 6, 5, 0, 5, 9, -1 ]),
Array([ 11, 6, 5, 11, 5, 0, 5, 1, 0, 8, 11, 0, -1 ]),
Array([ 11, 6, 3, 6, 5, 3, 5, 1, 3, -1 ]),
Array([ 9, 8, 5, 8, 3, 2, 5, 8, 2, 5, 2, 6, -1 ]),
Array([ 5, 9, 6, 9, 0, 6, 0, 2, 6, -1 ]),
Array([ 1, 6, 5, 2, 6, 1, 3, 0, 8, -1 ]),
Array([ 1, 6, 5, 2, 6, 1, -1 ]),
Array([ 2, 1, 10, 9, 6, 5, 9, 11, 6, 9, 8, 11, -1 ]),
Array([ 9, 0, 1, 3, 11, 2, 5, 10, 6, -1 ]),
Array([ 11, 0, 8, 2, 0, 11, 10, 6, 5, -1 ]),
Array([ 3, 11, 2, 5, 10, 6, -1 ]),
Array([ 1, 8, 3, 9, 8, 1, 5, 10, 6, -1 ]),
Array([ 6, 5, 10, 0, 1, 9, -1 ]),#Array([ 6, 5, 10, 0, 1, 9, -1 ]), #? 5, 1, 10, 5, 9, 1
Array([ 8, 3, 0, 5, 10, 6, -1 ]),
Array([ 6, 5, 10, -1 ]),
Array([ 10, 5, 6, -1 ]),
Array([ 0, 3, 8, 6, 10, 5, -1 ]),
Array([ 10, 5, 6, 9, 1, 0, -1 ]),
Array([ 3, 8, 1, 1, 8, 9, 6, 10, 5, -1 ]),
Array([ 2, 11, 3, 6, 10, 5, -1 ]),
Array([ 8, 0, 11, 11, 0, 2, 5, 6, 10, -1 ]),
Array([ 1, 0, 9, 2, 11, 3, 6, 10, 5, -1 ]),
Array([ 5, 6, 10, 11, 1, 2, 11, 9, 1, 11, 8, 9, -1 ]),
Array([ 5, 6, 1, 1, 6, 2, -1 ]),
Array([ 5, 6, 1, 1, 6, 2, 8, 0, 3, -1 ]),
Array([ 6, 9, 5, 6, 0, 9, 6, 2, 0, -1 ]),
Array([ 6, 2, 5, 2, 3, 8, 5, 2, 8, 5, 8, 9, -1 ]),
Array([ 3, 6, 11, 3, 5, 6, 3, 1, 5, -1 ]),
Array([ 8, 0, 1, 8, 1, 6, 1, 5, 6, 11, 8, 6, -1 ]),
Array([ 11, 3, 6, 6, 3, 5, 5, 3, 0, 5, 0, 9, -1 ]),
Array([ 5, 6, 9, 6, 11, 9, 11, 8, 9, -1 ]),
Array([ 5, 6, 10, 7, 4, 8, -1 ]),
Array([ 0, 3, 4, 4, 3, 7, 10, 5, 6, -1 ]),
Array([ 5, 6, 10, 4, 8, 7, 0, 9, 1, -1 ]),
Array([ 6, 10, 5, 1, 4, 9, 1, 7, 4, 1, 3, 7, -1 ]),
Array([ 7, 4, 8, 6, 10, 5, 2, 11, 3, -1 ]),
Array([ 10, 5, 6, 4, 11, 7, 4, 2, 11, 4, 0, 2, -1 ]),
Array([ 4, 8, 7, 6, 10, 5, 3, 2, 11, 1, 0, 9, -1 ]),
Array([ 1, 2, 10, 11, 7, 6, 9, 5, 4, -1 ]),
Array([ 2, 1, 6, 6, 1, 5, 8, 7, 4, -1 ]),
Array([ 0, 3, 7, 0, 7, 4, 2, 1, 6, 1, 5, 6, -1 ]),
Array([ 8, 7, 4, 6, 9, 5, 6, 0, 9, 6, 2, 0, -1 ]),
Array([ 7, 2, 3, 6, 2, 7, 5, 4, 9, -1 ]),
Array([ 4, 8, 7, 3, 6, 11, 3, 5, 6, 3, 1, 5, -1 ]),
Array([ 5, 0, 1, 4, 0, 5, 7, 6, 11, -1 ]),
Array([ 9, 5, 4, 6, 11, 7, 0, 8, 3, -1 ]),
Array([ 11, 7, 6, 9, 5, 4, -1 ]),
Array([ 6, 10, 4, 4, 10, 9, -1 ]),
Array([ 6, 10, 4, 4, 10, 9, 3, 8, 0, -1 ]),
Array([ 0, 10, 1, 0, 6, 10, 0, 4, 6, -1 ]),
Array([ 6, 10, 1, 6, 1, 8, 1, 3, 8, 4, 6, 8, -1 ]),
Array([ 9, 4, 10, 10, 4, 6, 3, 2, 11, -1 ]),
Array([ 2, 11, 8, 2, 8, 0, 6, 10, 4, 10, 9, 4, -1 ]),
Array([ 11, 3, 2, 0, 10, 1, 0, 6, 10, 0, 4, 6, -1 ]),
Array([ 6, 8, 4, 11, 8, 6, 2, 10, 1, -1 ]),
Array([ 4, 1, 9, 4, 2, 1, 4, 6, 2, -1 ]),
Array([ 3, 8, 0, 4, 1, 9, 4, 2, 1, 4, 6, 2, -1 ]),
Array([ 6, 2, 4, 4, 2, 0, -1 ]),
Array([ 3, 8, 2, 8, 4, 2, 4, 6, 2, -1 ]),
Array([ 4, 6, 9, 6, 11, 3, 9, 6, 3, 9, 3, 1, -1 ]),
Array([ 8, 6, 11, 4, 6, 8, 9, 0, 1, -1 ]),
Array([ 11, 3, 6, 3, 0, 6, 0, 4, 6, -1 ]),
Array([ 8, 6, 11, 4, 6, 8, -1 ]),
Array([ 10, 7, 6, 10, 8, 7, 10, 9, 8, -1 ]),
Array([ 3, 7, 0, 7, 6, 10, 0, 7, 10, 0, 10, 9, -1 ]),
Array([ 6, 10, 7, 7, 10, 8, 8, 10, 1, 8, 1, 0, -1 ]),
Array([ 6, 10, 7, 10, 1, 7, 1, 3, 7, -1 ]),
Array([ 3, 2, 11, 10, 7, 6, 10, 8, 7, 10, 9, 8, -1 ]),
Array([ 2, 9, 0, 10, 9, 2, 6, 11, 7, -1 ]),
Array([ 0, 8, 3, 7, 6, 11, 1, 2, 10, -1 ]),
Array([ 7, 6, 11, 1, 2, 10, -1 ]),
Array([ 2, 1, 9, 2, 9, 7, 9, 8, 7, 6, 2, 7, -1 ]),
Array([ 2, 7, 6, 3, 7, 2, 0, 1, 9, -1 ]),
Array([ 8, 7, 0, 7, 6, 0, 6, 2, 0, -1 ]),
Array([ 7, 2, 3, 6, 2, 7, -1 ]),
Array([ 8, 1, 9, 3, 1, 8, 11, 7, 6, -1 ]),
Array([ 11, 7, 6, 1, 9, 0, -1 ]),
Array([ 6, 11, 7, 0, 8, 3, -1 ]),#190: Array([ 6, 11, 7, 0, 8, 3, -1 ]), #11,8,7, 8,11,3
Array([ 11, 7, 6, -1 ]),
Array([ 7, 11, 5, 5, 11, 10, -1 ]),
Array([ 10, 5, 11, 11, 5, 7, 0, 3, 8, -1 ]),
Array([ 7, 11, 5, 5, 11, 10, 0, 9, 1, -1 ]),
Array([ 7, 11, 10, 7, 10, 5, 3, 8, 1, 8, 9, 1, -1 ]),
Array([ 5, 2, 10, 5, 3, 2, 5, 7, 3, -1 ]),
Array([ 5, 7, 10, 7, 8, 0, 10, 7, 0, 10, 0, 2, -1 ]),
Array([ 0, 9, 1, 5, 2, 10, 5, 3, 2, 5, 7, 3, -1 ]),
Array([ 9, 7, 8, 5, 7, 9, 10, 1, 2, -1 ]),
Array([ 1, 11, 2, 1, 7, 11, 1, 5, 7, -1 ]),
Array([ 8, 0, 3, 1, 11, 2, 1, 7, 11, 1, 5, 7, -1 ]),
Array([ 7, 11, 2, 7, 2, 9, 2, 0, 9, 5, 7, 9, -1 ]),
Array([ 7, 9, 5, 8, 9, 7, 3, 11, 2, -1 ]),
Array([ 3, 1, 7, 7, 1, 5, -1 ]),
Array([ 8, 0, 7, 0, 1, 7, 1, 5, 7, -1 ]),
Array([ 0, 9, 3, 9, 5, 3, 5, 7, 3, -1 ]),
Array([ 9, 7, 8, 5, 7, 9, -1 ]),
Array([ 8, 5, 4, 8, 10, 5, 8, 11, 10, -1 ]),
Array([ 0, 3, 11, 0, 11, 5, 11, 10, 5, 4, 0, 5, -1 ]),
Array([ 1, 0, 9, 8, 5, 4, 8, 10, 5, 8, 11, 10, -1 ]),
Array([ 10, 3, 11, 1, 3, 10, 9, 5, 4, -1 ]),
Array([ 3, 2, 8, 8, 2, 4, 4, 2, 10, 4, 10, 5, -1 ]),
Array([ 10, 5, 2, 5, 4, 2, 4, 0, 2, -1 ]),
Array([ 5, 4, 9, 8, 3, 0, 10, 1, 2, -1 ]),
Array([ 2, 10, 1, 4, 9, 5, -1 ]), #215: Array([ 2, 10, 1, 4, 9, 5, -1 ]),# 10,9,1, 10,5,9,
Array([ 8, 11, 4, 11, 2, 1, 4, 11, 1, 4, 1, 5, -1 ]),
Array([ 0, 5, 4, 1, 5, 0, 2, 3, 11, -1 ]),
Array([ 0, 11, 2, 8, 11, 0, 4, 9, 5, -1 ]),
Array([ 5, 4, 9, 2, 3, 11, -1 ]),
Array([ 4, 8, 5, 8, 3, 5, 3, 1, 5, -1 ]),
Array([ 0, 5, 4, 1, 5, 0, -1 ]),
Array([ 5, 4, 9, 3, 0, 8, -1 ]),#222: Array([ 5, 4, 9, 3, 0, 8, -1 ]), # 4,0,9, 0,4,9
Array([ 5, 4, 9, -1 ]),
Array([ 11, 4, 7, 11, 9, 4, 11, 10, 9, -1 ]),
Array([ 0, 3, 8, 11, 4, 7, 11, 9, 4, 11, 10, 9, -1 ]),
Array([ 11, 10, 7, 10, 1, 0, 7, 10, 0, 7, 0, 4, -1 ]),
Array([ 3, 10, 1, 11, 10, 3, 7, 8, 4, -1 ]),
Array([ 3, 2, 10, 3, 10, 4, 10, 9, 4, 7, 3, 4, -1 ]),
Array([ 9, 2, 10, 0, 2, 9, 8, 4, 7, -1 ]),
Array([ 3, 4, 7, 0, 4, 3, 1, 2, 10, -1 ]),
Array([ 7, 8, 4, 10, 1, 2, -1 ]),
Array([ 7, 11, 4, 4, 11, 9, 9, 11, 2, 9, 2, 1, -1 ]),
Array([ 1, 9, 0, 4, 7, 8, 2, 3, 11, -1 ]),
Array([ 7, 11, 4, 11, 2, 4, 2, 0, 4, -1 ]),
Array([ 4, 7, 8, 2, 3, 11, -1 ]),#235: Array([ 4, 7, 8, 2, 3, 11, -1 ]), 7,3,8, 7,11,3,
Array([ 9, 4, 1, 4, 7, 1, 7, 3, 1, -1 ]),
Array([ 7, 8, 4, 1, 9, 0, -1 ]),#237: Array([ 7, 8, 4, 1, 9, 0, -1 ]), #4,8,9, 8,0,9
Array([ 3, 4, 7, 0, 4, 3, -1 ]),
Array([ 7, 8, 4, -1 ]),
Array([ 11, 10, 8, 8, 10, 9, -1 ]),
Array([ 0, 3, 9, 3, 11, 9, 11, 10, 9, -1 ]),
Array([ 1, 0, 10, 0, 8, 10, 8, 11, 10, -1 ]),
Array([ 10, 3, 11, 1, 3, 10, -1 ]),
Array([ 3, 2, 8, 2, 10, 8, 10, 9, 8, -1 ]),
Array([ 9, 2, 10, 0, 2, 9, -1 ]),
Array([ 8, 3, 0, 10, 1, 2, -1 ]), #246: Array([ 8, 3, 0, 10, 1, 2, -1 ]), #0,3,1, 1,3,2,
Array([ 2, 10, 1, -1 ]),
Array([ 2, 1, 11, 1, 9, 11, 9, 8, 11, -1 ]),
Array([ 11, 2, 3, 9, 0, 1, -1 ]),
Array([ 11, 0, 8, 2, 0, 11, -1 ]),
Array([ 3, 11, 2, -1 ]),
Array([ 1, 8, 3, 9, 8, 1, -1 ]),
Array([ 1, 9, 0, -1 ]),
Array([ 8, 3, 0, -1 ]),
Array([ -1 ])
]

func IsSolid(globalPos: Vector3) → int:
return int(noise.get_noise_3dv(globalPos) < 0.0)

func GetIDX(localPos: Vector3) → int:
localPos = to_global(localPos)
return (IsSolid(localPos) | IsSolid(localPos + Vector3(1,0,0)) << 1 | IsSolid(localPos + Vector3(0,1,0)) << 2 | IsSolid(localPos + Vector3(1,1,0)) << 3 | IsSolid(localPos + Vector3(0,0,1)) << 4 | IsSolid(localPos + Vector3(1,0,1)) << 5 | IsSolid(localPos + Vector3(0,1,1)) << 6 | IsSolid(localPos + Vector3(1,1,1)) << 7)

func GetColor() → Color:
if curCol == Color.RED: curCol = Color.GREEN
elif curCol == Color.GREEN: curCol = Color.BLUE
else: curCol = Color.RED
return curCol

func GenerateMeshArray() → Array:
var ret: Array =
ret.resize(Mesh.ARRAY_MAX)

var verts : PackedVector3Array =
var indices : PackedInt32Array =
var norms : PackedVector3Array =
var cols : PackedColorArray =

var hSize : float = float(SIZE / 2)
if SIZE & 1 > 0: hSize += 0.5
var startPos : Vector3 = position - Vector3(hSize,hSize,hSize) #3.5

for z in range(SIZE):
for y in range(SIZE):
for x in range(SIZE):
var curPos := startPos + Vector3(x,y,z)
var idx : int = GetIDX(curPos)
var vertIDX : Array = TriangleTable[idx]
for vert in vertIDX:
if vert < 0: break
var vertex : Vector3 = curPos + EdgeVertexPos[vert]
indices.append(verts.size())
verts.append(vertex)
norms.append(vertex.normalized())
cols.append(GetColor())

ret[Mesh.ARRAY_VERTEX] = verts
ret[Mesh.ARRAY_INDEX] = indices
ret[Mesh.ARRAY_NORMAL] = norms
ret[Mesh.ARRAY_COLOR] = cols

return ret

func _ready() → void:
var meshInst := MeshInstance3D.new()
meshInst.mesh = ArrayMesh.new()
add_child(meshInst)

func GenerateMesh() → void:

print(TriangleTable[15])
print(TriangleTable[240])

var meshInst : MeshInstance3D = get_child(0)
var mesh : ArrayMesh = meshInst.mesh
mesh.clear_surfaces()
mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, GenerateMeshArray())
#meshInst.create_debug_tangents()

Since this seems to only happen with certain configurations for now I will be trying to check for these cases and insert faces if needed, but since nobody else seems to have this issue I’d like if someone could spare me the effort.

THX in advance

Multi · October 14, 2025, 12:29am

Solved it:

For everyone trying Marching cubes and looking for a lookup table:
Just use Polygonising a scalar field (Marching Cubes)
The table I used (github) was off or I misunderstand it.

system · November 13, 2025, 12:30am

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