Array Index Specification Confusion

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1

Godot Version

4

This might be a simple one… I’m reading through the ArrayMesh tutorial https://docs.godotengine.org/en/stable/tutorials/3d/procedural_geometry/arraymesh.html

and am wondering how GDScript knows what index is being referred to here:

surface_array[Mesh.ARRAY_VERTEX] = verts
surface_array[Mesh.ARRAY_TEX_UV] = uvs
surface_array[Mesh.ARRAY_NORMAL] = normals
surface_array[Mesh.ARRAY_INDEX] = indices

# No blendshapes, lods, or compression used.
mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, surface_array)

How does it know Mesh.XXX_XXXXX corresponds to an array element? I see in the C# portion these are converted to (int) which makes sense to me because array indices are ints. (I am brand new to Godot feel free to refer me to another topic)

2

Its part of an enumeration, i.e. they are integers.

enum ArrayType {
 ARRAY_VERTEX = 0,
 ARRAY_NORMAL = 1,
 ARRAY_TANGENT = 2,
 ARRAY_COLOR = 3,
 ARRAY_TEX_UV = 4,
 ARRAY_TEX_UV2 = 5,
 ARRAY_CUSTOM0 = 6,
 ARRAY_CUSTOM1 = 7,
 ARRAY_CUSTOM2 = 8,
 ARRAY_CUSTOM3 = 9,
 ARRAY_BONES = 10,
 ARRAY_WEIGHTS = 11,
 ARRAY_INDEX = 12,
 ARRAY_MAX
}
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