88 lines
2.2 KiB
GDScript
88 lines
2.2 KiB
GDScript
@tool
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extends ArrayMesh
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class_name PortalBoxMesh
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@export var size: Vector3 = Vector3(1, 1, 1):
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set(v):
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size = v
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generate_portal_mesh()
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func _init() -> void:
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if Engine.is_editor_hint():
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generate_portal_mesh()
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func generate_portal_mesh() -> void:
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var _start_time: int = Time.get_ticks_usec()
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clear_surfaces() # Reset
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var surface_array: Array = []
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surface_array.resize(Mesh.ARRAY_MAX)
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var verts: PackedVector3Array = PackedVector3Array()
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var uvs: PackedVector2Array = PackedVector2Array()
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var normals: PackedVector3Array = PackedVector3Array()
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var indices: PackedInt32Array = PackedInt32Array()
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# Just to save some chars
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var w: float = size.x / 2
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var h: float = size.y / 2
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var depth: Vector3 = Vector3(0, 0, -size.z)
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# Outside rect
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var TOP_LEFT: Vector3 = Vector3(-w, h, 0)
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var TOP_RIGHT: Vector3 = Vector3(w, h, 0)
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var BOTTOM_LEFT: Vector3 = Vector3(-w, -h, 0)
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var BOTTOM_RIGHT: Vector3 = Vector3(w, -h, 0)
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verts.append_array([
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TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT,
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TOP_LEFT + depth, TOP_RIGHT + depth, BOTTOM_LEFT + depth, BOTTOM_RIGHT + depth,
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])
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uvs.append_array([
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Vector2(0, 0), Vector2(1, 0), Vector2(0, 1), Vector2(1, 1), # Front UVs
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Vector2(0, 0), Vector2(1, 0), Vector2(0, 1), Vector2(1, 1), # Back UVs (the same)
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])
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# We are going for a flat-surface look here. Portals should be unshaded anyways.
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normals.append_array([
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Vector3.BACK, Vector3.BACK, Vector3.BACK, Vector3.BACK,
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Vector3.BACK, Vector3.BACK, Vector3.BACK, Vector3.BACK
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])
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# 0 ----------- 1
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# | \ / |
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# | 4-------5 |
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# | | | |
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# | | | |
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# | 6-------7 |
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# | / \ |
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# 2 ----------- 3
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# Triangles are clockwise!
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indices.append_array([
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0, 1, 4,
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4, 1, 5, # Top section done
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1, 3, 5,
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5, 3, 7, # right section done
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3, 2, 7,
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7, 2, 6, # bottom section done
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2, 0, 6,
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6, 0, 4, # left section done
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4, 5, 6,
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6, 5, 7, # back section done
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0, 1, 2,
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2, 1, 3, # front section done
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])
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surface_array[Mesh.ARRAY_VERTEX] = verts
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surface_array[Mesh.ARRAY_TEX_UV] = uvs
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surface_array[Mesh.ARRAY_NORMAL] = normals
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surface_array[Mesh.ARRAY_INDEX] = indices
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add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, surface_array)
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