88 lines
3.9 KiB
GDScript
88 lines
3.9 KiB
GDScript
extends MeshInstance3D
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class_name MyPortal
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## My own portal implementation
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@export var exit_portal: MyPortal
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#preload("res://scripts/my_portal_material.tres")
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const MY_PORTAL_MATERIAL = preload("uid://cwobk5ik5k5aj")
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var _viewport: SubViewport
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var _camera: Camera3D = Camera3D.new()
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var _main_camera: Camera3D = null
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var exit_scale: int = 1 # This is not really needed I think
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func _ready() -> void:
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assert(exit_portal != null)
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_main_camera = get_viewport().get_camera_3d()
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# NOTE: In case the exit portal is in a different world, better put the viewport and camera
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# onto IT, rather than me (?)
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_viewport = SubViewport.new()
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_viewport.name = name + "_Viewport"
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_viewport.size = get_viewport().size
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add_child(_viewport)
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_camera.name = name + "_ExitCamera"
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_viewport.add_child(_camera)
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var mat: ShaderMaterial = MY_PORTAL_MATERIAL
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material_override = mat
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mat.set_shader_parameter("albedo", _viewport.get_texture())
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func _process(delta: float) -> void:
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_camera.global_transform = real_to_exit_transform(_main_camera.global_transform)
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# TODO: Adjust near clip plane to the portal
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_camera.near = _main_camera.near
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_camera.far = _main_camera.far
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_camera.fov = _main_camera.fov
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_camera.keep_aspect = _main_camera.keep_aspect
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## Return a new Transform3D relative to the exit portal based on the real Transform3D relative to this portal.
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func real_to_exit_transform(real:Transform3D) -> Transform3D:
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# Convert from global space to local space at the entrance (this) portal
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var local:Transform3D = global_transform.affine_inverse() * real
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# Compensate for any scale the entrance portal may have
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var unscaled:Transform3D = local.scaled(global_transform.basis.get_scale())
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# Flip it (the portal always flips the view 180 degrees)
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var flipped:Transform3D = unscaled.rotated(Vector3.UP, PI)
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# Apply any scale the exit portal may have (and apply custom exit scale)
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var exit_scale_vector:Vector3 = exit_portal.global_transform.basis.get_scale()
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var scaled_at_exit:Transform3D = flipped.scaled(Vector3.ONE / exit_scale_vector * exit_scale)
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# Convert from local space at the exit portal to global space
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var local_at_exit:Transform3D = exit_portal.global_transform * scaled_at_exit
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return local_at_exit
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## Return a new position relative to the exit portal based on the real position relative to this portal.
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func real_to_exit_position(real:Vector3) -> Vector3:
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# Convert from global space to local space at the entrance (this) portal
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var local:Vector3 = global_transform.affine_inverse() * real
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# Compensate for any scale the entrance portal may have
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var unscaled:Vector3 = local * global_transform.basis.get_scale()
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# Apply any scale the exit portal may have (and apply custom exit scale)
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var exit_scale_vector:Vector3 = Vector3(-1, 1, 1) * exit_portal.global_transform.basis.get_scale()
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var scaled_at_exit:Vector3 = unscaled / exit_scale_vector * exit_scale
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# Convert from local space at the exit portal to global space
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var local_at_exit:Vector3 = exit_portal.global_transform * scaled_at_exit
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return local_at_exit
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## Return a new direction relative to the exit portal based on the real direction relative to this portal.
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func real_to_exit_direction(real:Vector3) -> Vector3:
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# Convert from global to local space at the entrance (this) portal
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var local:Vector3 = global_transform.basis.inverse() * real
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# Compensate for any scale the entrance portal may have
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var unscaled:Vector3 = local * global_transform.basis.get_scale()
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# Flip it (the portal always flips the view 180 degrees)
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var flipped:Vector3 = unscaled.rotated(Vector3.UP, PI)
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# Apply any scale the exit portal may have (and apply custom exit scale)
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var exit_scale_vector:Vector3 = exit_portal.global_transform.basis.get_scale()
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var scaled_at_exit:Vector3 = flipped / exit_scale_vector * exit_scale
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# Convert from local space at the exit portal to global space
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var local_at_exit:Vector3 = exit_portal.global_transform.basis * scaled_at_exit
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return local_at_exit
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