karl
219c8731f5
Works fairly well, although it doesn't account for changing acceleration which happens due to the changing gravity. I guess this is good enough, since it does hit if the player isn't careful
113 lines
3.3 KiB
GDScript
113 lines
3.3 KiB
GDScript
extends KinematicBody
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const MAX_VEL = 500.0
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var acceleration := Vector3(0.0, -9.81, 0.0)
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var velocity := Vector3(0.0, 0.0, 0.0)
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var move_accel = 60.0
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var rotate_speed = 2.0
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var drag = 0.05
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# Jumping
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var jumping := false
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var on_ground := false
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var time_since_jump_start := 0.0
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var initial_jump_burst = 10.0
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var jump_exponent = 0.05
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var current_target_velocity := Vector3.ZERO
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export(NodePath) var solar_system
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func _input(event):
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if event.is_action_pressed("jump") and on_ground:
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on_ground = false
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jumping = true
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time_since_jump_start = 0.0
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elif event.is_action_released("jump"):
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jumping = false
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func get_center():
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return global_transform.origin + global_transform.basis.y
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func apply_acceleration(acceleration):
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# First drag, then add the new acceleration
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# For drag: Lerp towards the target velocity
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# This is usually 0, unless we're on something that's moving, in which case it is that object's
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# velocity
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velocity = lerp(velocity, current_target_velocity, drag)
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velocity += acceleration
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# Called every frame. 'delta' is the elapsed time since the previous frame.
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func _physics_process(delta):
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var move_velocity := Vector3.ZERO
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var move_acceleration := Vector3.ZERO
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# Movement and rotation
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if Input.is_action_pressed("move_up"):
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move_acceleration.z -= move_accel
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if Input.is_action_pressed("move_down"):
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move_acceleration.z += move_accel
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if Input.is_action_pressed("move_left"):
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rotate(transform.basis.y, delta * rotate_speed)
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if Input.is_action_pressed("move_right"):
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rotate(transform.basis.y, -delta * rotate_speed)
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# Make movement local
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move_acceleration = transform.basis * move_acceleration
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# Jumping and Gravity
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var gravity_acceleration = get_node(solar_system).get_gravitation_acceleration(transform.origin)
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apply_acceleration((move_acceleration + gravity_acceleration) * delta)
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# Handle jumping
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if jumping:
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# Continuously apply an impulse by adding velocity: a lot at first, then less until it's 0
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# Use max() to avoid NaN from being applied once no more impulse should be added
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var e_section = max(
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exp(log(initial_jump_burst - 1 / jump_exponent * time_since_jump_start)),
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0.0
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)
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velocity += -gravity_acceleration.normalized() * e_section
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time_since_jump_start += delta
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# Apply movement to position
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# FIXME: move_and_slide might make more sense, but couldn't quite get that to work...
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#move_and_slide(velocity, -gravity_acceleration.normalized(), true)
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var collision = move_and_collide(velocity * delta)
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if collision:
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if collision.collider.is_in_group("MovingPlatform"):
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# Inherit the moving platform's velocity
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current_target_velocity = collision.collider.velocity
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velocity = current_target_velocity
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if not jumping:
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on_ground = true
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else:
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# We're not colliding with anything, so drag takes us towards 0
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current_target_velocity = Vector3.ZERO
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# Clamp the velocity just to be save
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velocity.x = clamp(velocity.x, -MAX_VEL, MAX_VEL)
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velocity.y = clamp(velocity.y, -MAX_VEL, MAX_VEL)
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velocity.z = clamp(velocity.z, -MAX_VEL, MAX_VEL)
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# Rotate down vector to face center of gravity
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var down = gravity_acceleration
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var local_down = transform.basis * Vector3.DOWN
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var angle = local_down.angle_to(down)
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var axis = local_down.cross(down).normalized()
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# An axis of 0 happens if we're perfectly aligned already (local_down and down are equal)
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if axis != Vector3.ZERO:
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rotate(axis, angle)
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