57 lines
1.9 KiB
GDScript
57 lines
1.9 KiB
GDScript
extends CharacterBody3D
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## 角色的质量，单位 kg
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const weight := 60
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## 角色前进的动力,同样先简化处理，单位 N
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const power := 800
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## 一个最简单的阻尼系数[br]
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## 阻力计算公式 速度² × 阻尼系数[br]
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## 假设最高速度是慢跑 10km/h , 2.77m/s，那么阻力需要在这个速度下维持和动力平衡。也就是...104.3
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const damping := 104.3
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## 最后一次计算之后的，当前运动状态的向量
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var last_vector = Vector3.ZERO
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var fall_acceleration = 75
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var target_velocity = Vector3.ZERO
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func _physics_process(delta: float) -> void:
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# 指令方向
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var cmd_vector_direction := get_cmd_vector()
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# 运动方向
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var pre_vector_direction = last_vector.normalized()
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# 计算当前运动状态，方向在上一步已经更新过了。剩下的是模量问题。
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# 指令力
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var cmd_vector_power = cmd_vector_direction * power
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# 阻力
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var damping_vector = -pre_vector.normalized() * last_vector.length_squared() * damping
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# 若指令方向和运动方向不同，则必然会产生
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if cmd_vector_direction != pre_vector_direction:
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pre_vector_direction = (pre_vector_direction + cmd_vector_direction).normalized()
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$pivot.basis = Basis.looking_at(pre_vector_direction)
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# 速度计算部分
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#target_velocity.x = direction.x * now_speed
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#target_velocity.z = direction.z * now_speed
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if !is_on_floor():
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target_velocity.y = target_velocity.y - ( fall_acceleration * delta )
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velocity = target_velocity
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move_and_slide()
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## 获取当前指令的关联向量[br]
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## 难道需要两层才生效？
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func get_cmd_vector() -> Vector3:
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var vector := Vector3.ZERO
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if Input.is_action_pressed("move_forward"):
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vector.z -= 1
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if Input.is_action_pressed("move_back"):
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vector.z += 1
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if Input.is_action_pressed("move_left"):
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vector.x -= 1
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if Input.is_action_pressed("move_right"):
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vector.x += 1
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return vector.normalized()
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