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初步物理计算

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des
2026-01-06 00:18:13 +08:00
parent 89e0b55794
commit e349a9fc27
2 changed files with 48 additions and 20 deletions
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59
palyer.gd
View File

@@ -1,29 +1,56 @@
extends CharacterBody3D
var speed = 14
## 角色的质量，单位 kg
const weight := 60
## 角色前进的动力,同样先简化处理，单位 N
const power := 800
## 一个最简单的阻尼系数[br]
## 阻力计算公式 速度² × 阻尼系数[br]
## 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
const damping := 104.3
## 最后一次计算之后的，当前运动状态的向量
var last_vector = Vector3.ZERO
var fall_acceleration = 75
var target_velocity = Vector3.ZERO
func _physics_process(delta: float):
var direction = Vector3.ZERO
if Input.is_action_pressed("move_forward"):
direction.z -= 1
if Input.is_action_pressed("move_back"):
direction.z += 1
if Input.is_action_pressed("move_left"):
direction.x -= 1
if Input.is_action_pressed("move_right"):
direction.x += 1
if direction != Vector3.ZERO:
direction = direction.normalized()
$pivot.basis = Basis.looking_at(direction)
target_velocity.x = direction.x * speed
target_velocity.z = direction.z * speed
func _physics_process(delta: float) -> void:
# 指令方向
var cmd_vector_direction := get_cmd_vector()
# 运动方向
var pre_vector_direction = last_vector.normalized()
# 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。
# 指令力
var cmd_vector_power = cmd_vector_direction * power
# 阻力
var damping_vector = -pre_vector.normalized() * last_vector.length_squared() * damping
# 若指令方向和运动方向不同，则必然会产生
if cmd_vector_direction != pre_vector_direction:
pre_vector_direction = (pre_vector_direction + cmd_vector_direction).normalized()
$pivot.basis = Basis.looking_at(pre_vector_direction)
# 速度计算部分
#target_velocity.x = direction.x * now_speed
#target_velocity.z = direction.z * now_speed
if !is_on_floor():
target_velocity.y = target_velocity.y - ( fall_acceleration * delta )
velocity = target_velocity
move_and_slide()
## 获取当前指令的关联向量[br]
## 难道需要两层才生效？
func get_cmd_vector() -> Vector3:
var vector := Vector3.ZERO
if Input.is_action_pressed("move_forward"):
vector.z -= 1
if Input.is_action_pressed("move_back"):
vector.z += 1
if Input.is_action_pressed("move_left"):
vector.x -= 1
if Input.is_action_pressed("move_right"):
vector.x += 1
return vector.normalized()

9
palyer.tscn
View File

@@ -3,8 +3,9 @@
[ext_resource type="PackedScene" uid="uid://dolueyckipny0" path="res://art/player.glb" id="1_ed8k8"]
[ext_resource type="Script" uid="uid://di50p6h46nmlw" path="res://palyer.gd" id="1_vgmp0"]
[sub_resource type="BoxShape3D" id="BoxShape3D_vgmp0"]
size = Vector3(1.954834, 3.081192, 1.1972656)
[sub_resource type="CylinderShape3D" id="CylinderShape3D_vgmp0"]
height = 1.2167969
radius = 1.0029297
[node name="palyer" type="CharacterBody3D"]
script = ExtResource("1_vgmp0")
@@ -14,5 +15,5 @@ script = ExtResource("1_vgmp0")
[node name="player" parent="pivot" instance=ExtResource("1_ed8k8")]
[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
transform = Transform3D(1, 0, 0, 0, 0.0023910538, 0.99999714, 0, -0.99999714, 0.0023910538, 0.0345459, 0.12650633, 0.40051335)
shape = SubResource("BoxShape3D_vgmp0")
transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.018975854, 0.14160156, 0)
shape = SubResource("CylinderShape3D_vgmp0")