Unity汽车物理模拟-优快云博客

本文详细介绍如何在Unity中创建逼真的汽车物理模拟，包括导入带有轮子的游戏对象、配置刚体和碰撞体、设置物理参数以及编写控制脚本。

参考：

http://www.gotow.net/andrew/blog/?page_id=78

http://carpe.com.au/slawia/2009/08/unity-wheel-collider-part-1/

http://carpe.com.au/slawia/2009/08/unity-wheel-collider-part-2/

http://carpe.com.au/slawia/2009/08/unity-wheel-collider-part-3/

Step 1 : Importing the Game Object.

模型要有四个轮子作为子物体

Step 2 : Attaching the Physics Components

向车身添加一个rigidbody

创建一个名为"Colliders"的 empty game object，坐标为(0,0,0),在这个空物体下再创建一些包含有box collider的空物体，使这些box collider接近车身的形状。

再创建一个空物体WheelColliders，在其下在创建四个空物体，分别创建Physics/WheelCollider ，调整位置与车轮符合

Step 3 : Configuring the Physics Setup

设置三个属性：

the vehicle mass 汽车质量 (参考值1600)
the suspension spring and damping 悬挂的弹性和阻尼(参考值5500，50)
the tire friction 轮胎摩擦(参考值0.092,0.022)
Step 4 : 编写代码

var rearWheel1 : WheelCollider; var rearWheel2 : WheelCollider; var frontWheel1 : WheelCollider; var frontWheel2 : WheelCollider; var wheelFL : Transform; var wheelFR : Transform; var wheelRL : Transform; var wheelRR : Transform; var steer_max = 20; var motor_max = 10; var brake_max = 100; private var steer = 0; private var forward = 0; private var back = 0; private var motor = 0; private var brake = 0; private var reverse = false; private var speed = 0; function Start() { rigidbody.centerOfMass = Vector3(0, -0.05, 0); } function FixedUpdate () { speed = rigidbody.velocity.sqrMagnitude; steer = Mathf.Clamp(Input.GetAxis("Horizontal"), -1, 1); forward = Mathf.Clamp(Input.GetAxis("Vertical"), 0, 1); back = -1 * Mathf.Clamp(Input.GetAxis("Vertical"), -1, 0); if(speed == 0) { if(back > 0) { reverse = true; } if(forward > 0) { reverse = false; } } if(reverse) { motor = -1 * back; brake = forward; } else { motor = forward; brake = back; } rearWheel1.motorTorque = motor_max * motor; rearWheel2.motorTorque = motor_max * motor; rearWheel1.brakeTorque = brake_max * brake; rearWheel2.brakeTorque = brake_max * brake; frontWheel1.steerAngle = steer_max * steer; frontWheel2.steerAngle = steer_max * steer; wheelFL.localEulerAngles.y= steer_max * steer; wheelFR.localEulerAngles.y = steer_max * steer; wheelFR.Rotate(0, 0, frontWheel1.rpm * -6 * Time.deltaTime); wheelFL.Rotate(0, 0, frontWheel2.rpm * -6 * Time.deltaTime); wheelRR.Rotate(0, 0, rearWheel1.rpm * -6 * Time.deltaTime); wheelRL.Rotate(0, 0, rearWheel2.rpm * -6 * Time.deltaTime); }

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