3d导航软件源码

Ⅰ 求一段unity3D汽车自动驾驶的脚本代码

1、把脚本直接连到汽车车身网格上，车身要有Rigidbody Component，要有四个轮子网格做子物体。 要想有声音的话还要有AudioSource Component。

2、打开Inspector，选择汽车脚本，把四个轮子连接到相对应的Transform参数上。设置wheelRadius参数为你轮子网格的大小。WheelCollider是自动生成的，所以无需手动添加。这样就能保证运行了，其他的声音和灰尘可以再添加。

脚本源代码如下：*/
#pragma strict
//maximal corner and braking acceleration capabilities
var maxCornerAccel=10.0;
var maxBrakeAccel=10.0;
//center of gravity height - effects tilting in corners
var cogY = 0.0;
//engine powerband
var minRPM = 700;
var maxRPM = 6000;
//maximum Engine Torque
var maxTorque = 400;
//automatic transmission shift points
var shiftDownRPM = 2500;
var shiftUpRPM = 5500;
//gear ratios
var gearRatios = [-2.66, 2.66, 1.78, 1.30, 1.00];
var finalDriveRatio = 3.4;
//a basic handling modifier:
//1.0 understeer
//0.0 oversteer
var handlingTendency = 0.7;
//graphical wheel objects
var wheelFR : Transform;
var wheelFL : Transform;
var wheelBR : Transform;
var wheelBL : Transform;
//suspension setup
var suspensionDistance = 0.3;
var springs = 1000;
var dampers = 200;
var wheelRadius = 0.45;
//particle effect for ground st
var groundDustEffect : Transform;
private var queryUserInput = true;
private var engineRPM : float;
private var steerVelo = 0.0;
private var brake = 0.0;
private var handbrake = 0.0;
private var steer = 0.0;
private var motor = 0.0;
//private var skidTime = 0.0;
private var onGround = false;
private var cornerSlip = 0.0;
private var driveSlip = 0.0;
private var wheelRPM : float;
private var gear = 1;
//private var skidmarks : Skidmarks;
private var wheels : WheelData[];
private var wheelY = 0.0;
private var rev = 0.0;
//Functions to be used by external scripts
//controlling the car if required
//===================================================================
//return a status string for the vehicle
function GetStatus(gui : GUIText) {
gui.text="v="+(rigidbody.velocity.magnitude * 3.6).ToString("f1") km/h\ngear= "+gear+"\nrpm= "+engineRPM.ToString("f0");
}
//return an information string for the vehicle
function GetControlString(gui : GUIText) {
gui.text="Use arrow keys to control the jeep,\nspace for handbrake."; }
//Enable or disable user controls
function SetEnableUserInput(enableInput)
{
queryUserInput=enableInput;
}
//Car physics
//===================================================================
//some whee calculation data
class WheelData{ + "
var rotation = 0.0;
var coll : WheelCollider;
var graphic : Transform;
var maxSteerAngle = 0.0;
var lastSkidMark = -1;
var powered = false;
var handbraked = false;
var originalRotation : Quaternion;
};
function Start () {
//setup wheels
wheels=new WheelData[4];
for(i=0;i<4;i++)
wheels[i] = new WheelData();

wheels[0].graphic = wheelFL;
wheels[1].graphic = wheelFR;
wheels[2].graphic = wheelBL;
wheels[3].graphic = wheelBR;
wheels[0].maxSteerAngle=30.0;
wheels[1].maxSteerAngle=30.0;
wheels[2].powered=true;
wheels[3].powered=true;
wheels[2].handbraked=true;
wheels[3].handbraked=true;
for(w in wheels)
{
if(w.graphic==null)
Debug.Log("You need to assign all four wheels for the car script!"); if(!w.graphic.transform.IsChildOf(transform))
Debug.Log("Wheels need to be children of the Object with the car script");
w.originalRotation = w.graphic.localRotation;
//create collider
colliderObject = new GameObject("WheelCollider");
colliderObject.transform.parent = transform;
colliderObject.transform.position = w.graphic.position;
w.coll = colliderObject.AddComponent(WheelCollider);
w.coll.suspensionDistance = suspensionDistance;
w.coll.suspensionSpring.spring = springs;
w.coll.suspensionSpring.damper = dampers;
//no grip, as we simulate handling ourselves
w.coll.forwardFriction.stiffness = 0;
w.coll.sidewaysFriction.stiffness = 0;
w.coll.radius = wheelRadius;
}
//get wheel height (height forces are applied on)
wheelY=wheels[0].graphic.localPosition.y;

//setup center of gravity
rigidbody.centerOfMass.y = cogY;

//find skidmark object
// skidmarks = FindObjectOfType(typeof(Skidmarks));

//shift to first
gear=1;
}
//update wheel status
function UpdateWheels()
{
//calculate handbrake slip for traction gfx
handbrakeSlip=handbrake*rigidbody.velocity.magnitude*0.1;
if(handbrakeSlip>1)
handbrakeSlip=1;

totalSlip=0.0;
onGround=false;
for(w in wheels)
{
//rotate wheel
w.rotation += wheelRPM / 60.0 * -rev * 360.0 * Time.fixedDeltaTime; w.rotation = Mathf.Repeat(w.rotation, 360.0);
w.graphic.localRotation= Quaternion.Euler( w.rotation, w.maxSteerAngle*steer, 0.0 ) * w.originalRotation;
//check if wheel is on ground
if(w.coll.isGrounded)
onGround=true;

slip = cornerSlip+(w.powered?driveSlip:0.0)+(w.handbraked?handbrakeSlip:0.0); totalSlip += slip;

var hit : WheelHit;
var c : WheelCollider;
c = w.coll;
if(c.GetGroundHit(hit))
{
//if the wheel touches the ground, adjust graphical wheel position to reflect springs

w.graphic.localPosition.y-=Vector3.Dot(w.graphic.position-hit.point,transform.up)-w.coll.radius;

//create st on ground if appropiate
if(slip>0.5 && hit.collider.tag=="Dusty")
{
groundDustEffect.position=hit.point;

groundDustEffect.particleEmitter.worldVelocity=rigidbody.velocity*0.5; groundDustEffect.particleEmitter.minEmission=(slip-0.5)*3; groundDustEffect.particleEmitter.maxEmission=(slip-0.5)*3;
groundDustEffect.particleEmitter.Emit(); }

//and skid marks
/*if(slip>0.75 && skidmarks != null)

w.lastSkidMark=skidmarks.AddSkidMark(hit.point,hit.normal,(slip-0.75)*2,w.lastSkidMark);
else
w.lastSkidMark=-1; */
}
// else w.lastSkidMark=-1;
}
totalSlip/=wheels.length;
}
//Automatically shift gears
function AutomaticTransmission()
{
if(gear>0)
{
if(engineRPM>shiftUpRPM&&gear<gearRatios.length-1)
gear++;
if(engineRPM<shiftDownRPM&&gear>1)
gear--;
}
}
//Calculate engine acceleration force for current RPM and trottle
function CalcEngine() : float
{
if(brake+handbrake>0.；motor=0.0;；//ifcarisairborne,justre；if(!onGround)；engineRPM+=(motor-0.3)*2；engineRPM=Mathf.Clamp(en；return0.0;；else；AutomaticTransmission();；engineRPM=whee
if(brake+handbrake>0.1)

motor=0.0;

//if car is airborne, just rev engine

if(!onGround)

{

engineRPM += (motor-0.3)*25000.0*Time.deltaTime;

engineRPM = Mathf.Clamp(engineRPM,minRPM,maxRPM);

return 0.0;

}

else

{

AutomaticTransmission();

engineRPM=wheelRPM*gearRatios[gear]*finalDriveRatio;

if(engineRPM<minRPM)

engineRPM=minRPM;

if(engineRPM<maxRPM)

{

//fake a basic torque curve

x = (2*(engineRPM/maxRPM)-1);

torqueCurve = 0.5*(-x*x+2);

torqueToForceRatio = gearRatios[gear]*finalDriveRatio/wheelRadius; return
motor*maxTorque*torqueCurve*torqueToForceRatio;

}

else

//rpm delimiter

return 0.0;

}

}

//Car physics

//The physics of this car are really a trial-and-error based extension of
//basic "Asteriods" physics -- so you will get a pretty arcade-like feel. //This
may or may not be what you want, for a more physical approach research //the
wheel colliders

function HandlePhysics () {

var velo=rigidbody.velocity;

wheelRPM=velo.magnitude*60.0*0.5;

rigidbody.angularVelocity=new

Vector3(rigidbody.angularVelocity.x,0.0,rigidbody.angularVelocity.z);
dir=transform.TransformDirection(Vector3.forward);

flatDir=Vector3.Normalize(new Vector3(dir.x,0,dir.z));

flatVelo=new Vector3(velo.x,0,velo.z);

rev=Mathf.Sign(Vector3.Dot(flatVelo,flatDir));

//when moving backwards or standing and brake is pressed, switch to
reverse

if((rev<0||flatVelo.sqrMagnitude<0.5)&&brake>0.1)

gear=0;

if(gear==0)

{

//when in reverse, flip brake and gas

tmp=brake;

brake=motor;

motor=tmp;

//when moving forward or standing and gas is pressed, switch to drive
if((rev>0||flatVelo.sqrMagnitude<0.5)&&brake>0.1)

gear=1;

}

engineForce=flatDir*CalcEngine();

totalbrake=brake+handbrake*0.5;

if(totalbrake>1.0)totalbrake=1.0;

brakeForce=-flatVelo.normalized*totalbrake*rigidbody.mass*maxBrakeAccel;
flatDir*=flatVelo.magnitude;

flatDir=Quaternion.AngleAxis(steer*30.0,Vector3.up)*flatDir;

flatDir*=rev;

diff=(flatVelo-flatDir).magnitude;

cornerAccel=maxCornerAccel;

if(cornerAccel>diff)cornerAccel=diff;

cornerForce=-(flatVelo-flatDir).normalized*cornerAccel*rigidbody.mass;
cornerSlip=Mathf.Pow(cornerAccel/maxCornerAccel,3);

rigidbody.AddForceAtPosition(brakeForce+engineForce+cornerForce,transform.position+transform.up*wheelY);

handbrakeFactor=1+handbrake*4;

if(rev<0)

handbrakeFactor=1;

veloSteer=((15/(2*velo.magnitude+1))+1)*handbrakeFactor;

steerGrip=(1-handlingTendency*cornerSlip);

if(rev*steer*steerVelo<0)

steerGrip=1;

maxRotSteer=2*Time.fixedDeltaTime*handbrakeFactor*steerGrip;

fVelo=velo.magnitude;

veloFactor=fVelo<1.0?fVelo:Mathf.Pow(velo.magnitude,0.3);

steerVeloInput=rev*steer*veloFactor*0.5*Time.fixedDeltaTime*handbrakeFactor;
if(velo.magnitude<0.1)

steerVeloInput=0;

if(steerVeloInput>steerVelo)

{

steerVelo+=0.02*Time.fixedDeltaTime*veloSteer;

if(steerVeloInput<steerVelo)

steerVelo=steerVeloInput;

}

else

{

steerVelo-=0.02*Time.fixedDeltaTime*veloSteer;

if(steerVeloInput>steerVelo)

steerVelo=steerVeloInput;

}

steerVelo=Mathf.Clamp(steerVelo,-maxRotSteer,maxRotSteer);
transform.Rotate(Vector3.up*steerVelo*57.295788);

}

function FixedUpdate () {

//query input axes if necessarry

if(queryUserInput)

{

brake = Mathf.Clamp01(-Input.GetAxis("Vertical"));

handbrake = Input.GetButton("Jump")?1.0:0.0;

steer = Input.GetAxis("Horizontal");

motor = Mathf.Clamp01(Input.GetAxis("Vertical"));

}

else

{

motor = 0;

steer = 0;

brake = 0;

handbrake = 0;

}

//if car is on ground calculate handling, otherwise just rev the engine
if(onGround)

HandlePhysics();

else

CalcEngine();

//wheel GFX

UpdateWheels();

//engine sounds

audio.pitch=0.5+0.2*motor+0.8*engineRPM/maxRPM;

audio.volume=0.5+0.8*motor+0.2*engineRPM/maxRPM;

}

//Called by DamageReceiver if boat destroyed

function Detonate()

{

//destroy wheels

for( w in wheels )

w.coll.gameObject.active=false; //no more car physics

enabled=false;

}

Ⅱ Unity3D这款游戏引擎软件的源码是开源的吗

Unity3D是不开源的。

相关介绍：

Unity类似于Director、Blender game engine、Virtools 或 Torque Game Builder等利用交互的图型化开发环境为首要方式的软件。

开放源码软件通常是有right的，它的许可证可能包含这样一些限制： 蓄意的保护它的开放源码状态，着者身份的公告，或者开发的控制。“开放源码”正在被公众利益软件组织注册为认证标记，这也是创立正式的开放源码定义的一种手段。

(2)3d导航软件源码扩展阅读

开放源码软件主要被散布在全世界的编程者队伍所开发，但是同时一些大学，政府机构承包商，协会和商业公司也开发它。源代码开放是信息技术发展引发网络革命所带来的面向未来以开放创新、共同创新为特点的、以人为本的创新2.0模式在软件行业的典型体现和生动注解。

共享软件。允许他人自由拷贝并收取合理注册费用。使用者可在软件规定的试用期限内免费试用，再决定注册购买与否。大部分共享版软件都有功能和时间限制，试用期通常分为7天、21天、30天不等。而有的共享软件还限制用户只能安装一次，若删除后重新安装将会失效。像Winzip、ACDSee等软件就是共享软件。

Ⅲ Cesium专栏-裁剪效果（基于3dtiles模型，附源码下载）

Cesium是一款全球领先的JavaScript开源产品，专为构建高质量三维地球与地图的Web应用而设计。借助Cesium提供的JavaScript开发包，开发者能轻松创建无需插件的虚拟地球应用，且确保在性能、精度、渲染质量以及多平台兼容性与易用性方面达到高标准。

探讨裁剪功能，这一概念在图像处理领域并不陌生。在三维场景中，Cesium能够实现类似PS中的裁剪效果，即动态调整视图区域，突出展示用户感兴趣的三维模型部分。本文重点介绍如何基于3dtiles模型实现这一功能。

实现动态裁剪模型效果，需要遵循以下步骤：

1. 初始化地球模型，并启用深度测试功能，确保场景中的元素正确排序，提升视觉效果。

2. 创建一个切面平面对象，用以定义裁剪区域的边界。

3. 加载3dtiles模型，并将裁剪平面应用到模型上，实现动态调整视图区域的功能。

对于想要实践这一效果的开发者，我们提供了源码下载。只需点击下方链接，即可获取实现动态裁剪模型功能所需的Cesium源码。