3d導航軟體源碼

Ⅰ 求一段unity3D汽車自動駕駛的腳本代碼

1、把腳本直接連到汽車車身網格上，車身要有Rigidbody Component，要有四個輪子網格做子物體。 要想有聲音的話還要有AudioSource Component。

2、打開Inspector，選擇汽車腳本，把四個輪子連接到相對應的Transform參數上。設置wheelRadius參數為你輪子網格的大小。WheelCollider是自動生成的，所以無需手動添加。這樣就能保證運行了，其他的聲音和灰塵可以再添加。

腳本源代碼如下：*/
#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這款游戲引擎軟體的源碼是開源的嗎

Unity3D是不開源的。

相關介紹：

Unity類似於Director、Blender game engine、Virtools 或 Torque Game Builder等利用交互的圖型化開發環境為首要方式的軟體。

開放源碼軟體通常是有right的，它的許可證可能包含這樣一些限制： 蓄意的保護它的開放源碼狀態，著者身份的公告，或者開發的控制。「開放源碼」正在被公眾利益軟體組織注冊為認證標記，這也是創立正式的開放源碼定義的一種手段。

(2)3d導航軟體源碼擴展閱讀

開放源碼軟體主要被散布在全世界的編程者隊伍所開發，但是同時一些大學，政府機構承包商，協會和商業公司也開發它。源代碼開放是信息技術發展引發網路革命所帶來的面向未來以開放創新、共同創新為特點的、以人為本的創新2.0模式在軟體行業的典型體現和生動註解。

共享軟體。允許他人自由拷貝並收取合理注冊費用。使用者可在軟體規定的試用期限內免費試用，再決定注冊購買與否。大部分共享版軟體都有功能和時間限制，試用期通常分為7天、21天、30天不等。而有的共享軟體還限制用戶只能安裝一次，若刪除後重新安裝將會失效。像Winzip、ACDSee等軟體就是共享軟體。

Ⅲ Cesium專欄-裁剪效果（基於3dtiles模型，附源碼下載）

Cesium是一款全球領先的JavaScript開源產品，專為構建高質量三維地球與地圖的Web應用而設計。藉助Cesium提供的JavaScript開發包，開發者能輕松創建無需插件的虛擬地球應用，且確保在性能、精度、渲染質量以及多平台兼容性與易用性方面達到高標准。

探討裁剪功能，這一概念在圖像處理領域並不陌生。在三維場景中，Cesium能夠實現類似PS中的裁剪效果，即動態調整視圖區域，突出展示用戶感興趣的三維模型部分。本文重點介紹如何基於3dtiles模型實現這一功能。

實現動態裁剪模型效果，需要遵循以下步驟：

1. 初始化地球模型，並啟用深度測試功能，確保場景中的元素正確排序，提升視覺效果。

2. 創建一個切面平面對象，用以定義裁剪區域的邊界。

3. 載入3dtiles模型，並將裁剪平面應用到模型上，實現動態調整視圖區域的功能。

對於想要實踐這一效果的開發者，我們提供了源碼下載。只需點擊下方鏈接，即可獲取實現動態裁剪模型功能所需的Cesium源碼。