unity3d的动力学汽车脚本

1、/*unity3d的动力学汽车脚本收藏这是从官网论坛上收集的一个汽车脚本，经过验证可以使用。由于skidmarks这个配套的脚本没有找到，所以把 skidmarks相关的语句都屏蔽了，所以很遗憾没有刹车印的效果，其他的没有改。使用方法如下： 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

2、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

3、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; /grap

4、hical 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 dust var grounddusteffect : transform; pr

5、ivate 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 dr

6、iveslip = 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 vehicl

7、e function getstatus(gui : guitext) gui.text=v=+(rigidbody.velocity.magnitude * 3.6).tostring(f1) + km/hngear= +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.

8、; /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 = fal

9、se; var handbraked = false; var originalrotation : quaternion; ; function start () /setup wheels wheels=new wheeldata4; for(i=0;i1) 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.re

10、peat(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 hi

11、t : 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 dust on ground if appropiate if(slip0.

12、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(); /

13、and skid marks /*if(slip0.75 & 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(gear0) if(engin

14、erpmshiftuprpm&geargearratios.length-1) gear+; if(enginerpm1) gear-; /calculate engine acceleration force for current rpm and trottle function calcengine() : float /no engine when braking if(brake+handbrake0.1) motor=0.0; /if car is airborne, just rev engine if(!onground) enginerpm += (motor-0.3

15、)*25000.0*time.deltatime; enginerpm = mathf.clamp(enginerpm,minrpm,maxrpm); return 0.0; else automatictransmission(); enginerpm=wheelrpm*gearratiosgear*finaldriveratio; if(enginerpmminrpm) enginerpm=minrpm; if(enginerpmmaxrpm) /fake a basic torque curve x = (2*(enginerpm/maxrpm)-1); torquecurve = 0.

16、5*(-x*x+2); torquetoforceratio = gearratiosgear*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 prett

17、y 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.angularveloci

18、ty.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(rev0|flatvelo.sqrmagnitud

19、e0.1) 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(rev0|flatvelo.sqrmagnitude0.1) gear=1; engineforce=flatdir*calcengine(); totalbrake=brake+handbrake*0.5; if(totalbrake1.0)totalbrak

20、e=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(corneracceldiff)corneraccel=diff; cornerforce=-(fl

21、atvelo-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(rev0) handbrakefactor=1; velosteer=(15/(2*velo.magnitu

22、de+1)+1)*handbrakefactor; steergrip=(1-handlingtendency*cornerslip); if(rev*steer*steervelo0) steergrip=1; maxrotsteer=2*time.fixeddeltatime*handbrakefactor*steergrip; fvelo=velo.magnitude; velofactor=fvelo1.0?fvelo:mathf.pow(velo.magnitude,0.3); steerveloinput=rev*steer*velofactor*0.5*time.fixeddeltatime*handbrakefactor; if(velo.magnitudesteervelo) steervelo+=0.02*time.fixeddeltatime*velosteer; if(steerveloinputsteervelo) steervelo=steerveloinput; steervelo=mathf.clamp(steervelo,-maxrotsteer,maxrotsteer); transform.rotate(vector3.up*steervelo*57.295788); function fixedupdate () /query inp