NFS达人请进！关于轮胎！！

tanjie249

有一个疑问估计一直疑惑着所有人，极品10和9等中轮胎那一项到底是怎么设定的？
众所周知，在现实中，不同牌子的轮胎的性能参差不齐，统一的来说，宽胎抓地力强，容易操纵，窄胎速度快，不过起步过弯难以操控。厚胎加速稳定，下压力强，薄胎转弯侧倾小，过弯稳定，不过易颠簸。
那么极品中的轮胎到底是怎么回事呢？直接影响车子性能？或是仅仅起到装饰的作用？如果仅仅起到装饰作用，那为什么要弄出那么多的品牌呢？为什么每个品牌还要让你选择轮胎的薄厚度，弄出17”18”19”20”21”这么多的号呢？   而如果是起到改变车子性能的作用，那会改变什么？在下曾经测试过，同样的车，同样的赛道，同样的人操控，用不同的两组轮胎来跑，结果却是，得出的数据是差不多的。从数据上来看，轮胎对车子的性能好像起不到什么太大的改变作用。
NFS中的轮胎对于车子到底是一个什么样的存在？不知道有没有哪位高人，有什么具体的见地？

orochi99999

就说说我的感受吧。主要是10
我10玩得很多，9很少。
性能调校里面的“漂移”“中等”“抓地力”这些是有明显区别的。本人喜欢用漂移，主要是体现在过弯的时候用漂移会很流畅。但是平常开的时候抓地力方面和其他两项感觉其实差不多，没什么区别。主要体现在过弯上流畅。
轮子品牌方面貌似没什么区别的，装饰而已。轮子大小有点影响过弯的。大，速度快，但是大的话小弯可能难过点。

[ 本帖最后由 orochi99999 于 2009-10-28 15:59 编辑 ]

jaynfs

17”18”19”20”21”这些不是厚度，是轮圈大小......................

kloss

我说下NFS13的吧，前代的没研究过。NFS 13是GM2的物理引擎为基础的，所以用的是Pacejka-like的轮胎物理模型，下面是NFS 13的某个轮胎物理的参数，完全可以套用在RF GTR2等游戏上面，当然和RF GTR2的物理内容上还是有点点区别，有兴趣的话可以找GM引擎的物理工具查看NFS 13轮胎物理的曲线，还有NFS 13的轮胎物理文件里没有Width胎宽这行参数和Radius轮胎半径 ，不知道这两行参数飞哪个地方去了。只是在开头随便写了个225/45-18 的轮胎规格， 像DryLatLong这行就是抓地力范围的参数，WearRate就是轮胎损耗速度的一个值【当然NFS 13屏蔽掉了】，Heating就是控制轮胎的温度变化速度参数。具体自己看右边的英文说明吧。



//Tire file Street Hi=Performance - Rear wheel drive cars
//Cars:
// 225/45-18 front
// 225/45-18 rear
// Tire brand found in *.hdc files refer to file name.
//
[SLIPCURVE]
Name="Lat"
Step=0.009000            // Slip step
DropoffFunction=0.50      // see above            
Data:
0.000 0.0042 0.0084 0.0126 0.0168 0.021 0.0252 0.0294 0.0336 0.0378
0.042 0.0462 0.0504 0.0546 0.0588 0.063 0.0672 0.0714 0.0756 0.0798
0.084 0.0882 0.0924 0.0966 0.1008 0.105 0.1092 0.1134 0.1176 0.1218
0.126 0.1302 0.1344 0.1386 0.1428 0.147 0.1512 0.1554 0.1596 0.1638
0.168 0.1722 0.1764 0.1806 0.1848 0.189 0.1932 0.1974 0.2016 0.2058
0.210 0.2142 0.2184 0.2226 0.2268 0.231 0.2352 0.2394 0.2436 0.2478
0.252 0.2562 0.2604 0.2646 0.2688 0.273 0.2772 0.2814 0.2856 0.2898
0.294 0.2982 0.3024 0.3066 0.3108 0.315 0.3192 0.3234 0.3276 0.3318
0.336 0.3402 0.3444 0.3486 0.3528 0.357 0.3612 0.3654 0.3696 0.3738
0.378 0.3822 0.3864 0.3906 0.3948 0.399 0.4032 0.4074 0.4116 0.4158
0.420 0.4242 0.4284 0.4326 0.4368 0.441 0.4452 0.4494 0.4536 0.4578
0.462 0.4662 0.4704 0.4746 0.4788 0.483 0.4872 0.4914 0.4956 0.4998
0.504 0.5082 0.5124 0.5166 0.5208 0.525 0.5292 0.5334 0.5376 0.5418
0.546 0.5502 0.5544 0.5586 0.5628 0.567 0.5712 0.5754 0.5796 0.5838
0.588 0.5922 0.5964 0.6006 0.6048 0.609 0.6132 0.6174 0.6216 0.6258
0.630 0.6342 0.6384 0.6426 0.6468 0.651 0.6552 0.6594 0.6636 0.6678
0.672 0.6762 0.6804 0.6846 0.6888 0.693 0.6972 0.7014 0.7056 0.7098
0.714 0.7182 0.7224 0.7266 0.7308 0.735 0.7392 0.7434 0.7476 0.7518
0.756 0.7602 0.7644 0.7686 0.7728 0.777 0.7812 0.7854 0.7896 0.7938
0.798 0.8022 0.8064 0.8106 0.8148 0.819 0.8232 0.8274 0.8316 0.8358
0.840 0.8442 0.8484 0.8526 0.8568 0.861 0.8652 0.8694 0.8736 0.8778
0.882 0.8862 0.8904 0.8946 0.8988 0.903 0.9072 0.9114 0.9156 0.9198
0.924 0.9282 0.9324 0.9366 0.9408 0.945 0.9492 0.9534 0.9576 0.9618
0.966 0.9682 0.9714 0.9756 0.9790 0.982 0.9825

[SLIPCURVE]
Name="Long"
Step=0.009000            // Slip step
DropoffFunction=0.50      // see above            
Data:
0.000 0.0042 0.0084 0.0126 0.0168 0.021 0.0252 0.0294 0.0336 0.0378
0.042 0.0462 0.0504 0.0546 0.0588 0.063 0.0672 0.0714 0.0756 0.0798
0.084 0.0882 0.0924 0.0966 0.1008 0.105 0.1092 0.1134 0.1176 0.1218
0.126 0.1302 0.1344 0.1386 0.1428 0.147 0.1512 0.1554 0.1596 0.1638
0.168 0.1722 0.1764 0.1806 0.1848 0.189 0.1932 0.1974 0.2016 0.2058
0.210 0.2142 0.2184 0.2226 0.2268 0.231 0.2352 0.2394 0.2436 0.2478
0.252 0.2562 0.2604 0.2646 0.2688 0.273 0.2772 0.2814 0.2856 0.2898
0.294 0.2982 0.3024 0.3066 0.3108 0.315 0.3192 0.3234 0.3276 0.3318
0.336 0.3402 0.3444 0.3486 0.3528 0.357 0.3612 0.3654 0.3696 0.3738
0.378 0.3822 0.3864 0.3906 0.3948 0.399 0.4032 0.4074 0.4116 0.4158
0.420 0.4242 0.4284 0.4326 0.4368 0.441 0.4452 0.4494 0.4536 0.4578
0.462 0.4662 0.4704 0.4746 0.4788 0.483 0.4872 0.4914 0.4956 0.4998
0.504 0.5082 0.5124 0.5166 0.5208 0.525 0.5292 0.5334 0.5376 0.5418
0.546 0.5502 0.5544 0.5586 0.5628 0.567 0.5712 0.5754 0.5796 0.5838
0.588 0.5922 0.5964 0.6006 0.6048 0.609 0.6132 0.6174 0.6216 0.6258
0.630 0.6342 0.6384 0.6426 0.6468 0.651 0.6552 0.6594 0.6636 0.6678
0.672 0.6762 0.6804 0.6846 0.6888 0.693 0.6972 0.7014 0.7056 0.7098
0.714 0.7182 0.7224 0.7266 0.7308 0.735 0.7392 0.7434 0.7476 0.7518
0.756 0.7602 0.7644 0.7686 0.7728 0.777 0.7812 0.7854 0.7896 0.7938
0.798 0.8022 0.8064 0.8106 0.8148 0.819 0.8232 0.8274 0.8316 0.8358
0.840 0.8442 0.8484 0.8526 0.8568 0.861 0.8652 0.8694 0.8736 0.8778
0.882 0.8862 0.8904 0.8946 0.8988 0.903 0.9072 0.9114 0.9156 0.9198
0.924 0.9282 0.9324 0.9366 0.9408 0.945 0.9492 0.9534 0.9576 0.9618
0.966 0.9682 0.9714 0.9756 0.9790 0.982 0.9825

[COMPOUND]
LaunchControlFactor=0.80 // Lessens launch grip reduction effect.  Range 0.0-1.0 (1.0 is no change, 0.0 disable the effect).
Name="Hi-Performance Street"
Style=0 //0 = treaded, 1 = slick, 2 = wet
FRONT:                                // Arguments:ALL,FRONT,REAR,LEFT,RIGHT,FRONTLEFT, FRONTRIGHT,REARLEFT,REARRIGHT
DryLatLong=(1.580, 1.580)             // Lateral/longitudinal coefficients in dry weather
WetLatLong=(1.570, 1.570)             // Lateral/longitudinal coefficients in wet weather
DrySlide=1.50                            // sliding coefficient in dry weather
WetSlide=1.40                            //sliding coefficient in wet weather
CorneringStiffness=33000.0            //Base Cornering stiffness (N/rad)
BrakingStiffness=33000.0            //Base Braking stiffness (N)
SelfAligningStiffness=3300.0            //Self aligning stiffness (Nm/rad)
CamberStiffnessRelative=0.1    // Example: 0.1 setting gives for 1 deg camber nets 0.1 deg toe in
//RadiusRPM=0.00                     // Increased radius per unit RPM
SpringBase=50500.0                   // Base spring rate with no pressure ( 1050lb/in @ 170kpsi)
SpringkPa=550.00                      // Spring rate per unit pressure
Damper=525.0                         // Damping rate of tire
SpeedEffects=(1000.5,15.0)            // Speed at which grip drops to half (m/s, 0.0 to disable), speed load equivalency (see above)
LoadSens=(-3.10e-6, 0.40, 13000.0)    // Load sensitivity of tire (initial slope, final grip multiplier, final load)
LatPeak=(0.20, 0.20, 9500.0)       // Slip range where lateral peak force occurs depending on load
LongPeak=(0.20, 0.20, 9500.0)      // Slip range where longitudinal peak force occurs depending on load
HeatBasePeak=(0.17,0.5)    // static peak slip to compute friction heat, fraction of static peak slip to use (the remainder will be the dynamic peakslip)
LatCurve="Lat"                    // Slip angle curve (data uses normalized angle)
BrakingCurve="Long"                // Slip ratio curve under braking
TractiveCurve="Long"               // Slip ratio curve under acceleration
CamberLatLong=(0.50, 0.05, 0.0)      // Peak camber angle, lateral gain at peak, longitudinal loss at 90 degrees
RollingResistance=1800.0              // Resistance torque (Nm) per unit deflection (m) on ground
Heating=(5.50e-1, 5.50e-3)            // Heat caused by (rolling, friction)
Transfer=(12.00e-3, 2.00e-3, 2.00e-4) // Heat transfer to (road, static air, moving air)
HeatDistrib=(12.00,200.0)              // (Max camber angle, max off-pressure) that affects heat distribution (higher number -> less temperature difference)
AirTreadRate=0.020                    // Heat transfer between tread and inside air
WearRate=0.152e-6                     // Wear rate constant
Softness=0.55                          // Softness is now just for AI strategic use
AISens=(0.80,25650.0)                 // Simplified AI load sensitivity (final grip mult, final load)
AIGripMult=1.20                      // Grip multiplier for AI vehicles (due to tire model simplification)
AIPeakSlip=0.115                      // Simple peak slip angle for AI vehicles
AIWear=0.413e-7                       // AI wear rate constant
Temperatures=(85.0,20.0)                     // Optimum operating temperature for peak forces, cold starting temp (Celsius)
OptimumPressureBase=100.0              // Base pressure to remain flat on ground at zero deflection
OptimumPressureMult=0.0250          // Multiplier by load to stay flat on ground
GripTempPress=(0.55, 0.55, 0.40)        // Grip effects of being below temp,above temp, and off-pressure (higher number -> faster grip dropoff)
//UPGRADES - FRONT
FrontDryLat=(1.0,1.12,0,4) // 5% front grip increase over 9 upgrades
FrontDryLong=(1.0,1.12,0,4)
FrontWetLat=(1.0,1.12,0,4)
FrontWetLong=(1.0,1.12,0,4)
FrontDrySlide=(1.0,1.12,0,4)
FrontWetSlide=(1.0,1.12,0,4)
//FrontCorneringStiffness=(1.0,0.95,0,4) //10% cornering/braking stiffness increase over 9 upgrades
//FrontBrakingStiffness=(1.0,0.95,0,4)
//FrontSelfAligningStiffness=(1.0,0.95,0,4)
//
REAR:
DryLatLong=(1.580, 1.580)             // Lateral/longitudinal coefficients in dry weather
WetLatLong=(1.570, 1.570)             // Lateral/longitudinal coefficients in wet weather
DrySlide=1.50                            // sliding coefficient in dry weather
WetSlide=1.40                            //sliding coefficient in wet weather
CorneringStiffness=36000.0            //Base Cornering stiffness (N/rad)
BrakingStiffness=36000.0            //Base Braking stiffness (N)
SelfAligningStiffness=3600.0            //Self aligning stiffness (Nm/rad)
CamberStiffnessRelative=0.1    // Example: 0.1 setting gives for 1 deg camber nets 0.1 deg toe in
//RadiusRPM=0.00                     // Increased radius per unit RPM
SpringBase=50500.0                  
SpringkPa=550.00
Damper=525.0
SpeedEffects=(1000.5,15.0)            // Speed at which grip drops to half (m/s, 0.0 to disable), speed load equivalency (see above)
LoadSens=(-3.10e-6, 0.40, 13000.0)    // Load sensitivity of tire (initial slope, final grip multiplier, final load)
//LongTorqueSens=(0.0, 0.85, 2500.0)
LatPeak=(0.20, 0.20, 9500.0)
LongPeak=(0.20, 0.20, 9500.0)
HeatBasePeak=(0.17,0.5)
LatCurve="Lat"
BrakingCurve="Long"
TractiveCurve="Long"
CamberLatLong=(0.50, 0.05, 0.0)
RollingResistance=1800.0
Heating=(4.50e-1, 4.50e-3)           
Transfer=(15.00e-3, 2.00e-3, 1.00e-4)
HeatDistrib=(14.00,200.0)
AirTreadRate=0.020
WearRate=0.160e-6
Softness=0.55
AISens=(0.80,25650.0)
AIGripMult=1.30
AIPeakSlip=0.115
AIWear=0.405e-7
Temperatures=(85.0,20.0)
OptimumPressureBase=100.0
OptimumPressureMult=0.0240
GripTempPress=(0.55, 0.55, 0.40)
//UPGRADES - REAR
RearDryLat=(1.0,1.14,0,4) // 8% rear grip increase over 9 upgrades
RearDryLong=(1.0,1.14,0,4)
RearWetLat=(1.0,1.14,0,4)
RearWetLong=(1.0,1.14,0,4)
RearDrySlide=(1.0,1.14,0,4)
RearWetSlide=(1.0,1.14,0,4)
//RearCorneringStiffness=(1.0,0.95,0,4)  //10% cornering/braking stiffness increase over 9 upgrades
//RearBrakingStiffness=(1.0,0.95,0,4)
//RearSelfAligningStiffness=(1.0,0.95,0,4)

[ 本帖最后由 kloss 于 2009-10-28 19:42 编辑 ]

tanjie249

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tanjie249

tanjie249

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