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[sucahyo]

This thread is like a dream come true .
For long time now, I try to make/find code to make it possible for car to roll over or flip in gran turismo 2.
is that possible?

all that I able to do is making autopilot code or direct to replay code.

[Hybrid]

well i'll check it out not sure of what i could do

[sucahyo]

Thanks .
I don't know if this can help or not, maybe the car roll angle address (2 byte) for NTSC 1.2 GT2:
801FF1C7
801FF1D7
801FF1E7
801FF1F7

[Hybrid]

those addresses did nothing on both of the disks
sorry

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[sucahyo]

Those address show some value that seem related to car roll angle. When the car roll to the left it's value reduce, when the car roll to the right it's value increased. I only use PEC, so I can't find out what change it. I can't run PSX too .

[Hybrid]

which of the modes are you playing on?

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[sucahyo]

oops sorry, simulation mode GT2 NTSC 1.2.

[Hybrid]

well Sucahyo it seems like you have the code hacked already
try refering to a hacking Faq to see what code types you need to use

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[sucahyo]

well Sucahyo it seems like you have the code hacked already
try refering to a hacking Faq to see what code types you need to use

Allowed car to flip code? Can you point which? since I can't find it. Although I do find some usefull doc for psx assembly. or is it The Walk Thru Walls FAQ?

I recently found code for car x,y,z position, car x,y,z angle (pitch, yaw, roll), and car x,y,z speed. The car position code will move the car to the new position, but the car pitch or roll will revert back to 512 if I put bigger value. The Walk Thru Walls FAQ do not work for car pitch and roll.

I will continue to try to find it.

[Hybrid]

the roll controlls what?


is it 512 hex?
from the sound of what you are saying
you may have to use multiple "joker"

ie
D0???? ????(joker for gas and left)
D0???? ???? (speed equal to)
1????? ???? (increase/decrese roll to make car roll left)
then the same thing for the right

basically what it is saying is if you are pressing the gas and left/right and your speed is equal to that it makes the car roll left or right you might want to set another joker into it so it works also if your car is at a certain angle


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[sucahyo]

the roll controlls what?


is it 512 hex?
from the sound of what you are saying
you may have to use multiple "joker"

ie
D0???? ????(joker for gas and left)
D0???? ???? (speed equal to)
1????? ???? (increase/decrese roll to make car roll left)
then the same thing for the right

basically what it is saying is if you are pressing the gas and left/right and your speed is equal to that it makes the car roll left or right you might want to set another joker into it so it works also if your car is at a certain angle

GT2 is car simulator. But it prevent any car from going upside down. The roll is variable that set and display the amount of car angled in X axis. It should be from -2048 to 2048, but GT2 will prevent any value bellow -512 or above 512.

in decimal:

car pitch value, rotation in Y axis
800A9CF8 ????
0 = level
limited to = 512 and -512

car roll value, rotation in X axis
800A9CFA ????
0 = level
limited to = 512 and -512

car yaw value, rotation in Z axis
800A9CFC ????
0 = heading north
1024 = 90 degree ccw/west, no limit

Joker command will work on yaw. But I can't use joker for pitch and roll because GT2 will reset any value above 512 to 512, below -512 to -512. I think joker command can be use to reset upside own car (which is never happen without the never exist flip code).

I intend to find the code that reset those value, but I still inexperience, I may never make it. In my assumption, GT2 fli preventer code will compare those variable, if it goes beyond 512 it will assign 512 to it. I need to find and bypass those code.

If this code can be found, there is strong chance that it will work the same way in GT4 or any other GT.

There still many people playing GT2, or even GT1 . Many critizise the car inability to flip (but still love it anyway).

[Hybrid]

that i may not be able to help you with because if you are talking about negative values thats under a completely diffrent values if your talking going through a GSpro. i forget what the exact point of zero is then again it may be completely diffrent.

[sucahyo]

I see, GT2 in epsxe PEC, zero is 0, -512 is FE00, and 512 is 0200.
Any hint of what assembly instruction that I should look for?

[Hybrid]

no clue about ASM Hacking sorry

[sucahyo]

ok, thanks anyway.