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Movement/Physics (Gravity) - Printable Version

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+--- Thread: Movement/Physics (Gravity) (/showthread.php?tid=2957)

Movement/Physics (Gravity) - Boop - 05-27-2009

I remember someone(genevrier , I think , but I can't find the post so I might be wrong) asking how to manipulate gravity. Well I decided to look into it today (because I had lots of free time) and I found this function:

Click me!

Now some interesting stuff is here:
Code:
0040E6FB  |. DC05 60834400  FADD QWORD PTR DS:[448360]               ;  first one - 1.13333
0040E701  |. E9 8B000000    JMP lf2_load.0040E791
0040E706  |> 83F8 04        CMP EAX,4
0040E709  |. 75 0B          JNZ SHORT lf2_load.0040E716
0040E70B  |. DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E70E     DC05 187A4400  FADD QWORD PTR DS:[447A18]               ;  2nd one - 0.85
0040E714  |. EB 7B          JMP SHORT lf2_load.0040E791
0040E716  |> 8B56 70        MOV EDX,DWORD PTR DS:[ESI+70]
0040E719  |. 69D2 78010000  IMUL EDX,EDX,178
0040E71F  |. 8B840A AC07000>MOV EAX,DWORD PTR DS:[EDX+ECX+7AC]
0040E726  |. 3D EA030000    CMP EAX,3EA
0040E72B  |. 75 5B          JNZ SHORT lf2_load.0040E788
0040E72D  |. 83B9 F4060000 >CMP DWORD PTR DS:[ECX+6F4],7C
0040E734  |. 75 0B          JNZ SHORT lf2_load.0040E741
0040E736  |. DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E739  |. DC05 58834400  FADD QWORD PTR DS:[448358]               ;  3rd one - 0.17
0040E73F  |. EB 50          JMP SHORT lf2_load.0040E791
0040E741  |> 3D EA030000    CMP EAX,3EA
0040E746  |. 75 40          JNZ SHORT lf2_load.0040E788
0040E748  |. 39B9 F4060000  CMP DWORD PTR DS:[ECX+6F4],EDI
0040E74E  |. 75 0B          JNZ SHORT lf2_load.0040E75B
0040E750  |. DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E753  |. DC05 50834400  FADD QWORD PTR DS:[448350]               ;  4th one - 0.425
0040E759  |. EB 36          JMP SHORT lf2_load.0040E791
0040E75B  |> 3D EA030000    CMP EAX,3EA
0040E760  |. 75 26          JNZ SHORT lf2_load.0040E788
0040E762  |. 83B9 F4060000 >CMP DWORD PTR DS:[ECX+6F4],65
0040E769  |. 75 0B          JNZ SHORT lf2_load.0040E776
0040E76B  |. DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E76E  |. DC05 60834400  FADD QWORD PTR DS:[448360]               ;  5th one - 1.1333333
0040E774  |. EB 1B          JMP SHORT lf2_load.0040E791
0040E776  |> 3D EA030000    CMP EAX,3EA
0040E77B  |. 75 0B          JNZ SHORT lf2_load.0040E788
0040E77D  |. DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E780  |. DC05 48834400  FADD QWORD PTR DS:[448348]               ;  6th one - 0.56666667
0040E786  |. EB 09          JMP SHORT lf2_load.0040E791
0040E788  |> DD46 48        FLD QWORD PTR DS:[ESI+48]
0040E78B  |. DC05 40834400  FADD QWORD PTR DS:[448340]               ;  Main Gravity - 1.7


1.7 is the gravity for type 0 characters. It is stored in 448340 - a constant variable. It doesn't get changed anywhere. If you set it to 1, then gravity is a lot lower and it's cool and stuff :p.

The problem is it doesn't affect the other object types :(. And it looks like every item has it's own stupid value :(.


Anyway, just posting my findings :).

Have fun.

RE: Movement/Physics (Gravity) - Ascor - 05-28-2009

that awesome
is there a possibility to do that with special backgrounds?

RE: Movement/Physics (Gravity) - Boop - 05-29-2009

I made a gravity function:
Code:
.data
Grav    REAL8 0.5

Grav_r dd 0040E794h

.Code
Gravity proc
    
                cmp     eax, 6
                jnz     short loc_40E706
                fld     qword ptr ds:[448360h]
                fmul    qword ptr ds:[Grav]
                fld     qword ptr [esi+48h]
                
                jmp     loc_40E791
; ---------------------------------------------------------------------------

loc_40E706:                             ; CODE XREF: sub_40E490+266j
                cmp     eax, 4
                jnz     short loc_40E716
                fld     qword ptr ds:[447A18h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                
                jmp     loc_40E791
; ---------------------------------------------------------------------------

loc_40E716:                             ; CODE XREF: sub_40E490+279j
                mov     edx, [esi+70h]
                imul    edx, 178h
                mov     eax, [edx+ecx+7ACh]
                cmp     eax, 3EAh
                jnz     short loc_40E788
                cmp     dword ptr [ecx+6F4h], 7Ch
                jnz     short loc_40E741
                fld     qword ptr ds:[448358h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                
                jmp     short loc_40E791
; ---------------------------------------------------------------------------

loc_40E741:                             ; CODE XREF: sub_40E490+2A4j
                cmp     eax, 3EAh
                jnz     short loc_40E788
                cmp     [ecx+6F4h], edi
                jnz     short loc_40E75B
                fld     qword ptr ds:[448350h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                jmp     short loc_40E791
; ---------------------------------------------------------------------------

loc_40E75B:                             ; CODE XREF: sub_40E490+2BEj
                cmp     eax, 3EAh
                jnz     short loc_40E788
                cmp     dword ptr [ecx+6F4h], 65h
                jnz     short loc_40E776
                fld     qword ptr ds:[448360h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                
                jmp     short loc_40E791
; ---------------------------------------------------------------------------

loc_40E776:                             ; CODE XREF: sub_40E490+2D9j
                cmp     eax, 3EAh
                jnz     short loc_40E788
                fld     qword ptr ds:[448348h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                
                jmp     short loc_40E791
; ---------------------------------------------------------------------------

loc_40E788:                             ; CODE XREF: sub_40E490+29Bj
                                        ; sub_40E490+2B6j ...
                fld     qword ptr ds:[448340h]
                fmul    qword ptr ds:[Grav]
                fadd    qword ptr [esi+48h]
                

loc_40E791:                             ; CODE XREF: sub_40E490+271j
                                        ; sub_40E490+284j ...
                fstp    qword ptr [esi+48h]
                
                jmp [Grav_r]


Gravity endp

invoke JmpPatch,0040E6F3h, addr Gravity

Grav is the factor by which all the Gravity stuff is multiplied. The function is still buggy (I think I'm multiplying variables I shouldn't be touching :p), so some times items don't fall or something. Not sure really :p. Anyway have fun :D.


[youtube]K-cMcO7D4rc[/youtube]
A bad video showing how gravity is affected when you half it(I know it's not a very good demonstration, but yeah :p).

RE: Movement/Physics (Gravity) - Ascor - 05-29-2009

f*** this is awesome
can henry jump forever with this or is it limited?

RE: Movement/Physics (Gravity) - Drahcir - 05-30-2009

I really think we could use this in the forum mod.

RE: Movement/Physics (Gravity) - JossuaDC - 05-30-2009

(05-30-2009, 06:46 PM)Drahcir Wrote:  I really think we could use this in the forum mod.
Hell no.






HÉÉÉÉÉÉÉÉLL NO.

RE: Movement/Physics (Gravity) - Drahcir - 05-31-2009

^No, but say Genevrier could get it to vary between backgrounds...

RE: Movement/Physics (Gravity) - Bamboori - 05-31-2009

maybe we could use that for a special planer with extreme low/high gravity

RE: Movement/Physics (Gravity) - The Lost Global Mod - 06-01-2009

this is getting offtopic, guys. Talk about such stuff in the forum mod section.
Thank you.

to the topic:

nice job, as always! keep it up.. you rock