LotBlind: Created page with "[https://kb.speeddemosarchive.com/Thief_2:_The_Metal_Age Return to Main Page] = Potions = == Slow-fall == /* Potion's effect is to reduce gravity on the imbiber to 50%...."

2015-12-07T18:11:32Z

Created page with "[https://kb.speeddemosarchive.com/Thief_2:_The_Metal_Age Return to Main Page] = Potions = == Slow-fall == /* Potion's effect is to reduce gravity on the imbiber to 50%...."

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[https://kb.speeddemosarchive.com/Thief_2:_The_Metal_Age Return to Main Page]

= Potions =

== Slow-fall ==

/* Potion's effect is to reduce gravity on the imbiber to 50%.
Also reduces movement speed by 50%, keeping jump distance about
the same. Only supported for player-character imbiber.
*/
BEGIN_SCRIPT(LoGravPotion,TimedPotion)
METHODS:
METHOD void PotionEffect(object imbiber, boolean start)
{
if(!Object.InheritsFrom(imbiber,Object.Named("Avatar")))
return;
if(start)
{
vector vel;

// Arrest downward velocity by 50%. If you'd been at 50%
// gravity all along, you'd actually only be at 30% less
// velocity at the same depth (a factory of 1/root(2)).
// This will then tend to encourage use of the potion in
// mid-fall, which sounds like fun. -TJS
Physics.GetVelocity(imbiber,vel);
if(vel.z<0) vel.z/=2;
Physics.SetVelocity(imbiber,vel);

DrkInv.AddSpeedControl("LoGrav",0.5,1.0);
Physics.SetGravity(imbiber,0.50);
}
else
{
Physics.SetGravity(imbiber,1.00);
DrkInv.RemoveSpeedControl("LoGrav");
}
}
END_SCRIPT(LoGravPotion)

= Movement =

== Setting Velocity ==

This is what causes drinking slow-fall potions to free you from being stuck.

STDMETHOD(SetVelocity)(object obj, const vector ref vel)
{
// Setting velocities from scripts wants to be initially clear from the
// effects of friction, so we break all contacts.
cPhysModel *pModel = g_PhysModels.GetActive(obj);
if (pModel)
{
for (int i=0; i<pModel->NumSubModels(); i++)
{
pModel->DestroyAllTerrainContacts(i);
DestroyAllObjectContacts(obj, i, pModel);
}
}
PhysSetVelocity(obj, (mxs_vector*)&vel);
return S_OK;
}

Calling DestroyAllTerrainContacts also calls another method that makes you fall off any ropes.

= Mission-specific =

== Mission 6 Key Location ==

The mission source code basically takes a random number (and RNG seed is based on system uptime in miliseconds):
Code (MISS6.SCR):

#define KEYPATHS 9
[...]
SetData("PathNumber",Data.RandInt(1,KEYPATHS)); //which key we're using.
[...]
SetupLocation();
//setup the location, if we are the starting
//point. This allows all sorts of wholesome
//linky goodness.

There is also a game config cheat parameter to fix the key location to a specific one.

Thief 2/Source Code - Revision history

LotBlind: Created page with "[https://kb.speeddemosarchive.com/Thief_2:_The_Metal_Age Return to Main Page] = Potions = == Slow-fall == /* Potion's effect is to reduce gravity on the imbiber to 50%...."