Creating a basic ESP

[disco]

Posted by R4z8r.



This is probably nothing new, since okidoki ripped crysis apart already, but it wasnt posted here yet. If you don't got the Crysis sdk already, download it!

First we need to get the local entity/actor:

IActor* CBot::GetLocalPlayer()
{
    if(!System->GetIGame() )
        return 0;

    if(!System->GetIGame()->GetIGameFramework())
        return 0;

    return System->GetIGame()->GetIGameFramework()->GetClientActor();
}

IEntity* CBot::GetLocalEntity()
{
    IActor* Player = GetLocalPlayer();

    if(!Player)
        return 0;

    return Player->LinkedEntity;
}

Next we need to create an iterator, so we can loop through all the players + entities.

ActorIt = System->GetIGame()->GetIGameFramework()->GetIActorSystem()->CreateActorIterator();
IEntityIt* EntityIt = System->GetIEntitySystem()->GetEntityIterator();

We also need a WorldToScreen function( the one I am using is the one from the engine though ):

BOOL CBot::WorldToScreen(FLOAT* vEntPos, FLOAT* vOut)
{
    IRenderer* Renderer = System->GetIRenderer();

    Renderer->ProjectToScreen( vEntPos[0], vEntPos[1], vEntPos[2], &vOut[0], &vOut[1], &vOut[2] );

    vOut[0] *= ( Renderer->GetWidth()  / 100.0f );
    vOut[1] *= ( Renderer->GetHeight() / 100.0f );
    vOut[2] *= 1.0f;

    return ( (vOut[2] < 1.0f) );
}

We also want to use the bones, don't we?

Vec3 CBot::GetBoneOrigin( IEntity* Ent, CONST CHAR* szBoneName )
{
    if(!Ent->GetCharacter(0))
        return Vec3(0,0,0);

    ISkeletonPose* Skeleton = Ent->GetCharacter(0)->GetISkeletonPose();

    if(!Skeleton)
        return Vec3(0,0,0);

    uint16 BoneId = Skeleton->GetBoneIdByName( szBoneName );

    Vec3 vOffset = Skeleton->GetBoneById( BoneId )->vOffset;

    return (Ent->GetWorldPos() + vOffset);
}

Vec3 CBot::GetBoneOrigin( IEntity* Ent, uint16 BoneId )
{
    if(!Ent->GetCharacter(0))
        return Vec3(0,0,0);

    ISkeletonPose* Skeleton = Ent->GetCharacter(0)->GetISkeletonPose();

    if(!Skeleton)
        return Vec3(0,0,0);

    Vec3 vOffset = Skeleton->GetBoneById( BoneId )->vOffset;

    return (Ent->GetWorldPos() + vOffset);
}

Now we just need to loop through all players + entities:

for(; IActor* Player = ActorIt.get()->Next(); )
    {
        IEntity* Ent = Player->LinkedEntity;

        if( (!Player) || (Player == LocalPlayer) || (!Ent) )
            continue;

        if(!WorldToScreen( GetBoneOrigin( Ent, "Bip01 Neck" ), vOut ) )
            continue;

        if( (vOut[0] < 0) || (vOut[0] > pViewPort.Width) || (vOut[1] < 0) || (vOut[1] > pViewPort.Height) )
            continue;

if(pMenu.MySubMenu[ESP]->GetValueByName( "Name Esp" ) )
        {
            Draw.Text_Border( vOut[0] - 10.0f, vOut[1], dwColor, EspFont, "%s", Player->LinkedEntity->GetName() );
            vOut[1] += 13.0f;
        }

The bones that can be used:

CONST CHAR* BoneName[37] = {  
    "eye_left_bone",
    "eye_right_bone",
    "weapon_bone",
    "Bip01 Pelvis",
    "Bip01 Spine",
    "Bip01 L Thigh",
    "Bip01 R Thigh",
    "Bip01 Spine1",
    "Bip01 Spine2",
    "Bip01 Neck",
    "Bip01 Head",
    "Bip01 L Clavicle",
    "Bip01 R Clavicle",
    "Bip01 L UpperArm",
    "Bip01 L Forearm",
    "Bip01 L Hand",
    "Bip01 L Finger0",
    "Bip01 L Finger1",
    "Bip01 L Finger2",
    "Bip01 L Finger01",
    "Bip01 L Finger11",
    "Bip01 L Finger21",
    "Bip01 R UpperArm",
    "Bip01 R Forearm",
    "Bip01 R Hand",
    "Bip01 R Finger0",
    "Bip01 R Finger1",
    "Bip01 R Finger2",
    "Bip01 R Finger01",
    "Bip01 R Finger11",
    "Bip01 R Finger21",
    "Bip01 L Calf",
    "Bip01 L Foot",
    "Bip01 L Toe0",
    "Bip01 R Calf",
    "Bip01 R Foot",
    "Bip01 R Toe0",
};

Well, that's all I guess. Credits all go to okidoki, he did all the major work.

Have fun hacking,

R4z8r