void CNPC_Stalker::AddZigZagToPath(void)
{
// If already on a detour don't add a zigzag
if (GetNavigator()->GetCurWaypointFlags() & bits_WP_TO_DETOUR)
{
return;
}
// If enemy isn't facing me or occluded, don't add a zigzag
if (HasCondition(COND_ENEMY_OCCLUDED) || !HasCondition ( COND_ENEMY_FACING_ME ))
{
return;
}
Vector waypointPos = GetNavigator()->GetCurWaypointPos();
Vector waypointDir = (waypointPos - GetAbsOrigin());
// If the distance to the next node is greater than ZIG_ZAG_SIZE
// then add a random zig/zag to the path
if (waypointDir.LengthSqr() > ZIG_ZAG_SIZE)
{
// Pick a random distance for the zigzag (less that sqrt(ZIG_ZAG_SIZE)
float distance = random->RandomFloat( 30, 60 );
// Get me a vector orthogonal to the direction of motion
VectorNormalize( waypointDir );
Vector vDirUp(0,0,1);
Vector vDir;
CrossProduct( waypointDir, vDirUp, vDir);
// Pick a random direction (left/right) for the zigzag
if (random->RandomInt(0,1))
{
vDir = -1 * vDir;
}
// Get zigzag position in direction of target waypoint
Vector zigZagPos = GetAbsOrigin() + waypointDir * 60;
// Now offset
zigZagPos = zigZagPos + (vDir * distance);
// Now make sure that we can still get to the zigzag position and the waypoint
AIMoveTrace_t moveTrace1, moveTrace2;
GetMoveProbe()->MoveLimit( NAV_GROUND, GetAbsOrigin(), zigZagPos, GetAITraceMask(), NULL, &moveTrace1);
GetMoveProbe()->MoveLimit( NAV_GROUND, zigZagPos, waypointPos, GetAITraceMask(), NULL, &moveTrace2);
if ( !IsMoveBlocked( moveTrace1 ) && !IsMoveBlocked( moveTrace2 ) )
{
GetNavigator()->PrependWaypoint( zigZagPos, NAV_GROUND, bits_WP_TO_DETOUR );
}
}
}
//------------------------------------------------------------------------------
// Purpose :
// Input :
// Output :
//------------------------------------------------------------------------------
Vector CAI_BaseFlyingBot::VelocityToAvoidObstacles(float flInterval)
{
// --------------------------------
// Avoid banging into stuff
// --------------------------------
trace_t tr;
Vector vTravelDir = m_vCurrentVelocity*flInterval;
Vector endPos = GetAbsOrigin() + vTravelDir;
AI_TraceEntity( this, GetAbsOrigin(), endPos, GetAITraceMask()|CONTENTS_WATER, &tr );
if (tr.fraction != 1.0)
{
// Bounce off in normal
Vector vBounce = tr.plane.normal * 0.5 * m_vCurrentVelocity.Length();
return (vBounce);
}
// --------------------------------
// Try to remain above the ground.
// --------------------------------
float flMinGroundDist = MinGroundDist();
AI_TraceLine(GetAbsOrigin(), GetAbsOrigin() + Vector(0, 0, -flMinGroundDist),
GetAITraceMask_BrushOnly()|CONTENTS_WATER, this, COLLISION_GROUP_NONE, &tr);
if (tr.fraction < 1)
{
// Clamp veloctiy
if (tr.fraction < 0.1)
{
tr.fraction = 0.1;
}
return Vector(0, 0, 50/tr.fraction);
}
return vec3_origin;
}
