bool CCreateRayFX::Update( float tmFrameTime )
{
//track our performance
CTimedSystemBlock TimingBlock(g_tsClientFXCreateRayFX);
//update our base object
BaseUpdate(tmFrameTime);
//we only want to create the effect as we become active
if(IsInitialFrame() && (GetProps()->m_nNumToCreate > 0))
{
//determine the object position and orientation of our object
LTVector vObjPos;
LTRotation rObjRot;
GetCurrentTransform(GetUnitLifetime(), vObjPos, rObjRot);
//handle two special pipelines to gain performance when there is no scattering
if(MATH_RADIANS_TO_DEGREES(GetProps()->m_fRandomCone) < 1.0f)
{
LTRigidTransform tHitTrans;
HOBJECT hHitObj;
//no scattering, just do a single intersection for all effects
if(DetermineIntersection(vObjPos, rObjRot.Forward(), hHitObj, tHitTrans))
{
//and now generate all of our effects
for(uint32 nCurrEffect = 0; nCurrEffect < GetProps()->m_nNumToCreate; nCurrEffect++)
{
CLIENTFX_CREATESTRUCT CreateStruct("", GetProps()->m_nFXFlags, hHitObj, tHitTrans);
CBaseCreateFX::CreateEffect(CreateStruct);
}
}
}
else
{
//we need to scatter
//extract our vectors from the orientation
LTVector vObjRight, vObjUp, vObjForward;
rObjRot.GetVectors(vObjRight, vObjUp, vObjForward);
//and now generate all of our effects
for(uint32 nCurrEffect = 0; nCurrEffect < GetProps()->m_nNumToCreate; nCurrEffect++)
{
LTRigidTransform tHitTrans;
HOBJECT hHitObj;
//now build up the forward within a specified cone
//first off spin it randomly around the forward
float fPlaneAngle = GetRandom(0.0f, MATH_CIRCLE);
LTVector vPlaneVector = vObjRight * cosf(fPlaneAngle) + vObjUp * sinf(fPlaneAngle);
//now tilt it away from the forward vector
float fTiltPercent = powf(GetRandom(0.0f, 1.0f), GetProps()->m_fCenterBias);
float fTiltAngle = fTiltPercent * GetProps()->m_fRandomCone;
LTVector vRandomForward = vObjForward * cosf(fTiltAngle) + vPlaneVector * sinf(fTiltAngle);
if(DetermineIntersection(vObjPos, vRandomForward, hHitObj, tHitTrans))
{
CLIENTFX_CREATESTRUCT CreateStruct("", GetProps()->m_nFXFlags, hHitObj, tHitTrans);
CBaseCreateFX::CreateEffect(CreateStruct);
}
}
}
}
//we always return false because we always want to be placed into a shutting down state since
//we just emit and then do nothing
return false;
}
