void CSimple3DEmitter::RenderParticles( CParticleRenderIterator *pIterator )
{
const Particle3D *pParticle = (const Particle3D *)pIterator->GetFirst();
while ( pParticle )
{
float sortKey = CurrentViewForward().Dot( CurrentViewOrigin() - pParticle->m_Pos );
// -------------------------------------------------------
// Set color based on direction towards camera
// -------------------------------------------------------
Vector color;
Vector vFaceNorm;
Vector vCameraToFace = (pParticle->m_Pos - CurrentViewOrigin());
AngleVectors(pParticle->m_vAngles,&vFaceNorm);
float flFacing = DotProduct(vCameraToFace,vFaceNorm);
if (flFacing <= 0)
{
color[0] = pParticle->m_uchFrontColor[0] / 255.0f;
color[1] = pParticle->m_uchFrontColor[1] / 255.0f;
color[2] = pParticle->m_uchFrontColor[2] / 255.0f;
}
else
{
color[0] = pParticle->m_uchBackColor[0] / 255.0f;
color[1] = pParticle->m_uchBackColor[1] / 255.0f;
color[2] = pParticle->m_uchBackColor[2] / 255.0f;
}
//Render it in world space
RenderParticle_ColorSizeAngles(
pIterator->GetParticleDraw(),
pParticle->m_Pos,
color,
pParticle->GetFadeFraction(),
pParticle->m_uchSize,
pParticle->m_vAngles);
pParticle = (const Particle3D *)pIterator->GetNext( sortKey );
}
}
//-----------------------------------------------------------------------------
// Purpose: Simulate and render the particle in this system
// Input : *pInParticle - particle to consider
// *pDraw - drawing utilities
// &sortKey - sorting key
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool CSimple3DEmitter::SimulateAndRender( Particle *pInParticle, ParticleDraw *pDraw, float &sortKey )
{
Particle3D *pParticle = (Particle3D *) pInParticle;
const float timeDelta = pDraw->GetTimeDelta();
//Should this particle die?
pParticle->m_flLifetime += timeDelta;
if ( pParticle->m_flLifetime >= pParticle->m_flDieTime )
return false;
sortKey = CurrentViewForward().Dot( CurrentViewOrigin() - pParticle->m_Pos );
// -------------------------------------------------------
// Set color based on direction towards camera
// -------------------------------------------------------
Vector color;
Vector vFaceNorm;
Vector vCameraToFace = (pParticle->m_Pos - CurrentViewOrigin());
AngleVectors(pParticle->m_vAngles,&vFaceNorm);
float flFacing = DotProduct(vCameraToFace,vFaceNorm);
if (flFacing <= 0)
{
color[0] = pParticle->m_uchFrontColor[0] / 255.0f;
color[1] = pParticle->m_uchFrontColor[1] / 255.0f;
color[2] = pParticle->m_uchFrontColor[2] / 255.0f;
}
else
{
color[0] = pParticle->m_uchBackColor[0] / 255.0f;
color[1] = pParticle->m_uchBackColor[1] / 255.0f;
color[2] = pParticle->m_uchBackColor[2] / 255.0f;
}
// Angular rotation
pParticle->m_vAngles.x += pParticle->m_flAngSpeed * timeDelta;
pParticle->m_vAngles.y += pParticle->m_flAngSpeed * timeDelta;
pParticle->m_vAngles.z += pParticle->m_flAngSpeed * timeDelta;
//Render it in world space
RenderParticle_ColorSizeAngles(
pDraw,
pParticle->m_Pos,
color,
1.0f - (pParticle->m_flLifetime / pParticle->m_flDieTime),
pParticle->m_uchSize,
pParticle->m_vAngles);
//Simulate the movement with collision
trace_t trace;
m_ParticleCollision.MoveParticle( pParticle->m_Pos, pParticle->m_vecVelocity, &pParticle->m_flAngSpeed, timeDelta, &trace );
// ---------------------------------------
// Decay towards flat
// ---------------------------------------
if (pParticle->m_flAngSpeed == 0 || trace.fraction != 1.0)
{
pParticle->m_vAngles.x = anglemod(pParticle->m_vAngles.x);
if (pParticle->m_vAngles.x < 180)
{
if (fabs(pParticle->m_vAngles.x - 90) > 0.5)
{
pParticle->m_vAngles.x = 0.5*pParticle->m_vAngles.x + 46;
}
}
else
{
if (fabs(pParticle->m_vAngles.x - 270) > 0.5)
{
pParticle->m_vAngles.x = 0.5*pParticle->m_vAngles.x + 135;
}
}
pParticle->m_vAngles.y = anglemod(pParticle->m_vAngles.y);
if (fabs(pParticle->m_vAngles.y) > 0.5)
{
pParticle->m_vAngles.y = 0.5*pParticle->m_vAngles.z;
}
}
return true;
}
