void FormatViewModelAttachment( Vector &vOrigin, bool bInverse )
{
// Presumably, SetUpView has been called so we know our FOV and render origin.
const CViewSetup *pViewSetup = view->GetPlayerViewSetup();
float worldx = tan( pViewSetup->fov * M_PI/360.0 );
float viewx = tan( pViewSetup->fovViewmodel * M_PI/360.0 );
// aspect ratio cancels out, so only need one factor
// the difference between the screen coordinates of the 2 systems is the ratio
// of the coefficients of the projection matrices (tan (fov/2) is that coefficient)
float factorX = worldx / viewx;
float factorY = factorX;
// Get the coordinates in the viewer's space.
Vector tmp = vOrigin - pViewSetup->origin;
Vector vTransformed( MainViewRight().Dot( tmp ), MainViewUp().Dot( tmp ), MainViewForward().Dot( tmp ) );
// Now squash X and Y.
if ( bInverse )
{
if ( factorX != 0 && factorY != 0 )
{
vTransformed.x /= factorX;
vTransformed.y /= factorY;
}
else
{
vTransformed.x = 0.0f;
vTransformed.y = 0.0f;
}
}
else
{
vTransformed.x *= factorX;
vTransformed.y *= factorY;
}
// Transform back to world space.
Vector vOut = (MainViewRight() * vTransformed.x) + (MainViewUp() * vTransformed.y) + (MainViewForward() * vTransformed.z);
vOrigin = pViewSetup->origin + vOut;
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void C_EnvStarfield::ClientThink( void )
{
if ( !m_bOn || !m_flDensity )
return;
PMaterialHandle hParticleMaterial = m_pEmitter->GetPMaterial( "effects/spark_noz" );
// Find a start & end point for the particle
// Start particles straight ahead of the client
Vector vecViewOrigin = MainViewOrigin(engine->GetActiveSplitScreenPlayerSlot());
// Determine the number of particles
m_flNumParticles += 1.0 * (m_flDensity);
int iNumParticles = floor(m_flNumParticles);
m_flNumParticles -= iNumParticles;
// Add particles
for ( int i = 0; i < iNumParticles; i++ )
{
float flDiameter = cl_starfield_diameter.GetFloat();
Vector vecStart = vecViewOrigin + (MainViewForward(engine->GetActiveSplitScreenPlayerSlot()) * cl_starfield_distance.GetFloat() );
Vector vecEnd = vecViewOrigin + (MainViewRight(engine->GetActiveSplitScreenPlayerSlot()) * RandomFloat(-flDiameter,flDiameter)) + (MainViewUp(engine->GetActiveSplitScreenPlayerSlot()) * RandomFloat(-flDiameter,flDiameter));
Vector vecDir = (vecEnd - vecStart);
float flDistance = VectorNormalize( vecDir );
float flTravelTime = 2.0;
// Start a random amount along the path
vecStart += vecDir * ( RandomFloat(0.1,0.3) * flDistance );
TrailParticle *pParticle = (TrailParticle *) m_pEmitter->AddParticle( sizeof(TrailParticle), hParticleMaterial, vecStart );
if ( pParticle )
{
pParticle->m_vecVelocity = vecDir * (flDistance / flTravelTime);
pParticle->m_flDieTime = flTravelTime;
pParticle->m_flLifetime = 0;
pParticle->m_flWidth = RandomFloat( 1, 3 );
pParticle->m_flLength = RandomFloat( 0.05, 0.4 );
pParticle->m_color.r = 255;
pParticle->m_color.g = 255;
pParticle->m_color.b = 255;
pParticle->m_color.a = 255;
}
}
}