T3D 1.1 Beta 3 - Additive Particle issue - LOGGED

I'm having a few issues getting the particle effects working properly in my game. Whenever the particles are set to use additive blending, they don't seem to render properly against objects in the fore and middle grounds.

Around the 0:05 to 0:06 mark on this video you can see the issue in action: the thruster particle effects aren't really visible in front of the models, terrain, or the like -- but render fine against the scattersky.



Using the default particle datablocks in the beta 3 FPS demo, I get identical results. The following screenshots pretty much sum it up -- over buildings and so on in the foreground, the particles with additive blending become so faint they're almost invisible -- but against objects in the background they render fine.




Am I missing something here? Do I have the wrong handle on how additive blending should be working?

Here's the datablocks from script that are being used. They look fine to me...

datablock ParticleData(DefaultParticle)
{
   textureName = "core/art/defaultParticle";
   dragCoeffiecient = 0;
   gravityCoefficient = 0;
   inheritedVelFactor = 0.499022;
   constantAcceleration = 0.0;
   lifetimeMS = 1313;
   lifetimeVarianceMS = 1312;
   useInvAlpha = true;
   spinRandomMin = -360;
   spinRandomMax = 360;
   spinSpeed = 1;

   colors[0] = "0.992126 0.00787402 0.0314961 1";
   colors[1] = "1 0.834646 0 0.645669";
   colors[2] = "1 0.299213 0 0.330709";
   colors[3] = "0.732283 1 0 0";
   
   sizes[0] = 0;
   sizes[1] = 0.497467;
   sizes[2] = 0.73857;
   sizes[3] = 0.997986;
   
   times[0] = 0.0;
   times[1] = 0.247059;
   times[2] = 0.494118;
   times[3] = 1;
   
   animTexName = "core/art/defaultParticle";
   
   dragCoefficient = "0.498534";
};

datablock ParticleEmitterData(DefaultEmitter)
{
   ejectionPeriodMS = "50";
   ejectionVelocity = "1";
   velocityVariance = "0";
   ejectionOffset = "0.2";
   thetaMax = "40";
   particles = "DefaultParticle";
   blendStyle = "ADDITIVE";
   softParticles = "0";
   softnessDistance = "1000";
};