message: account for density scale
diff: @@ -86,7 +86,8 @@ vec4f DRR_integrateVolumeInterval(const ScreenSample &sample,
  vec4f sampleColorOpacity = tf->get(tf, sample);
  sampleColorOpacity.w = 1.f
  - - pow(1.f - sampleColorOpacity.w, dt / interval.nominalDeltaT);
  + - pow(1.f - sampleColorOpacity.w * vm->densityScale,
  + dt / interval.nominalDeltaT);
  const float clampedOpacity = clamp(sampleColorOpacity.w);
  color = color
  + ((1.f - alpha) * clampedOpacity
  