message: tweak per-group transparency cutoff
diff: @@ -86,7 +86,7 @@ export const assign_material_color = `
  // apply per-group transparency
  #if defined(dTransparency) && (defined(dRenderVariant_pick) || defined(dRenderVariant_color))
  float ta = 1.0 - vTransparency;
  - if (vTransparency < 0.2) ta = 1.0; // hard cutoff looks better
  + if (vTransparency < 0.09) ta = 1.0; // hard cutoff looks better
  #if defined(dRenderVariant_pick)
  if (ta < uPickingAlphaThreshold)
  