creo4 config.pro option documentation for: BLENDED_TRANSPARENCY

blended_transparency
independent
*
, yes
, no
independent
- Gives a high-quality, order-independent transparent effect to the model. The effect is produced from hardware-accelerated graphics cards.
yes
- Transparent colors appear using alpha blending when the model is shaded only when the graphics configuration (graphics card and Creo Parametric
graphics setting) supports it.