There are certain things to be done, once you have completed your OPT with either Ace_DXF or OPTech.
Transparency & Illumination
While OPTech v1.1 includes these functions, so far OPT Enhancer was the more reliable tool for this.
Shading correction
A newer program XWA OPTer may be used to improve the OPTs appearance ingame, as it corrects various shading errors, that usually occurr with OPTs ingame.