Hello all, I hope the Administrators will bear with me on this post. I was wondering how important Preview DirectX.10 was in relation to the effectiveness or otherwise to PMDG aircraft whether it is enabled or not. This question came about when I tried installing an addon airport and on running FSX the scenery was tearing and the FSX vehicles were unrecogniseable. On enquiring at the addon airport Forum a member suggested Disabling DirectX10 and the problem disappeared. Many thanks in advance. richard welsh.

It doesn't work properly, it mucks up some addons yet achieves very little => I don't use it. Weird innit ;)

DX10 in FSX means only problems, disable at once and never use it again

DX10 in FSX means only problems, disable at once and never use it again

Hi Bill and Grzegorz, I am not making contradictions here but I normally enable Preview Directx.10 and everything works ok. I disabled it and loaded a flight using MD11. I noticed the leading edge of the wings were multi coloured as were the fan blades. I ended the flight, enabled Directx and everything was back to normal. I only brought up the subject in relation to the addon airport in the original post. I am beginning to regret mentioning the original post if there seems to be a multitude of differing opinions for and against. Thanks anyway. richard welsh.

It doesn't work properly, it mucks up some addons yet achieves very little => I don't use it. Weird innit ;)

On my system it's a frame rate killer! Disabled.David DD

It gives me a little bit higher fps but messes up taxiways, some add-on scenery and aircraft, so I have disabled it.

Hello,I have discovered that with my Radeon HD 4600 videocard, if I do NOT use DirectX 10 preview, my FMC for example looks like it is torn. The characters in the FMC look as if they were ripped apart and glud together again.I don't have this with DirectX 10 preview on, so I leave it on. I wonder if this preview is Alpha or Beta?? :( :( Good luck,Wijnand (EHBK)

DX10 Preview mode also allows for VC self shadowing if it is enabled in the model (this works in the PMDG JS4100 for example).For self shadowing however, it is definitely not up to par with what you may be used to from other games (very blocky), and gets really messy with very complex geometry.

Grzegorz is spot on. For me DX10 'preview' mode screws up default airport taxiway markings, disables those progressive taxi arrows, most aircraft lights show up anymore, hits the FPS, most add-on planes and airports don't even work with it. You are best to ditch it and find a way to get it to run in the standard mode. The ONE thing that DX10 helped me with was to stop the black screen of death hangs, but HIGHMEMFIX=1 fixes that now so really, no more need for DX10 preview.

Just out of curiousity; will this fetuare been on the new NGX? I use DX10 mode quite a bit as a preference as I know how to manage the side effects:)Simon

My frames are a lot better with DX10 on... Wish it was the other way around!Sam N

Fellas!Forget dx10 with add-ons for fsx....if you run purely default fsx you will have some issues, if you use add-ons they will NOT be coded in for dx10 compatibility, simple as that!!!..just use dx9 on the ancient fsx code. :)

I don't use it and don't recommend using it - it causes a performance hit for me and it disables AA.

Thanks everyone for your input, the concensus of opinion seems to be, disable Preview Directx.10 richard welsh.