Noob: How Would I Trap This DX Error?

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I'm somewhat of a noob on the whole TFT, LCD stuff, I've been a CRT user forever. Perhaps you could explain what TFT interpolation is? If that means the monitor scaling the image to run in a resolution it does not support, then I havn't seen a problem yet.

I've tested my game which uses the projection matrix to scale to the device, on over 12 LCD monitors now. (I'm taking my game demo on a flash drive to several stores) And it looks fine. Perhaps since it appears it's always going to scale up and not down, there's not a problem? I could understand if it has to scale down, there could be more graphic issues.

So...what TFT interpolation problems have you come across? Thanks.