Pixelated refelections in glass

[Three D]

Hi. Would anybody have any idea why my HDRi sky is rendering pixelated in the window reflections on the attached image?

 

My setup follows Peter Guthrie's format -

http://www.peterguthrie.net/blog/2010/04/vraysun-and-hdri-sky-tutorial/

I'm using a Vray Sun and a Vray Dome Light with a HDRi file mapped to it.

 

Any help would be very much appreciated.

 

Thanks

[-MerlyN-]

My very first thought would be either reflection subdivisions are set to 0 or 1 and the 2nd thought might be the reflection map is a very low res image

[azeta3d]

yep, may be what merlyn said or maybe a geometry isse, is your glass subdivided about at the pixels size? if it is, add a smooth modifier, if not, try merlyn´s words lol

[Three D]

Thanks for you advice guys but it turns out it is was something in my glas material. I used a different glass material and it was fine. If I get a chance to examine the original glass material and find out what cause dit I'll let you know.