# PVRTMatrixPerspectiveFovRHF

**URL:** <https://forums.imgtec.com/t/pvrtmatrixperspectivefovrhf/449>\
**Category:** PowerVR Insider\
**Created:** [August 20, 2009, 2:43pm UTC](https://forums.imgtec.com/t/pvrtmatrixperspectivefovrhf/449 "2009-08-20T14:43:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![warmi](https://avatars.discourse-cdn.com/v4/letter/w/7ea924/32.png) [@warmi](https://forums.imgtec.com/u/warmi)\
**Post date:** [August 20, 2009, 2:43pm UTC](https://forums.imgtec.com/t/pvrtmatrixperspectivefovrhf/449/1 "2009-08-20T14:43:01Z")

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I am working with the emulator on windows.  
  
  
  
  
  
I have noticed something strange … when I create a regular 480x320 window , what I would call "a natural " landscape mode - everything displays fine.  
  
  
  
  
  
On the other hand if I create a 320x480 window and then use PVRTMatrixPerspectiveFovRHF with bRotate set to true to emulate landscape mode , everything displays fine again but it seems that all objects appear to be much closer to the viewer.  
  
  
  
  
  
It is really strange … I should get exactly the same display on both but rotating projection matrix gives me much smaller perceived FOV.  
  
  
To really get the same display I have to adjust my FOV from 45 degrees to 65 degrees when rotating the matrix.  
  
  
  
  
  
Am I missing something obvious here ?

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<div class="post-metadata">

**Author:** ![warmi](https://avatars.discourse-cdn.com/v4/letter/w/7ea924/32.png) [@warmi](https://forums.imgtec.com/u/warmi)\
**Post date:** [August 26, 2009, 1:26pm UTC](https://forums.imgtec.com/t/pvrtmatrixperspectivefovrhf/449/2 "2009-08-26T13:26:44Z")

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Uhh … never mind … it was a stupid mistake on my part.