How does the cameras in XSI work?

[wurp]

Often when I render i find the stuff Im rendering a bit squeezed, how come? How do I render out exactly what i see in the viewport without using the renderregion? When using for example maya everything you render comes out in the same ratio as in the viewport, how do you get the same result in XSI?

[atyss]

By default, XSI camera have a 0.9 pixel ratio, wich corresponds to the NTSC format (and maybe others all well, but I don't know).

It means that to meet North-America TV requirements, the pixel is vertically compressed, so for one pixel unit of base you have 0.9 pixel unit of height, instead of 1x1 like on computer and HDTV screens. See the following image:

You can see on the right grid that you use 10 pixels, but they are fitted in a measure of 9 pixels.

The 1x1 pixel ratio is called "square pixel ratio". When the image appears on TV screen the ratio is stretched vertically to give the same ratio as a square pixel image. This a broadcasting limitation

To change this you have to open the camera ppg and put 1 as pixel ratio. You might have to re-adjust the picture ratio after that.

You can automate this with a script.

Hope this helps
Salutations - Cheers
Bernard Lebel

[wurp]

Thanks for the answer, it helped me a lot. I gotta say that you always have very accurate and good answers to everything, keep that up!

Thanks

[atyss]

You're welcome!

Bernard