CGTalk - Render Window acting strange

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Chaduke

04-15-2009, 03:14 AM

I switched around between some different render sizes and aspect ratios in a scene, then all of a sudden it started doing something weird. As far as I can tell everything is set correctly. The size is 800 x 600 and the aspect is 1 and 1. When I render it appears to be rendering only the bottom half of the window and then scaling up the image 200% on the vertical axis to fill the window. I'm looking everywhere in my render settings and can't figure out why its doing this or how it got this way. If I open up a new scene it renders normally, so its not a huge deal but I sure would like to figure this out.

Ian Jones

04-15-2009, 06:17 AM

Only scaling on the vertical axis? or scaling x and y? scroll the mouse wheel to zoom, see what happens.

Chaduke

04-15-2009, 07:43 AM

The mousewheel functions normally as it does after a render zooming in and out.

Let me be more specific. I click render or hit F12, the render window appears. Its sized at 800 x 600. The rendering takes place on only the bottom half of the render window, the image itself looks squashed to half its normal height. It looks like the image would be 800x300 and takes up the bottom half of the render window, the top half is black. Then, immediately after the rendering is finished, the image pops up and fills the whole render window as if it were scaled to twice its height to make it fit. I can't really tell if the final image is correct, it looks a little strange.

This is only happening on one scene file. If I create a new scene rendering is normal, where it starts in the middle and renders outward in a circular pattern.

fktt

04-15-2009, 07:51 AM

This could be a bug, but before we make that assumption,
maybe you could post a few screenshots of your render setings,
or even better would be the .blend file.

eg. if I'd try rendering the .blend, and it would work fine,
without changing any render settings then,
it may probably be a bug with the build your using.

Chaduke

04-15-2009, 07:56 AM

Here is a link to the .blend file Maybe it will do the same thing on other machines:

http://www.chaduke.com/misc/dude.blend

Chaduke

04-15-2009, 02:56 PM

Just to verify, I tried it on my Windows XP box at work and it does the same thing, at home I use Vista.

Mordachai

04-15-2009, 03:12 PM

Hi,

No bug at all.

Just go to the Scene Menu [F10] >> Render panel and disable the button 'Fields'.

When you choose 'Default' in the Format panel Blender automatically turn on this option. Some information about field rendering can be found here: http://www.mcqpro.com/html/FieldRendering.html

Chaduke

04-15-2009, 03:51 PM

Nice Mordachai, I figured it was something like that. I also got to learn something new in the process. I do have a question about the article you posted. Do the newer HiDef televisions and devices change the criteria for this, ie. does it still apply?

Ian Jones

04-16-2009, 04:44 PM

HD can come in both interlaced and progressive... so the options are better, but still it is necessary to understand fields.

HD 1080i is interlaced...
HD 1080p is progressive...

So when talking technically about a format, you need to mention the p or i as it is important.

fktt

04-16-2009, 11:45 PM

Ian Jones

04-17-2009, 01:16 AM

Haha yes, but lets not melt anyone's heart yet...

kernond

04-17-2009, 01:34 AM

That was a weird situation. I was thinking that it was your aspect setting conflicting with your pixel resolution setting. 800x600 is not a 1:1 ratio, so I figured the scaling or stretching would be the result of trying to render 800x600 with a 1:1 ratio.

So, disabling the Fields setting fixed it?

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