Background questions

[aflack]

I have a sky applied as a background image and the same sky applied in the environment slot. When I render the image and view the background through glass it all blows out white, see the attached image.

 

Any idea why?

 

Also when I render is there a way to keep the original render already in the render box there without is all dissapearing and turning black before rendering again?

 

Thanks for your help.

[Arnold Sher]

hmmm... you need to tell us more detail in terms of what you are using... like Vray and whatever else... it looks overexposed... As for image going black, once again, we would need to get more detail... It is either your video card, which i suspect it is, or alternatively you have not set a camera in the scene and every time you import something into the scene it blows your camera view out...

[notamondayfan]

1st question, prob need something else to reflect the glass, or apply the sky map to the glass' reflection slot.

 

2nd question, i think i know what u mean. on the render window, hit the "Clone Rendered Frame Window" (symbol is 2 little white men). when u render this window will not change.

 

hope that helps mate!

[aflack]

Ok sorry I should have been a bit clearer.

 

I'm using Vray and max 7.

 

Do other people always use Sky domes, even for just still images? Don't people just apply and image to the viewport background slot and the same image to the environment map slot and then hit render? I know that if I stick and sky dome in I don't get the problem but it can take ages to set it up and get it looking right. Is it something to do with exposure control at the moment I am using no exposure control, do I need to use one of the others?

 

Thats for your help, I know about the clone image tool, but sometimes its just handy if you can render a region over the old image, so basically rendering the new bit in the context of the image.

 

Sometimes the original image stays in the render window, but other times the render will dissapear and everything will turn black again and then start to re-render.

[chuck]

not sure why that's happening, but i use skydomes in my stills. it gives all the glass at all angles something accurate to reflect. with a background image the clouds of the glass match the sky right behind it...doesn't look right.

 

http://www.rendercorestudios.com/h1.jpg

http://www.rendercorestudios.com/l1.jpg

 

hopefully you can tell the difference, these aren't great examples...

[William Alexander]

Looks like it could be a raytrace depth problem. Tracing is set to say a depth of 3 and requires more for proper reflections and or refractions to show up. Defaulting to a color, white in this case, can be an indication of this.

[aflack]

I tried the reflection depth but it still didn't make a difference.

 

So when any of you stick a background image in, stick a box in the middle of your render viewpoint, apply a vray material to it with refraction turned to white and reflection turned up you all get to view the background perfectly through the box and don't get it all blown out white?

[Logitek]

Sometimes the original image stays in the render window, but other times the render will dissapear and everything will turn black again and then start to re-render.

Hey Adam,

 

If you want to keep the render you've just done and test render just a small portion of your image, you can change the render type to "region" instead of View. When you hit render, a dotted square will appear in your active window and render only what's inside. That will save you a lot of time!

I hope this answered your question.

 

Cheers,

Matt