Adjusting background position
Hi,
I have a 8800x5664 background image I want to use in cylindrical projection for my 1800x1200 rendering.
But obviously there is a position problem, I can only see its sky.
Why isn't it possible to adjust Y-offset in this case?
Regards,
Alain
Views: 191
Replies to This Discussion
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Permalink Reply by Render Plus on
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you should be able to offset it.
but we have never tested it.
let us take a look
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Can you upload a smaller (e.g. 600 pixels wide) image of the actual background, and what it looks like when rendered.
If you simply want to move it up or down, you can just adjust the image itself.
I tested the Y-offset with cylindrical backgrounds and it didn't weem to do anything.
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Permalink Reply by Alain Bonnefoy on
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If you simply want to move it up or down, you can just adjust the image itself.
Don't really understand; How can I move it ?
How did you test Y-offset (even if it doesn't work) ? in KC11, the parameter is grayed. See the image.
In the joined image I have cut the upper image to adjust it on my horizon.
- Attachments:
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background.jpg, 83 KB
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I have made a test (see picture) cutting the upper part of the sky, according to some vizualisation as layers in GIMP, but difficult to figure out what the scaling will produce during rendering.
I have a view angle of 60 degrees with a resolution of 1800 and a background of 8800.
So if I understand well: 1800/60*360=10800 so the render scales the background by 10800/8800=1.23.
And in fact, I wonder how the Y-offset should work (when it will work ;) ). What is the offset value?
pixels before scaling or after scaling?
And in fact, I don't understand the result, I kept about 670 pixels over the horizon. It's about the size I have on my rendered image.
But, as you can see, the background horizon is at about (at the center of the image) 300 pixels from the top. If the image as been scaled by 1.23, I should have more sky than expected. It's not the case.
So where is the base of the image? top, bottom, center? I didn't check "Adjust center line to horizon".
Regards,
- Attachments:
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test cut bkgd.jpg, 560 KB
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Alain Bonnefoy said:
If you simply want to move it up or down, you can just adjust the image itself.
Don't really understand; How can I move it ?
How did you test Y-offset (even if it doesn't work) ? in KC11, the parameter is grayed. See the image.
In the joined image I have cut the upper image to adjust it on my horizon.
I meant that you could go into a paint program and add an additional, blank, area at the bottom or top of the image to cause it to offset.I "tested" Y-offset, by setting it before it grays out, and then checking cylindrical. However, while testing it I found a problem in that "Manual backgrounds" - a setting on the support dialog - was overriding the cylindrical setting.
I also found a bug where I was not able to load the support dialog to turn "manual backgrounds" off.
I will release a new version later today which fixes several of these problems. However I think that cylindrical backgrounds are not going to allow for Y-offsets.
I believe that your "cylindircal" background is going to need to have the horizon in the vertical center of these scene in order to work properly. The "horizon" in your image appears to be much higher. Try trimming the bottom of the image so the horizon is in the center.
(Send the original image to support@renderplus.com so I can use it for testing and make a version and try to get all of this working better)
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Ok Al
I'm sure being able to adjust Y position would be very helpfull.
I send you both background and an alpha transparent rendered image. Don't know if you can use it as foreground to mimic the rendering. I just would like to see some trees behind the scene.
I also want to say that I (and certainly all of us) greatly appreciate how you listen your customers and try to improve your product regarding our needs. That's really not always the case. So, beside iRender capabilities, I will recommend it mainly for that.
Thanks,
You should have received a download link via yousendit. Please tell me if it's ok.
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I tried to modify my background to get the horizon in the center and yes, it works fine.
Anyway, if it works, I suppose you manage Y offset in some way to get this result so, I suppose it should be possible to give a specific value in Y-off parameter for any fine adjustment. Could be helpfull.
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I spent some time looking at these backgrounds, and at cylindrical backgrounds.
We are putting out a new version today or tomorrow which does a much better job with the backgrounds.
However, Y-offset will still not work for Cylindrical Backgrounds.
The bottom line is that if you want good backgrounds, you will need to obtain high-resolution spherical HDRi backgrounds to use as sky and background.
For some backgrounds you can use planar images and the will work pretty well, but if you want the background to light the image, reflect on other objects and/or work well with various views, then HDRi is the best bet.
Here are some sources of HDRi skies and backgrounds:
HDRI Skies which can be used with IRender nXt are available at:
- www.accustudio.com - go to Exchange and then HDRI.
- ArchVision
- EverMotion
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From my point of view, that's a pity for Y offset.
One question anyway; About light and reflection, ok for HDRi skies but, about HDRi backgrounds it could be a bit different for reflection because in case of cylindrical projection, jpeg background can be reflected on object facing the camera. It seems that cannot be the case of planar HDRi background which are obviously behind the scene.
What do you think?
The problem about HDRis you are talking about is they are generally low resolution ones, almost unuseable unless to maybe, use it non visible, for light only. Good HDRi sky for 1680 rendering is a 10.000x10.000 and is quite expensive, about 100$.
So an intermediate solution could be to use a jpeg background, convert it to HDRi, which is not exactly the same result, I think, but not so bad, and use it in cylindrical projection, because spherical projection as iRender use for HDRi needs special images to not distort it. Would it be possible to use cylindrical projection instead of just planar?
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It seems that convert jpeg to HDRi (planar?) and use it in cylindrical projection is possible. Does it work?
But in that case what should be the sky mode? Automatic or HDRi? because HDRi is related to the images selected in the HDRi tab I think, no?
We see in the dialog below, the choosed image is .hdr, so is it ok? is it the image used toilluminate the sky? so, automatic sky?
I'm going to render it, to see.
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The Cylindrical radio button won't work for HDRi backgrounds.
You can convert the image to .HDRi as you have and then use if as a HDRi sky, rather than an HDRi Planar background. However, the top and bottom of the image will be distorted. Because HDRi assumes that the image is spherical.
I spent some time trying to find a "true" HDRi Cylindrical image on the web for testing, (to verify if there is such a thing - a switch set inside to say it is cylindical - and then to test if it works properly), but I couldn't find one anywhere. (If you can find one, then we can see if it would work)
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So an intermediate solution could be to use a jpeg background, convert it to HDRi, which is not exactly the same result, I think, but not so bad, and use it in cylindrical projection, because spherical projection as iRender use for HDRi needs special images to not distort it. Would it be possible to use cylindrical projection instead of just planar?
If you could find a program somewhere to convert the cylindrical image to a "true" HDRi cylindrical .HDR, then we could test it out. I always seem to run into problems finding an editor, etc. to use with HDRi.
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