Hello, is there plans implementing this? i mean a way to shift the " film back" of the camera, it's very useful to get the horizon not on the middle of the frame (without tilting the camera), great for architectural and landscaping, it was implemented in the first bryce iteration, in modo and i suppose in a few apps, its the same as cropping a larger image but more convenient imho
I have no idea what you mean?
me neither
In photography, a photographer shifts part of the lens up or down relative to the rest of the camera in order to keep parallel lines of a subject parallel to the filmback. This means that you don't end up with converging lines in perspective. Something that is most noticable for instance when photographing a tall building and tilting the camera upwards. As can be seen in this (http://famouswonders.com/wp-content/uploads/2010/11/KLCC_twin_towers1.jpg) picture. This effect can be deemed undesirable. So by shifting a lens (or the filmback) instead you can essentially aim the camera and frame the subject without having to resort to tilting.
Here (http://www.motoyuk.com/wp-content/uploads/2010/07/Shifting_Diagram.jpg)'s a decent diagram illustrating the differences.
And here's (http://photo.net/equipment/canon/tilt-shift) a decent explanation of the phenomenon.
:) exacttly, when you se the crop feature of the render you do exactly this, for example you need an image with the 1:2 ratio but you dont want to get horizon to be on the middle of the image AND you dont want to tilt the camera because it will distort the perspective view, you have to render an image say to 1:1 ratio to get room to do a crop region render to 1:2, possible but not convenient. as dutchdimensions said it is very common in architectural or studio photography to get vertical lines stay vertical...
can you use the (render) camera's fov and focal length settings?
I think Orthagional mode will cover a lot of this for stills of large objects and the like.
Quote from: N810 on November 01, 2011, 11:54:27 AM
I think Orthagional mode will cover a lot of this for stills of large objects and the like.
That's really not the same as orthogonal views have no perspective at all.
I noticed this (not always) desirable angle of objects in a large render I made. Here's a small section from the upper right corner, where you see the converging trees (and buildings).
There are no immediate plans to add this. Using 'crop region' allows you to achieve the same effect, except that you have black areas outside there rendered area.
lens correction from photoshop...
thank you very much for the explaination
it is far better to use the crop way rather than using a lens correction in ps as the lens correction involve bicubic interpolation and will always decrease quality a little
What is been discussed here is called Tilt Shift Photography and is normally the preserve of the 4 x 5 Large Format Cameras with bellows lenses, that allow the lens to be moved relative to the film plane as described by DutchDimension, for the correction of converging verticals in architectural photography (Chiefly) but have other applications as well.
Regards to you.
Cyber-Angel
Actually, they are simply referred to as camera movements - it can be tilt (tip forward or back), shift (move up, down, left or right) or it can be a swing (pivot left or right) of the film back, or it can be tilt, shift or swing of the lens ... or it can be any combination of all six. And, while a correction of keystoning is a common use in architectural photography, it is equally as often (if not more) used for maximizing or minimizing depth of field in a photograph in fields such as product or landscape photography. Most often, it was used to help maximize depth of field due to the fact that, when using larger formats for image recording, the depth of field becomes much more pronounced and shallow, hence the use of smaller and smaller apertures (including apertures as small as f/128 or smaller). This led to the name of the "f/64 Club" referring to Ansel Adams and other landscape photographers of the day who commonly worked in large format, at small aperture.
Using the movements of the front or rear standard of large format cameras allowed them to bring important elements of the scene parallel with the film plane, resulting in them rending those elements in focus in the final image. One great example is using a forward tilt of both lens and film standards to bring the scene more parallel to the film plane, allowing a foreground of flowers to render just as sharply as distant mountains without the need to use tiny apertures, which inevitably degrades image quality due to the effect of refraction at those small apertures and adds the additional challenge of longer shutter speeds which can allow elements (such as flowers swaying in a breeze) to blur.
Obviously, MAXIMIZING DOF is not an issue in a 3D rendered landscape as, by default, everything is sharp! However, the movements could just as easily be used to MINIMIZE DOF resulting in razor thin areas of sharp focus in an image by tilting or swinging the lens or film planes so that only a small portion of the film plane intersects with the plane of focus.
This has been most recently re-popularized with the "diorama" style photography of towns and cities using a Tilt Shift lens on a 35mm style camera. These lenses offer Tilt and Shift capabilities, but typically no swing movements.
It would certainly be interesting to see effects such as these emulated in a renderer! I don't know how useful :), but interesting all the same.
~Micheal