2 point perspective photomatch
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im trying to build a building from a photo, the photo has been corrected with 2 point perspective (where all vertical lines are straight) sketchup has a built in 2 point perspective mode, there should be an option in the photomatch panel to force 2 point perspective mode...
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Is this of any help? Haven't tried to apply it yet, but the tut seems reasonable. As I said before, it was previously posted by irender.
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@malaise said:
Ps : could you give us how you've made this small running insect ?
It's a simple, animated gif image - copy it from here:
http://i167.photobucket.com/albums/u143/FreeAgent84/bug.gif(To tell the truth, I blocked it as I always think there's a bug running up and down my screen)
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THanks Gaius
The first time I thought exactly the same! But in winter there are less insects.....
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Hi Free Agent
May be this could help you. Before using photomatch, you may correct the aberrations coming from the
camera itself. Here is a link you could use :
http://graphics.cs.msu.ru/ (english version )
Then Photomatch gives better results.Ps : could you give us how you've made this small running insect ?
MALAISE
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haha that bug...you could just right click on it and save as...
honoluludesktop: ive tried that already its helpfull (and interesting) but doesnt work for my image, as the tut says it only works on ideal images.
MALAISE: could you point me in the right dirrection on that site, cant see where on that site would help me, thank you though.
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Hi Free Agent, sorry this site has been modified. I don't find anymore the program I spoke about.
I would be please to send you a copy, but due to safety reasons, I ll try to zip it before.
MALAISE
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Malaise OOPS, Free Agent, Well, finally got around to giving photomatch a first try. OK, if you look at the perspective lines when they first display, they are in 2 point perspective. The problem for me was to easily match the yellow horizon line to the photo horizon, without twisting the grid too far out of shape.
One way, perhaps not the best (but the easiest for me) is to place the photo horizon in the center of the photo before opening it in sketch up. Also, this worked for me. See "Creating a 3D Model to Match a Photo". First set the origin, then adjust the red and yellow axis, making sure that the blue axis returns to vertical (2 point perspective).
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honoluludesktop: did u just try photomatch or did u try photomatch with a photograph that has a 2 point perspective?
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I exported a 2 point perspective of a house model as a jpg; then in a new (empty)SU file, added it by photomatch.
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From the sketchup help
"Do not crop photos. Match Photo currently requires that the point you aimed the camera at is located in the center of the image (also called the center of projection). Although it may seem possible to use a cropped image, typically vertical lines will not align well across a cropped image and the results will be unsatisfactory."
This implies that cropped photos, those taken with a shift lens, or those adjusted in post will not work. I've found the same.
For a 2-point image taken with a shift lens (where the shift lens is effectively cropping the image before it hits the sensor) you need to 'un-crop' it - you can assume that if it is true 2-point then the horizon should be in the vertical centre of the image, so extend the crop of the image to align the horizon with the centre and you should be able to get things working.
You need to be very careful with adjustments to avoid skewing the vertical off. It helps a lot to 'nearly' match the view of the model before you open the image to be matched.
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I try photomatching archive images (dated 1890 or so) of rather large rooms (workshop) in a building. Of course, no idea what was the focal length and/or the parameters of the camera(s) used to take them back then and whether they have been cropped. The nice thing is that I have an architectural drawing of the building with accurate dimensions. I therefore built a 3D model of the rooms and try to match it with the available photos. I encounter several problems (usually that no matter how I carefully orient the model wrt photos with Photo Match), I always end up with scaling errors in at least one dimension.
Could it be related to the last post on the subject? As mentioned in the excerpt of SU Help cited in the last post, no cropping is allowed for Photo Match to work reliably. If my understanding of the last post is correct, the original image should be (vertically?) "un-cropped" so that the horizon passes through the vertical center of the (resulting un-cropped) photo. Is this a rule of thumb? And what about lateral un-cropping? Are the assumptions under which SU Photo Match works correctly described somewhere?
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