Photomatching Issue

thomthom · 8 Jul 2011, 12:41

I would pay good money for a photomatching tool in Sketchup which is similar to that of 3ds max, Bonzai3d etc - pick points in model - then on the background photo - have it calculated. None of this fiddling with handles nonsense.

honoluludesktop · 9 Jul 2011, 00:02

Tom, Is this a plugin idea?-)

thomthom · 9 Jul 2011, 09:12

Not something I have the capabilities of doing. Beyond me.

SallyTessio · 2 Aug 2011, 12:16

I'm not sure if this is a solution to the problem you are talking about here but I've solved my scaling problem during photo match renders by changing the Zoom Factor (Vray Options -> Camera -> Zoom Factor). In my scene 0.4 was the correct factor to get the desired view.

Roger · 2 Aug 2011, 16:49

If the problem is with 2 point perspective, render the project in 3D. Then import the image into PhotoShop and do your 3pt to 2pt perspective there. Focal length and FOV are not the critical factors. What you have to worry about is having the virtual camera at the same distance, angle, and height as the physical camera. If these are identical then building and background will match.

Also the design of point and shoots is optimized around manufacturing and small form factor. The optical center of the lens may be fudged a bit to make room for a battery, circuit board or lens motor.

valerostudio · 2 Aug 2011, 19:58

It's all about the photo you are matching. Sometimes I have very little issue putting my rendering into a photo using photomatch and sometimes it does not work at all because the way SketchUp takes those match lines and creates the scene tab camera view. Sometimes its so distorted that when you just hit zoom ever so slightly (the trick to getting Vray to render the match) it zooms way out and the perspective vanishing points are reset. It's just one of those things you need to tread carefully around I guess.

broomstick · 2 Aug 2011, 22:55

@valerostudio said:

Sometimes its so distorted that when you just hit zoom ever so slightly (the trick to getting Vray to render the match) it zooms way out and the perspective vanishing points are reset. It's just one of those things you need to tread carefully around I guess.

I can relate to that.. in my last job I was photomatching some presumably cropped photos of a model where we had to insert our 3D. One of these views was so distorted, as soon as did an orbit the entire view would rotate along the camera-target axis rendering that view useless...

I had to manually adjust the perspective in sketchup that time, no amount of photomatching would help me...

vidy · 3 Aug 2011, 06:44

Check this out guys: http://www.youtube.com/watch?v=MK7HAgONdaU&hd=1
maybe its not as perfect as the photomatch feature, but this one is much easier and hope it could help...

regards,

Roger · 3 Aug 2011, 08:47

@valerostudio said:

It's all about the photo you are matching. Sometimes I have very little issue putting my rendering into a photo using photomatch and sometimes it does not work at all because the way SketchUp takes those match lines and creates the scene tab camera view. Sometimes its so distorted that when you just hit zoom ever so slightly (the trick to getting Vray to render the match) it zooms way out and the perspective vanishing points are reset. It's just one of those things you need to tread carefully around I guess.

Upon reading your post more carefully, perhaps I understand the problem a little better. You say, "putting my rendering into a photo."

Photomatch is designed to allow you to model an existing scene from a photograph." Now if you design a building from scratch you can not drop that building into a photo without matching the point of origin and the vanishing points that would exist if the building were already in the photo.

To do this without a lot of painful trial and error you will need to know exactly where you expect the front corner of your building to touch the ground in the photo. You need to know the precise distance that point was from the optical center of your lens at the time you took the picture. You also need to know how high that optical center was when the photo was taken.

This can be done very reliably. The question is how much prep work on site are you willing to do at the time of the site photograph? Would you like me to step you through the process and make it into a tutorial for everyone else?

aclark · 22 May 2015, 20:28

Has anyone had any success in figuring out how to fix this issue with VRAY and SU 2015? I have used photo match to setup multiple camera views.