OTOY Forums

cfrank78 wrote:T_3 you made the pictures. Thank you. But the "horizont" in your picture is straight. The original pictures in post 5 are not straight, at least the horizont. Have a look. I made my pictures exactly like the horizont was. I placed the camera so that the horizont and the object itself were like on the picture. The 3 pictures were made with a full frame camera 24x36mm.

there is one thing to note about the horizon: the wall/floor edge is obviously _not_ leaning to the left side because the camera was rotated along its z axis (at least not much), but because the camera was not facing the wall in a 90° angle. this is pretty visible on the bottom of the foreground bottle - which is straight - and even more on the vertical line of the power outlet in the wall (on the left side) which is also straight.

since the photos gave no clear picture about the original rotation and direction of the camera, the angle of this edge is just misleading (and i did actually add a -0.5° roll); also, in the rebuilt geometry, this edge is not right behind the blue bottle like in the photos. so if - like in your own tests - you actually rotate the camera to mimic the angle of this line, this will of course lead to additional wrong impressions about the perspective.

my bottom line is, you should be able to recreate photos shooted with focal lenghts of ~35mm and up, but you need indeed to recreate the geometry and especially the camera position like it was in the original. take this not as critisism - you said the bottles example was just a quick test, but if it is not made accurate, it just gives misleading results...

hi Chris,
i'm a cinema 4d user and with previous versions i used this plugin:
http://www.vonkoenigsmarck.de/blog/?cat=5
now i'm using cinema 4d r14 that has a built in solution for camera matching that works great.
you must find one for your host application
ciao beppe

I am Rhino user and i am learning C4D at the moment. Is there anywhere a tutorial where i can see how that photo match tool works in C4D R14? Youtoube or anywhere else?
I have no problem to export my scene to C4d and work there!


Thank you for your help Beppe!

Who can tell me if and how its possible to place a background image like i asked before?

Chris!

cfrank78 wrote:Hi Everybody!

If i wanna make a impressive shot of my jewelry i know i have to take 60mm or 85mm, take an iso of about 400 and a macro glass with a aperture of about 13 for a good depth of field. Position the camera, put some lights, klick and voila, great shot. It is very fine to play with DOF without affecting exposure BUT what we mean is, that the numbers - the values are so strange. Exposure 1/100 should give the results that in the real world 1/100 would give. the NUMBERS are so confusing. fstop ....give us aperture values. F1,4 - F2 - F2,8 - F4 - F5,6 and so on!

I want a wide angle on a Full Frame. Give us focal length like 14mm, 18mm, 24mm, 35mm, 50mm, and so on. We can read that . We all learned that. Thats our business

Your user group are people that are used to those numbers. This is our business.

If i were a professional race car driver and i am used to km/h or miles / h - would you wanna give me my tachometer in mm/sec? You know now what i mean?

You have 3 sliders that do the same thing and only ONE of the is working like in real world. I hope i made my problem clear now and you guys understand me better!

Have a nice day everybody - Chris!

I think Chris worded this perfectly, much better than I tried to do. These camera controls are practically a standard in the big 3 software packages that Octane interfaces with, and then to export to Octane to final render and not have them setup correctly is not only frustrating but time consuming for those of us on tight deadlines. I know you guys have set things up the way you did for a reason, but from a practicality standpoint wouldn't it be easier to follow the standard? I know I'd rather have a 3D guy who also knew what the real-world camera equivalent of his 3d settings would be as that comes in pretty handy on video shoots that you are matching CGI to.

roeland wrote:
The formula for the horizontal field of view angle is 2 * atan(sensor width / 2 / focal length))
For a 35 mm camera this yields
18mm → 90°
34mm → 55°
55mm → 36°
85mm → 24°

But there are various other camera formats out there. For a four thirds camera (sensor width is 17.3mm)
18mm → 51°

So a focal length slider isn't that straightforward.

The fact that changing the depth of field also changes the exposure is a limitation of how cameras work, I don't think it will be convenient if we emulate this in Octane.

--
Roeland

What about a focal length slider that's linked to a camera format dropdown for those formats that are most used? Plus a custom format in that drop-down to set your own in very specific cases? This is the way Cinema 4D handles this situation and I have to say it works very well.

cfrank78 wrote:I am Rhino user and i am learning C4D at the moment. Is there anywhere a tutorial where i can see how that photo match tool works in C4D R14? Youtoube or anywhere else?
I have no problem to export my scene to C4d and work there!


Thank you for your help Beppe!

Who can tell me if and how its possible to place a background image like i asked before?

Chris!

of course:
http://m.youtube.com/watch?v=W5oC5hcXDW4
http://m.youtube.com/watch?v=lQKNh1h32xk
http://m.youtube.com/watch?feature=rela ... 3XsZs5ZNqs
about the image background, this is not currently possible in octane but again create a plane with the same proportion of the photo and mapped with it, place the plane as a child of the camera and move it along the z azis until is perfectly matched with the shot in your host app.
ciao beppe

Hi Everybody!

Sorry for my late reply. Was very busy

Beppe thank you so much. This saved me hours and hoers. This is simply fantastic in C4D. I wish i had something for Rhino itself. I try to find now a way to export the whole setup from c4d to octane standalone. Camera, Angle, Perspective, Material..... I dont know how the exporter works. Can anybody help me find a tutorial where i can export the c4d szene with the exporter and where i just apply materials and done? is that even possible? this would be sooooooo great

Thanks for all your help, especially Beppe!

Kind regards Chris!