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Subject: matching a backdrop for perspective composition problem


reclaimer ( ) posted Sun, 15 June 2008 at 1:44 PM · edited Thu, 14 November 2024 at 4:54 AM

Attached Link: http://web.mac.com/mark.gardner/Site/Photos.html

 Hi im very new to 3D, im doing an experiment which involves rendering 3d object onto a 2d image. where am i going wrong try to match the plane, can someone help me? see attached file


sparrownightmare ( ) posted Sun, 15 June 2008 at 2:52 PM

I am not sure of what you mean.  Are you trying to replicate the 2D image in 3D? 


reclaimer ( ) posted Sun, 15 June 2008 at 3:01 PM · edited Sun, 15 June 2008 at 3:02 PM

Attached Link: http://www.youtube.com/watch?v=7UsgnU140tw

 no i am trying to put a 3d object into the scene, but i am having trouble matching the camera perspective. what is the way to go about this, if it were a movie syntheyes could plot it, but how do i do it on a 2d backdrop see this link http://www.youtube.com/watch?v=7UsgnU140tw

 thanks for helping
mark


sparrownightmare ( ) posted Sun, 15 June 2008 at 3:24 PM

To be honest, I have never tried to do this.  I would imagine that you first need to figure out the exact camera angle and location.  Next you will need to model the objects you want in the scene including any human figures.  I do not think there are any shortcuts for this.  As for the shadows. I would probably suggest creating a flat plane and putting part of the image on it to simulate the ground plane then put the top of the image on a plane in the background.  I would probably have the camera looking down at about a 20 degree andle to give it some depth.  Just a suggestion.  Like I said, I haven't ever tried to do this either.


GKDantas ( ) posted Sun, 15 June 2008 at 4:10 PM

Some photos can have a very strange angle or use a different zoom level. So if you dont have the values you will end in a try and error way. The best way is look to the horizon lines and match to your object, sometimes you will need to distorte your object to match the scene...

Follow me at euQfiz Digital




Xerxes0002 ( ) posted Sun, 15 June 2008 at 4:14 PM

Look at this thread. 

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3234001&ebot_calc_page

You might be able to ask mark a question, I still need to park a ship in my driveway but haven't gotten to it.  Perhaps after I finish the VTC videos :)


Sueposer ( ) posted Sun, 15 June 2008 at 5:15 PM

There is a product at Daz3D (ps_ac2442b) called Backdrop kit. This kit sort of does what you are looking for. You might or might not buy the kit, but look at the product information and see if it gives you an idea for setting up your scene.


Sueposer ( ) posted Sun, 15 June 2008 at 5:20 PM · edited Sun, 15 June 2008 at 5:23 PM

A very good carrara tutorial on this is at http://members.iinet.net.au/~njfinlay/


reclaimer ( ) posted Mon, 16 June 2008 at 2:14 AM

Thanks suposer but the link doesn't exist now!, i have had a sleepless night but i think i have to use the buildings in the background as my XYZ and create a separate working plane at an angle!


bwtr ( ) posted Mon, 16 June 2008 at 3:13 AM

file_408457.jpg

In Carrara 6 you now have "Splat"----Insert>Splat. You can put your item onto that and place accordingly against your background image.

bwtr


reclaimer ( ) posted Mon, 16 June 2008 at 3:36 AM · edited Mon, 16 June 2008 at 3:45 AM

 Thanks
im not sure what you mean, when i put the splat in i cannot see anything, now im lost as what to do?  will it get the perspective? im only trying to get a working plane that i can add 3d objects to, but the photo is distorted!


Xerxes0002 ( ) posted Mon, 16 June 2008 at 3:46 AM

I am intriged by the splat.

here is the URL that works, http://members.iinet.net.au/~njfinlay/Tutorials/CarraraTutorials.html  (its case sensative, if nothing else go back to the root http://members.iinet.net.au/~njfinlay/ and click on tutorials then on CarraraTutorials.html


reclaimer ( ) posted Mon, 16 June 2008 at 7:35 AM

Attached Link: http://web.mac.com/mark.gardner/Site/Photos.html

 thanks everyone

im shattered, I give up,2 whole days on this one!
There is too much lens distortion, i downloaded the demo of syntheyes to give it a whirl, but even that could not match the perspective of the buildings!

im going off to sleep and cry now, ive got a link to the actual image if anyone wants to have a go


reclaimer ( ) posted Mon, 16 June 2008 at 7:39 AM · edited Mon, 16 June 2008 at 7:40 AM

Attached Link: http://carrara3d.com/carrara_3d_3.html

> Quote - I am intriged by the splat. > > here is a link to some  carrara splat uses  Markus's web sites are an inspiration everyone should check em out, im new to carrara, but this guy makes it look easy and fun > > cheers


bwtr ( ) posted Mon, 16 June 2008 at 8:28 AM · edited Mon, 16 June 2008 at 8:29 AM

file_408467.jpg

A Rainbpw shader on a Splat (it shows up when the shader is applied) The background is a jpeg image The Splat can be sized and moved as required.

bwtr


bwtr ( ) posted Mon, 16 June 2008 at 8:33 AM

file_408468.jpg

Another scene

bwtr


bwtr ( ) posted Mon, 16 June 2008 at 8:44 AM

file_408469.jpg

A Tree on the Splat replacing the Rainbow.

bwtr


Sueposer ( ) posted Mon, 16 June 2008 at 9:41 AM

Thanks for pointing out this splat feature, BWTR. I'll be playing with it today. C6 really is cool, but I came in as a newbie to it and there is just so MUCH to learn!
One of my favorites is the difference between a background and a backdrop. It's in the manual, but when you first read it, it doesn't mean anything and is forgotten. After a few renders it makes sense and you wonder, "How could I have forgotten this?"


reclaimer ( ) posted Mon, 16 June 2008 at 9:47 AM

 does anybody know why some backdrops distort when bringing them in (they look squished sometimes)
cheers
mark


Sueposer ( ) posted Mon, 16 June 2008 at 1:29 PM

The aspect ratio (length to width) needs to be the same in both the texture map and the render output. The resolution does not need to be the same.


reclaimer ( ) posted Mon, 16 June 2008 at 4:15 PM

 thanks very much, i should have realised...Dohhhhh


bwtr ( ) posted Mon, 16 June 2008 at 8:19 PM

file_408495.jpg

Splats(billboards) generated on an (now invisible) Terrain using the Surface Replicator. Still just a simple jpeg background image. Brian

bwtr


reclaimer ( ) posted Tue, 17 June 2008 at 2:16 AM · edited Tue, 17 June 2008 at 2:18 AM

 thanks bwtr, and thanks for the files you sent, i can see me having some fun with this technique!

Mark

such a great community


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