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Author Topic: Scene gemometry--> Camera Perspective Deformation???  (Read 6894 times)

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xerilon

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Scene gemometry--> Camera Perspective Deformation???
« on: June 19, 2005, 04:13:27 PM »
Hi all!  I have a problem using 3d geometry exported as *.3ds from Cinema4D! 
Walking planes and objects etc. seem to be there, but the perspective doesn`t match the background image i WME. I think the camera seems a little tilted too...

Any suggestion on the subject?  Has it anything to do with the focal lengths and such?
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Nihil

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #1 on: June 19, 2005, 04:39:05 PM »
According to the help-file there was a problem with cameras exported from C4d, so you have to set the FOV manually in Scene Edit (I guess you just have to type in the same values the cam has in C4d?)
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xerilon

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #2 on: June 19, 2005, 05:53:23 PM »
I have already tried setting it manually, but even if I override with the same FoV as in Cinema4d, it doesn`t match...

In Cinema4d the "Aperture width" and "Focal length" is individually adjustable on the cameras.  Is there a default or adjustable value to this in WME?
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Nihil

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #3 on: June 19, 2005, 07:06:21 PM »
Hmm, don't know, and I don't have C4d to test it. But I had a similar problem with a Blender-scene where I used a rather unusual camera lense (22 I think), while for example 35 worked. Does the error occur with all you scenes or just one?
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xerilon

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #4 on: June 19, 2005, 11:36:23 PM »
Yes it occurs in all scenes with more or less deformation...
My c4d camera properties areas follows:

focal length : 50
aperture width: 36
field of view: 39,598 deg

In WME scene edit I override the cameras fov to the nearest value (39 deg), but it looks weird anyway.. Does Mnemonic know anything on this?
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Mnemonic

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #5 on: June 20, 2005, 07:30:48 AM »
Quote from: xerilon on June 19, 2005, 11:36:23 PM
In WME scene edit I override the cameras fov to the nearest value (39 deg), but it looks weird anyway.. Does Mnemonic know anything on this?
It has been reported before that Cinema 4D exports wrong camera FOV to the 3ds file; that's actually the #1 reason why the "Override FOV" option has been added to SceneEdit. I thought it was enough, because the exported 3ds file contains the FOV information *only* (focal length gets converted to FOV when exporting). Could you please post a screenshot of how weird does it look when you match the geometry with the rendered image in SceneEdit?
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xerilon

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #6 on: June 20, 2005, 10:50:12 PM »
Have the forum been down today? Or is it just me... 
I have made 2 test scenes of my work today:
#1   
The camera properties in C4d on the first test:
http://home.no.net/xerilon/screen1c4d.jpg

A screenshot from the scene editor: The cameras looks a little tilted Im sure...
http://home.no.net/xerilon/test1wme.jpg

#2
Camera properties from the second test:
http://home.no.net/xerilon/screen2c4d.jpg 

Second screenshot from scene edit: This time it is almost perfect (almost) although the fov value does not match the value from c4d..
http://home.no.net/xerilon/test2wme.jpg

I believe I can stick with the camera values from the second test, but do I have to manually override each camera on each scene?
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Jerrot

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #7 on: June 21, 2005, 01:57:02 AM »
Hi xerilon,

one question about the first scene - does ANY value adjustable with WME's override function work for it?

In the second case it looks to me, as if WME and C4D describe the FOVs differently. Some programs use the vertical FOV, some the horizontal. I won't bore you how to calculate it, but in the second case the difference might almost fit.
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Mnemonic

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #8 on: June 21, 2005, 06:55:53 AM »
xerilon, would you mind sending me the 3ds file and the background image for the first test? I'll try something. The camera tilt is indeed wrong for some reason...

And, yes, the forum was down yesterday, my host was upgrading PHP and something went wrong :)
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xerilon

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #9 on: June 21, 2005, 09:41:01 AM »
Hi Jerrot! None of the override values worked. The picture shows the closest I could get  :-\


Mnemonic, I have posted the files you requested here :
http://home.no.net/xerilon/1.jpg
http://home.no.net/xerilon/1.3ds


I am very grateful for this serious support  :) I may only have overlooked something
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Mnemonic

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #10 on: June 21, 2005, 09:11:15 PM »
Well I tried disabling camera bank and the first scene looks much better then (not exact, but at least it's not tilted anymore), but the bank IS stored in the 3ds file. I'm confused ???
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xerilon

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #11 on: June 22, 2005, 03:59:40 PM »
Yes Im confused too! The bank is not to be noticed in Cinema 4d,, must be some error in the export procedure...

Anyway,, thanks for all help and advice! I will remake the scene using the camera values from the second test and just go for that 8)
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Lomeg

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Re: Scene gemometry--> Camera Perspective Deformation???
« Reply #12 on: October 06, 2008, 10:12:21 AM »
I had this Problem too...
Go to the EDIT Tab in your Scene Preview in C4D and mark "Use as Render View"
and Render your Scene and export the Image.
Than it should work.

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