Print Page - Turning the camera without parallax

Title: Turning the camera without parallax
Post by: barcud on April 25, 2012, 05:11:15 PM

Hello,
I have been playing with Mandelbub for a while but there is one thing I can't figure out.

I would like to create an image for an interactive panorama. To do this I wanted to create a few images from the same point, rotate the camera and stitch them together.
The problem is, that moving around creates parallax shifts of foreground and background so the stitching doesn't really work.

Is there any way to rotate around the non parallax point (nodal point for a camera)?

I tried different setting in the FOV and zoom setting to minimize the shift but I guess the program was written to show that shift to make it a better 3D experience.
Tried the shift buttons in the main window as well as the navigator.

And I guess I do not really understanf the FOVy; I can set that to 360, which might not make a lot of sense but I somehow expected the top and the bottom to match up, but it doesn't.
How do I need to understand the FOV?

Cheers and thanks in advance,
Barcud

Title: Re: Turning the camera without parallax
Post by: Jesse on April 26, 2012, 10:52:36 PM

This is not possible in mandelbulb3d, to complicated to explain why ;-)

Please use Mandelbulber or Fragmentarium or everything else available for this purpose...

Title: Re: Turning the camera without parallax
Post by: barcud on April 27, 2012, 11:22:02 AM

Thank you,

after playing around I thought so - so thanks for the confirmation.
Sad though - I am getting on a lot better with this navigator.

Does anybody know if there are plans to include e.g. equirectangular projection??
That would open the door to possible 360 degrees videos where you can fly through a fractal (as you can do now) BUT you could also have a look around.
There is quite a bit of discussions about 360 videos going on in the panorama photography sections and some panorama galleries are thinking about how to showcase those videos.

I just saying that this might open up not just a new can of worms but also a potential new user market.

Cheers,
Barcud

Title: Re: Turning the camera without parallax
Post by: KRAFTWERK on April 27, 2012, 03:07:28 PM

Well, it should be possible to use a big FOV and do a Big Render of that image...
That way you'll get many images which stitches perfectly to each other...

Title: Re: Turning the camera without parallax
Post by: barcud on April 27, 2012, 03:34:54 PM

But that big render would still just be a part of an image, not a 360 'sphere' where I am in the middle and can look around.
I tried really big FOV but I could not find points to connect the top and bottoms. Horizontally I think I could find a point where it reapeats itself but I could not find that in the vertical world.

I won't give upyet and play around a bit more.

Cheers,
Barcud

Title: Re: Turning the camera without parallax
Post by: Syntopia on April 28, 2012, 10:30:15 AM

Hi,

It is possible to do the equirectangular projection in Fragmentarium (I've recently been playing around with environment maps), but doing so will require some programming - and doing animation is very difficult at the moment :-)

However, if anyone wants to try the code for equirectangular mapping is simple:

Code:

// Given an orthonormal camera frame: 'dir', 'up', and 'right'
// and a point, coord, in screen coordinates from (-1,-1) to (1,1),
// this function return the required ray tracer direction.
vec3 equiRectangularDirection(vec2 coord, vec3 dir, vec3 up, vec3 right) 
{
	vec2 r = vec2(coord.x,(1.0-coord.y)*0.5)*PI;
	return cos(r.x)*sin(r.y)*dir+sin(r.x)*sin(r.y)*right+cos(r.y)*up;
}

Here is an example picture:
(http://hvidtfeldts.net/WebGL/z2.jpg)
(Hires: http://hvidtfeldts.net/WebGL/z.jpg)

If you have a WebGL capable browser, you can view the panorama image in this three.js viewer:
http://hvidtfeldts.net/WebGL/panorama.html

(There is no anti-alias for equirectangular projections yet, so the image quality is not very good)

Btw, if you do these kind of images, the specular lighting will be wrong, since it depends on the camera direction.

Title: Re: Turning the camera without parallax
Post by: Jesse on April 29, 2012, 11:33:45 PM

Quote from: barcud on April 27, 2012, 03:34:54 PM

I won't give upyet and play around a bit more.

You can multiply the zoom value by 100 or even higher (to minimize the camera starting plane) and set Zstart to Zmid to imitate a camera at the Mid values.

Title: Re: Turning the camera without parallax
Post by: barcud on May 07, 2012, 07:43:03 PM

Quote

You can multiply the zoom value by 100 or even higher (to minimize the camera starting plane) and set Zstart to Zmid to imitate a camera at the Mid values.

Tried it but I am not sure how that should work.
Say I found an area which I really like and I would like to take a 360 panorama there when I change the zoom value it will take me out of there to the new zoomed position. I troed to et Zmid and Zstart and turn or zoom out again and turn but I will get the perspective changes whenever I turn or slide.

Haven't found a solution yet (other than to use Mandelbulber but I am struggling there with the navigation to find interesting areas) but I guess i will hang in there and try some more.

Cheers everybody.

Title: Re: Turning the camera without parallax
Post by: Jesse on May 08, 2012, 12:49:40 PM

Pano option will be in the next update, won't bother about it.

Title: Re: Turning the camera without parallax
Post by: barcud on May 09, 2012, 04:20:12 PM

Now that sounds really promissing!!!!
Can't wait for it!!

Cheers

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Fractal Software => Mandelbulb 3d => Topic started by: barcud on April 25, 2012, 05:11:15 PM