Logo by Pauldelbrot - Contribute your own Logo!

END OF AN ERA, FRACTALFORUMS.COM IS CONTINUED ON FRACTALFORUMS.ORG

it was a great time but no longer maintainable by c.Kleinhuis contact him for any data retrieval,
thanks and see you perhaps in 10 years again

this forum will stay online for reference
News: Did you know ? you can use LaTex inside Postings on fractalforums.com!
 
*
Welcome, Guest. Please login or register. October 24, 2020, 11:54:58 AM


Login with username, password and session length


The All New FractalForums is now in Public Beta Testing! Visit FractalForums.org and check it out!


Pages: [1]   Go Down
  Print  
Share this topic on DiggShare this topic on FacebookShare this topic on GoogleShare this topic on RedditShare this topic on StumbleUponShare this topic on Twitter
Author Topic: Problem with stereo rendering: Common vs. Rectilinear lense (v189)  (Read 2026 times)
Description: Rectilinear lense should be used when stereo images or animation are rendered.
0 Members and 1 Guest are viewing this topic.
schizo
Iterator
*
Posts: 156



WWW
« on: January 11, 2014, 10:12:14 PM »

Hello Jesse and all stereo fractalist,

Jesse, my feature request:
Display a warning when the user wants to render a stereo image or video while using the "Common" lense type.

The details:
After calculation of my "Living Planet" stereo video was finished I noticed a problem:
Points that should match for left and right eye (the spikes) don't have the same vertical position. It is not that much, but still kills the 3D effect a bit.

See the following snapshot from the "Living Planet" animation:

It's the anaglyph of frame 275. I connected matching spikes from red to blue image. Usually this should always create horizontal lines. But because of the vertical shift the lines became boxes. The higher the box, the bigger is the vertical shift (the error).
As you can see the error is biggest in the edges and not present at the center / points on Y-axis.

I thought a bit about optical laws and decided that this is no bug but the normal result when two eyes were looking at a fixpoint.
When the fixpoint is infinity then the problem is nearly nonexisting because the rays reaching the eye are quite parallel. But near fixpoints create more and more crossed rays.
Crossed rays have the result, that the canvas / the image of the left eye and the one from the right eye are canted (rotated around Y-axis) to each other.

Another testrender proved this.

Here the right eye image:


Here the left eye image:


Green encircled are good comparable areas.
Blue lines are the length of compared points to the border, so their vertical position. Usually lines from corresponding point should have the same length. But they haven't.
Red arrows show the direction the left eye canvas is canted (rotated around Y-axis) to the right eye canvas.

Well, the canted canvases are the result of the optical laws when looking at a fixpoint. I think that our eyes have the same "problem", but we don't notice this, because the areas near the border of our field of view can not be seen sharp.

Points near the camera are more effected than points far away.
Near the left and right border we have the strongest effect/error.
The higher the FOVy the stronger the effect/error.

While playing and testing I also tried the camera lense setting "Rectilinear" and "Yeah" grin this solved the problem.
Even at a high test FOVy value of 150 the "Rectilinear" setting produce a perfect stereo image, even when such a FOVy is a bit too heavy for "Rectilinear" mode.

So boys and girls:
Use "Rectilinear" lense (for both eye images) when you plan a stereo video or image rendering!
 Please Read
Logged

Rathinagiri
Fractal Fertilizer
*****
Posts: 374


« Reply #1 on: July 08, 2016, 05:52:59 AM »

Wonderful explanation. Kudos!
Logged
Pages: [1]   Go Down
  Print  
 
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Mandelbulber 0.60 rendering problem Mandelbulber MarkJayBee 2 1520 Last post June 02, 2010, 09:55:53 PM
by MarkJayBee
Stereo image rendering - ? Mandelbulb 3d « 1 2 » Sfumato 18 4063 Last post September 27, 2011, 01:20:42 PM
by Sockratease
Animation Rendering Performance Problem Mandelbulb 3d Weber 7 1477 Last post April 14, 2012, 04:51:46 AM
by rahulmukerji
Problem with positional light at stereo rendering bug reporting schizo 0 769 Last post December 06, 2012, 08:25:12 PM
by schizo
Rendering problem with Mandelbulb 3D Mandelbulb 3d OceanTemporal 1 2616 Last post October 30, 2014, 07:33:21 AM
by OceanTemporal

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines

Valid XHTML 1.0! Valid CSS! Dilber MC Theme by HarzeM
Page created in 0.156 seconds with 29 queries. (Pretty URLs adds 0.013s, 2q)