WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 06-09-2017, 08:31 AM
Geoffrey Megard Geoffrey Megard is offline
Member
 
Join Date: Jun 2017
Posts: 2
Projecting two cameras on one viewport and alternative solutions

Hello,

I would like to make something similar to this in Vizard:
https://vimeo.com/23607848

Here are the solutions that I thought of and did not succeed to implement with Vizard:

Solution 1:
I wanted to create
- an orthographic camera which is fixed and looks at the array of disks (and the disks only render to that camera)
- a perspective camera which navigates in a 3d scene (and that 3d scene would only render to that camera)
- a window/viewport that shows what both cameras render (with the orthographic camera layer on top)

That is basically the set up I was using when using openGL to program video games where I had to render a GUI on top of a 3D scene.

Unfortunately, I did not find how to make two camera projecting to the same viewport/window in Vizard.


Solution 2:
I tried to render the camera 1 on a plane and then attach the plane to camera 2.
However, doing that the plane is opaque where there is no disks [i.e. it renders the background color], so that we don't see through it.
Thus to make this solution works I would need the background color to be transparent.

Solution 3:
I tried to use only one perspective camera and attached the group of disks to it, but I don't find an easy way for the disk to always face and stay in front of the camera.

I tried to the functions:
<node3d>.link(): then the disks follows the change in position of the camera but they don' t stay in front of the camera if it rotates.
<node3d>.billboard(): then the disks follows the change in rotation of the camera but they don' t follow the change in position, and they won' t stay in front of the camera when it roatates.
<node3d>.setParent(viz.ORTHO): everything is ok after I changed the size of the disks into pixels, except that the non-flickering disks become white while the flickering disk does not follow the good color sequence.
<node3d>.setParent(viz.MainView): I just don't see where are the disks, they seems to be invisible. I tried to place them at every position axis around the camera (e.g. setPosition([1, 0, 0]), setPosition([-1, 0, 0]), and I just cannot see them.

Do you think there is an easy solution to my problem?

I attached the code that I am using to set this up. The main file is:
playgrounds/playground_attached.py

Thank you very much for your help,

--
Geoffrey Megardon
Attached Files
File Type: zip tovizardforum.zip (7.6 KB, 137 views)
Reply With Quote
Reply

Tags
camera, orthographic, overlay, parent, visor

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 06:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright 2002-2018 WorldViz LLC