PureBasic Forums - English

Hi everyone,

Here's an anaglyph compositor I've made some time ago but forgot to post here (sorry).

How does it work:
Two cameras, slightly apart and linked to a node, view the scene from two slightly different angles. The tricky part was to overlay the left view (red) and the right view (cyan).

- The "right" camera is used in a "CreateRenderTexture";
- This texture is named, so it can be passed in an Ogre script;
- The "left" camera uses a compositor, which render the scene and call a material to display it on screen;
- This material has two texture units: the one created by the compositor, and the named render-texture;
- These two texture are then passed to a shader, which converts them to greyscale and mix the red chanel from the left image and then green/blue channels from the right image;
- And the compositor displays the result fullscreen.

Maybe not the best method, but it works .

Here a zip with the source and the needed resources (textures, script, etc..)
http://keleb.free.fr/codecorner/downloa ... hCompo.zip

Have fun!

Very nice example!

CreateRenderTexture with shaders can be a very powerful combination.

I'll have to start experimenting more with them.

i don't have 3D glasses red/blue but i have positioned 2 red and greenish transparent plastic in front of my eyes and your cube looks like a true 3D object. i thought of something like that before but can't do it.
thank you

Great! If it´s possible to integrate it easily, I will use it in my Project

Does not work with PB5.30b7..

dige wrote:Does not work with PB5.30b7..

Code: Select all

12:59:25: *-*-* OGRE Initialising
12:59:25: *-*-* Version 1.8.2 (Byatis)
12:59:25: OGRE EXCEPTION(7:InternalErrorException): CG dll can't be loaded in CgPlugin::install at OgreCgPlugin.cpp (line 195)
12:59:25: *-*-* OGRE Shutdown

Hey dige.

Grab these dlls. They are a must for it to work. Unpack and place them at
the same location as the code.
Link removed - obsolete

Btw: nice example Kelebrindae.

@Dige:
You need Nvidias CG-toolkit (dll).

@DK_PETER: Thanks, but unfortunately still does not work.

Windows 7 x86 says:

try the Cg installer here https://developer.nvidia.com/cg-toolkit-download
this is from the help http://www.purebasic.com/documentation/ ... ine3d.html

It works! Very nice. But why, it cannot run with ogre only?

dige wrote:It works! Very nice. But why, it cannot run with ogre only?

Nvidia CG is a third party product: hence the need for the extra dlls.

dige wrote:It works! Very nice. But why, it cannot run with ogre only?

As DK_PETER said it's because the shader is in CG (Nvidia's shader language). If you want to get away from the DLL you can convert the CG shader to HLSL (windows only).
Since HLSL is pretty much identical to CG it should only take a few minutes to convert.

@Samuel: that would be great, if you could convert it to "ogre only". Unfortunately I have no idea of shader programming...
Someone in the forum had created a great view into an cathedral OGRE. I'll look and hope to finde the source again and would like to implement in stereo.

Edit: http://www.purebasic.fr/english/viewtop ... 36&t=57871

Here's the HLSL version with Kelebrindae's example code.

anaglyphHLSL.zip

This version will only work on windows, but the cg.DLL will no longer be required.
Let me know if something doesn't look right.

this is certainly useful addition Samuel, someday i may learn some HLSL, but is it depends on specific DirectX 9 or works with any version ?