# Anaglyph 3D (Red/Cyan)

**URL:** <https://discourse.ioquake.org/t/anaglyph-3d-red-cyan/1972>\
**Category:** support\
**Created:** [July 15, 2024, 5:58am UTC](https://discourse.ioquake.org/t/anaglyph-3d-red-cyan/1972 "2024-07-15T05:58:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sen](https://avatars.discourse-cdn.com/v4/letter/s/cc9497/32.png) [@Sen](https://discourse.ioquake.org/u/Sen)\
**Post date:** [July 15, 2024, 5:58am UTC](https://discourse.ioquake.org/t/anaglyph-3d-red-cyan/1972/1 "2024-07-15T05:58:05Z")

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In the “improvements” page [here](https://ioquake3.org/improvements/), there is listed “Anaglyph stereo rendering (for viewing with 3D glasses)”. I wondered if anyone knows how to turn this on, if it’s maybe a cvar? I’m using Vorpx atm and it doesn’t like Quake III.

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<div class="post-metadata">

**Author:** ![zturtleman](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.ioquake.org/zturtleman/32/718_2.png) [@zturtleman](https://discourse.ioquake.org/u/zturtleman)\
**Post date:** [July 15, 2024, 7:07am UTC](https://discourse.ioquake.org/t/anaglyph-3d-red-cyan/1972/2 "2024-07-15T07:07:12Z")

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Yeah, it’s a cvar `r_anaglyphMode 1` for red-cyan. It may work better with `r_greyscale 1`. Note both of these do not currently work correctly in the default opengl2 renderer, so you would need to use `cl_renderer opengl1` as well.

You can open the in-game Quake 3 console by pressing shift+escape and paste the below commands and press enter to enable anaglyph stereo 3D.

```auto
cl_renderer opengl1; r_anaglyphMode 1; r_greyscale 1; vid_restart

```

You can switch back to the defaults with:

```auto
cl_renderer opengl2; r_anaglyphMode 0; r_greyscale 0; vid_restart

```

Quote from [ioq3 README.md](https://github.com/ioquake/ioq3/blob/main/README.md):

```preformatted
r_anaglyphMode

Enable rendering of anaglyph images
red-cyan glasses: 1
red-blue: 2
red-green: 3
green-magenta: 4
To swap the colors for left and right eye
just add 4 to the value for the wanted
color combination. For red-blue and
red-green you probably want to enable
r_greyscale

```

r\_greyscale is fractional. It’s possible to use r\_greyscale 0.5, etc to mix some color in.