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Q: Is there a way to tell which wall you're drawing on?

I am used to CAVELib capabilities. Is there a way to tell which wall you're drawing on?

A: You will know what wall you're drawing on by the position of your geometry.

You will know what wall you're drawing on by the position of your geometry. This way, you won't have to do any thing weird or morally wrong, like draw 2D in a 3D VR environment. Personally though, I wouldn't ever draw just on one wall, since technically the user isn't supposed to know the walls are there (that's what we call immersion). It could ruin the effect for them. I'd just put it up somewhere convenient in 3D space (if that happens to be the wall, then I wouldn't let that stop me. The depth buffer trick (described in the 2D projections question) will ensure that you'll always see it, but be careful since it can really confuse your users if something gets positioned in front of your heads-up display.

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