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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 26 Apr 2019
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      The evilest of VR performance hacks: create a camera that encompasses FOV of both eyes (do some trig to figure it out), render from that view, and then reproject to both eyes. (Only works with objects that are flat quads, I think.)pic.twitter.com/jouFp2EYDj

      1 reply 0 retweets 7 likes
    2. Michael S‏ @mschuresko 26 Apr 2019
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      Replying to @mistahzip @pcwalton

      Yes, but we had colocated cameras and non-coplanar screens. So we didn't have the "only works for coplanar images" restriction.

      1 reply 0 retweets 1 like
    3. Michael S‏ @mschuresko 26 Apr 2019
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      Replying to @mschuresko @mistahzip @pcwalton

      A more flexible VR hack might be to use both the rendered depth buffer and the color buffer along with something like https://www.cs.cmu.edu/~ph/869/src/asst2/asst2.html … in the per-eye fragment shader for re-rendering the image.

      2 replies 0 retweets 0 likes
    4. Patrick Walton‏ @pcwalton 26 Apr 2019
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      Replying to @mschuresko @mistahzip

      Yeah, I was thinking about something like that. Doesn’t matter for my use case though since Pathfinder only renders 2D vector art (though it transforms it into 3D).

      1 reply 0 retweets 2 likes
    5. Michael S‏ @mschuresko 26 Apr 2019
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      Replying to @pcwalton @mistahzip

      Also if you're rendering complex paths on a flat quad, and the flat quad is embedded in 3d, you can just render your flat quad in full screen orthographic or whatever and then draw a quad textured with the resulting color buffer at the right place in 3d for the 3d pass.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 26 Apr 2019
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      Replying to @mschuresko @mistahzip

      That’s the obvious solution, but it results in a big quality loss at oblique angles because there’s no good resolution to render at. (This is kind of *the* problem of text in VR that Pathfinder solves.)

      6:27 PM - 26 Apr 2019
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      • mistah zip Valentin Goșu 🇷🇴🤓🦖🦊 Michael S
      0 replies 0 retweets 3 likes

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