4 ms·

> From each light source within a scene, rays of light are projected, bouncing around until they strike the camera. Which is definitely not how raytracing is d

> From each light source within a scene, rays of light are projected, bouncing around until they strike the camera. Which is definitely not how raytracing is done if you want to get an image before the end of the world occurs. Rays are traced from the camera, and then back to the light sources. Some amount of pre-lighting can be done by tracing photons forwards from lights, but not the main image generation.

bhouston 9y ago
In path tracing (https://en.wikipedia.org/wiki/Path_tracing https://en.wikipedia.org/wiki/Path_tracing), which is what the VFX industry uses primarily, both directions happen.
- oh_sigh 9y ago
  Does anyone use path tracing for live renderings? I think that is the question.
  - zero_iq 9y ago
    Brigade Engine, for example: https://home.otoy.com/render/brigade/ https://home.otoy.com/render/brigade/
    - abritinthebay 9y ago
      Is that even released yet? Or demo-able? I thought it was just "in progress" for ages?
      - OCASM 9y ago
        Today is the day: https://m.youtube.com/watch?v=6xE3J56pabk https://m.youtube.com/watch?v=6xE3J56pabk
        diggan 9y ago
        Has Octane 4 really been released? I see the demo video, but going to the website, everything is talking about Octane 3, not 4. Even the purchase page says "Octane 4": https://home.otoy.com/render/octane-render/purchase/ https://home.otoy.com/render/octane-render/purchase/
        OCASM 9y ago
        Well, here's the announcement on their forums: https://render.otoy.com/forum/viewtopic.php?f=7&t=66014 https://render.otoy.com/forum/viewtopic.php?f=7&t=66014 And in their facebook group: https://mbasic.facebook.com/groups/138694999640920?view=permalink&id=967114640132281 https://mbasic.facebook.com/groups/138694999640920?view=perm...
        AboutTheWhisles 9y ago
        "The Future of AI and GPU Rendering" I've used Octane and I think what they are best at is hype.
        Mithaldu 9y ago
        They're not even very good at that. The framerate of the VERY FIRST clip with the statue of liberty at the start of that video is horrendous.
  - psyc 9y ago
    People are definitely working toward it, at least.
  - WillKirkby 9y ago
    Demosceners are starting to, for sure. https://www.pouet.net/prod.php?which=69642 https://www.pouet.net/prod.php?which=69642
    - tzahola 9y ago
      Video version: https://youtu.be/9r8pxIogxZ0 https://youtu.be/9r8pxIogxZ0
      - ino 9y ago
        epilepsy warning The demo is amazing on its own as a piece of art, let alone it's done programatically, let alone it's rendered in real time, let alone it's just 4k.
  - pasta 9y ago
    There is a nice Quake 2 demo showing various settings: https://youtu.be/x19sIltR0qU https://youtu.be/x19sIltR0qU But I think we are still some time away from real time noiseless path tracing. Although more clever denoising filters for the first samples are getting much better. And ofcourse you can decide to use a very low number of bounces. This will give a darker inacurate result but still can give a feel of global illumonation.
  - avhon1 9y ago
    Blender's path tracing engine, Cycles, supports realtime use in the editing viewport. Unless your machine is quite powerful, however, it doesn't render anywhere close to 30fps. Instead, it iteratively updates the viewport. It is fast enough that this is tolerable and useful for many workload+workstation combinations.
smcl 9y ago
Looks like it was updated to the following which is closer: > Depending on the exact algorithm used, rays of light are projected either from each light source, or from each raster pixel; they bounce around the objects in the scnee[sic] until they strike (depending on direction) either the camera or a light source

bhouston 9y ago

In path tracing (https://en.wikipedia.org/wiki/Path_tracing https://en.wikipedia.org/wiki/Path_tracing), which is what the VFX industry uses primarily, both directions happen.

oh_sigh 9y ago
Does anyone use path tracing for live renderings? I think that is the question.
- zero_iq 9y ago
  Brigade Engine, for example: https://home.otoy.com/render/brigade/ https://home.otoy.com/render/brigade/
  - abritinthebay 9y ago
    Is that even released yet? Or demo-able? I thought it was just "in progress" for ages?
    - OCASM 9y ago
      Today is the day: https://m.youtube.com/watch?v=6xE3J56pabk https://m.youtube.com/watch?v=6xE3J56pabk
      - diggan 9y ago
        Has Octane 4 really been released? I see the demo video, but going to the website, everything is talking about Octane 3, not 4. Even the purchase page says "Octane 4": https://home.otoy.com/render/octane-render/purchase/ https://home.otoy.com/render/octane-render/purchase/
        OCASM 9y ago
        Well, here's the announcement on their forums: https://render.otoy.com/forum/viewtopic.php?f=7&t=66014 https://render.otoy.com/forum/viewtopic.php?f=7&t=66014 And in their facebook group: https://mbasic.facebook.com/groups/138694999640920?view=permalink&id=967114640132281 https://mbasic.facebook.com/groups/138694999640920?view=perm...
      - AboutTheWhisles 9y ago
        "The Future of AI and GPU Rendering" I've used Octane and I think what they are best at is hype.
        Mithaldu 9y ago
        They're not even very good at that. The framerate of the VERY FIRST clip with the statue of liberty at the start of that video is horrendous.
- psyc 9y ago
  People are definitely working toward it, at least.
- WillKirkby 9y ago
  Demosceners are starting to, for sure. https://www.pouet.net/prod.php?which=69642 https://www.pouet.net/prod.php?which=69642
  - tzahola 9y ago
    Video version: https://youtu.be/9r8pxIogxZ0 https://youtu.be/9r8pxIogxZ0
    - ino 9y ago
      epilepsy warning The demo is amazing on its own as a piece of art, let alone it's done programatically, let alone it's rendered in real time, let alone it's just 4k.
- pasta 9y ago
  There is a nice Quake 2 demo showing various settings: https://youtu.be/x19sIltR0qU https://youtu.be/x19sIltR0qU But I think we are still some time away from real time noiseless path tracing. Although more clever denoising filters for the first samples are getting much better. And ofcourse you can decide to use a very low number of bounces. This will give a darker inacurate result but still can give a feel of global illumonation.
- avhon1 9y ago
  Blender's path tracing engine, Cycles, supports realtime use in the editing viewport. Unless your machine is quite powerful, however, it doesn't render anywhere close to 30fps. Instead, it iteratively updates the viewport. It is fast enough that this is tolerable and useful for many workload+workstation combinations.

smcl 9y ago

Looks like it was updated to the following which is closer: > Depending on the exact algorithm used, rays of light are projected either from each light source, or from each raster pixel; they bounce around the objects in the scnee[sic] until they strike (depending on direction) either the camera or a light source