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Regarding Nodevember livestream with simon thommes, ray marching procedural material

Forum Archive › Regarding Nodevember livestream with simon thommes, ray marching procedural material

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  • February 27, 2020 at 3:24 pm #11412
    nosfero32
    Participant

      Hey everyone, I have been trying to recreate the ray marching method from near the end of the nodevember live stream https://www.youtube.com/watch?v=3UWHKtKsIbU .

      Does anyone know how the SDF nodes are implemented? 

      February 28, 2020 at 1:39 am #53318
      spikeyxxx
      Participant

        Hi nosfero32,

        know what you’re getting yourself into!

        Here’s a simple example of an SDF of a line segment:

        With Raymarching  this could give for instance this (here the Raymarching stops at a certain, constant distance from the line):

        You might wanna watch this video (to start with):

        https://www.youtube.com/watch?time_continue=4&v=62-pRVZuS5c&feature=emb_logo

        I haven’t found any Blender Raymarching videos, but the technique is used ‘a lot’ in games. If you Google SDF and Raymarching you’ll find a ton of resources, but you’ll have to ‘translate’ them to Blender.

        It’s not an easy topic! Have fun and good luck.

        February 28, 2020 at 7:29 pm #53319
        nosfero32
        Participant

          Thank you so much for this Spikeyxxx. I really appreciate the information, this is exactly what I was looking for to get started. Looks like I will need to build up a library of primitive SDF shapes which can be used along with union and intersection operations to create more complex shapes. Wish I could remember more vector calculus, all that parametric surface and vector math would be useful but its been awhile. 

          I found the following resources so far https://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm 

          https://www.alanzucconi.com/2016/07/01/signed-distance-functions/ 

          If you have any more examples or particularly good resources I would really appreciate that as well!

          It looks like this could get pretty computationally intensive, are there any tricks for improving efficiency I should be aware of?

          Thanks again Spikeyxxx.

          February 29, 2020 at 1:07 am #53320
          spikeyxxx
          Participant

            Hi nosferu, Inigo Quilez is indeed a great resource. (The best I could find, but I’m sure there are more out there…)

            I’m not sure about this being computationally intensive; it’s mostly just Math Nodes, which computers can handle in sleep;)

            If you can get boolean operations to work, together with the primitives, you can basically build anything. I’m still working on that;)

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