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Boole object animated intersection edge

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particle boole edge emitter
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  • E
    education-common last edited by Dr. Sassi Sep 28, 2023, 4:45 AM Sep 9, 2023, 3:38 PM

    Boole object, A without B, A and B are 2 spheres, B is animated and intersects with A.
    As a result I get A with a moving hole in it (in the shape of the intersection).
    I want to use the intersection edge of this animation.
    If I was to use a single frame, I could just tick "select intersections" and press C to merge all and I would have a selection of the intersection edge. How do I do this for the animation, inother words how can I get an animated intersection edge? (I will use this animated edge to emit particles)
    Thanks

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    • Dr. Sassi
      Dr. Sassi last edited by Dr. Sassi Sep 13, 2023, 9:15 PM Sep 10, 2023, 7:15 PM

      Hi education-common,

      That animated edge is new in each frame, which means no motion blur or continuous data. So, I will discuss some options below.

      There are options, perhaps to use the Curvature Node, but I didn't get a prominent clean line there. Perhaps bake an Ambient Occlusion (inverted), and use it with PMatterwave.

      I checked to get an XPresso set up, whereby a Spline circle (as an Emitter) would sit between the two spheres, and the ratio in the distance is also based on the ratio in radius, while the calculation needs to be split into sphere B is outside or inside Sphere A. After a while, I thought that was a lot of math and how to communicate about it. So, I looked for something simpler. Here is an incomplete but working setup:
      https://stcineversityprod02.blob.core.windows.net/$web/Cineversity_Forum_Support/2023_Clips_DRS/20230910_Circle-intersection.mp4

      Here is the simple yet cleanest result that I found so far. … 01.c4d (in the link below)

      Below is a little idea to have just the ring, and emit from it. Since the spheres are cutting into each other, changing the surface angle, the ring changes its width accordingly. But I assume you like to have it stable. … 00.c4d (in the link below)

      This would lead to this option, not a bool, but a sphere with a round adjustable hole and a ring around. … 11.c4d (in the link below)

      Files
      https://stcineversityprod02.blob.core.windows.net/$web/Cineversity_Forum_Support/2023_PROJECTS_DRS/20230910_CV4_2023_drs_23_ANsr_00-01-11.zip

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      All the best

      Dr. Sassi Sassmannshausen Ph.D.
      Senior Trainer, Maxon Master Trainer, L&D - Strategist
      Cinema 4D mentor since 2004, Member of VES, DCS.

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      • E
        entry-newspaper last edited by Sep 11, 2023, 4:14 PM

        Not sure what plug you intend to use, to generate the particles. But couldn't you drive that emission, with a luminance-based texture? If you apply a pure white material, to the boolean "B" object, and have it subtract from "A". Something like XP would allow you to drive the emission, with a material, so if you simply made everything else luma-black, then maybe that would work?

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        • Dr. Sassi
          Dr. Sassi last edited by Dr. Sassi Sep 11, 2023, 5:18 PM Sep 11, 2023, 5:12 PM

          Thank you, entry-newspaper,

          Your post showed me that I must make it more transparent, for example how to use the ring project file. Here is the Ring version from a Boole with Thinking Particles. (I left particles so far out as particles can mean a lot, standard, Thinking Particles, X-Particles, etc.

          CV4_2023_drs_23_ANsr_21.c4d

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          All the best

          Dr. Sassi Sassmannshausen Ph.D.
          Senior Trainer, Maxon Master Trainer, L&D - Strategist
          Cinema 4D mentor since 2004, Member of VES, DCS.

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          • E
            education-common last edited by Sep 12, 2023, 11:23 AM

            super, thank you

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            • Dr. Sassi
              Dr. Sassi last edited by Sep 12, 2023, 3:37 PM

              You're very welcome, education-common!

              My best wishes for your project.

              Dr. Sassi Sassmannshausen Ph.D.
              Senior Trainer, Maxon Master Trainer, L&D - Strategist
              Cinema 4D mentor since 2004, Member of VES, DCS.

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