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Forums Maxon Cinema 4D Mo target rotation during dynamic physics simulation?

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  • Mo target rotation during dynamic physics simulation?

     Jim Scott updated 4 days, 18 hours ago 2 Members · 11 Posts
  • Devon Dowler

    April 3, 2021 at 6:39 pm

    Basically I have these eyeballs and I need them to target a specific object, however they are in a 0g simulation, I tried using a mo target and it works great but once the simulation starts it stops moving.

    In the dynamics tag there is an option under Force “Follow Rotation” and it does almost exactly what I need, but instead of keeping a fixed rotation I need it to target an object, any ideas?

    Ive been working on this problem for days and Im really stuck, any help would be great!

  • Jim Scott

    April 4, 2021 at 6:50 pm

    I’m not sure what you mean by “once the simulation starts it stops moving.” The eyes stop moving, or the target stops moving, or…. what? Which object(s) are you referring to? I don’t think you need to use “Follow Rotation,” but I’m having a hard time picturing exactly what you are trying to do. Could you post your project file so we could see what you have so far?

    I made a simple project to see if it is anything like what you are trying to do. Let me know if this helps:

  • Devon Dowler

    April 6, 2021 at 6:22 pm

    Yea for sure, sorry if this was confusing, I attached the file and I will try to explain a bit better.

    I have a shirt in the center of the scene and I need these cloned eyeballs to always be pointed at the shirt, I was able todo this with a mo target easily, however when I apply a collider tag to the eyeballs the target tag no longer works.

    I am thinking maybe a solution would be to somehow make the eyeball texture face the shirt instead of the object? But I have no idea how todo that haha.

    Apparently my file size is too large to upload so here is a link instead.
    https://1drv.ms/u/s!Am_m3dn7SsFr6tVkLRHfY6MCuy2b1Q?e=Lx5cfr

  • Devon Dowler

    April 6, 2021 at 6:27 pm

    Also I opened your file and you did almost exactly what I needed, this is a huge help. Now Im going to try to apply this method to my file!

  • Devon Dowler

    April 6, 2021 at 7:54 pm

    I used a fracture object and put the eye under it with the target but Im still not getting the desired effect.

  • Jim Scott

    April 6, 2021 at 8:15 pm

    I downloaded your file but it is extremely slow on my system. Any chance you could provide a much simplified file with just a few objects that demonstrate your setup? (I also don’t have Octane, so if you could leave out all the Octane objects and materials I won’t have to delete them myself.)

  • Devon Dowler

    April 6, 2021 at 8:20 pm

    Sure, I will work on a quick test file

  • Jim Scott

    April 6, 2021 at 8:57 pm

    Try this: Make the fracture object the child of a null and place the dynamic tag on the null. Then put the null in a cloner to make as many eyes as you want. I think that should get you what you want.

  • Jim Scott

    April 6, 2021 at 9:10 pm

    It should just work with the fracture object as a child of the cloner with the dynamic tag on the cloner.

  • Devon Dowler

    April 7, 2021 at 6:57 pm

    Awesome, I think I got it working! Its a bit janky though, Im having issues where I cant manually set the initial point of rotation, ill figure it out.

    You have been a great help thanks!

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