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Dynamics; car falling thru ground

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Jukka Klemetti
Dynamics; car falling thru ground
on Aug 29, 2011 at 7:05:57 pm

I cannot figure this out: I´ve a car with multiple parts and a ground. I´ve added dynamics tags to them but the car keeps to fall thru ground. What would the settings be that I can drop the car to the ground?


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Brian Jones
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 4:47:51 am

what version of C4D and what type of Dynamics (if it's not R12)


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Jukka Klemetti
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 5:42:51 am

It is R12. I added dynamics tags from the Tags-menu.


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Bill Kelly
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 7:11:45 am

On the Floor try deleting the tag, then right click on the Floor in the Object Menu, go to Dynamics Tags, and choose Dynamics Body.

Or, in the Simulation menu, choose Dynamics Tags >> Create Collider.

Either one should work.




To see tutorials, articles, tips, free stuff, and more visit my post-production blog at http://thekellzone.com


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Jukka Klemetti
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 8:25:01 am

It works when there is one united object. It drops nicely on the floor. But when I try to use a car with separate parts, it falls thru.


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Bill Kelly
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 11:18:18 am

Take all the individual parts that need to be together as one object and group them into a Null Object. Apply the Rigid Body Dynamics tag to the Null Object. Repeat for each group of parts, keeping all the Nulls inside the car object.




To see tutorials, articles, tips, free stuff, and more visit my post-production blog at http://thekellzone.com


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Jukka Klemetti
Re: Dynamics; car falling thru ground
on Aug 30, 2011 at 1:06:29 pm

I got it working by putting Inherit tag to Compound collision shape.
I´m just following the greyscalegorilla.com´s tutorial. When I make simple box as a car body and cylinders as wheels, everything works as tutorial guides.

Now I´m trying the same with actual car model. Now the car body is falling on the ground after that inherit tag thing. I made wheels as simple cylinders, added connectors to all and put motors to the body.
The problem now is that the car body falls right on the ground and also wheels do the same. The body is nor falling on the wheels.


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sean bowerman
Re: Dynamics; car falling thru ground
on Jan 14, 2012 at 2:45:36 pm

hi, did you ever get this to work? i have exactly the same problem....


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Xavier Bonet
Re: Dynamics; car falling thru ground
on Apr 4, 2018 at 2:23:53 pm

In view that the OP didn't give us a more specific and clear follow up as to how he solved this issue, and that's there are others who are having the same issue, I'll add to this thread my own solution.

I built a rather complex car with various objects grouped into a null. I applied the Collider Body tag to my floor object and applied the Rigid Body tag to the car group. As the OP, I also found the car just fell through the floor.

To make it short, what I ended up doing was going into the Collision tab of the car's Rigid Body tag, and under Inherit Tag I chose Compound Collision Shape. I left everything else as is, and the result was that the car, in its entirety, started acting as a single object and bouncing off the floor, which is what I wanted.

So basically the Inherit Tag tells the Body tag what it should do with the children of a group object. The Compound Collision Shape clearly means the tag should first compound the entire group and its children as one shape and treat it as such. The Apply Tag to Children option basically applies that same action to each of the child elements... which results in an aerial explosion! as each element tries to fall and collides with every other element! Haha. (Perhaps it could work for an aerial car explosion.) And the None setting basically just sets the object to be dynamic and then allows each child to have its own setting... In practice, when you give each child the same tag manually and set the parent setting to None, the card doesn't explode in mid air as I stated before, now it falls and explodes upon hitting the surface...

Now you know. ☺ Cheers!


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