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mamudesign avatar image
mamudesign asked Boris_ answered

Moving platform behaving erratically

I'm trying to build a moving landing platform,

Using a worldscript with waypoints and a Groundvehicle. The vehicle follows the path correctly, but


As soon as I add a collision to the groundvehicle (either a collision shape or a collision material), it tilts 45 degree and run away at high speed, ignoring the waypoints too

Any thoughts? Content provided as comment below

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WombiiActual avatar image
WombiiActual answered mamudesign commented

I spent a week making a thing like this. The problem seems to be it's colliding with its own wheels and you can't decide where the wheels are. Try moving the platform a distance from the center of the model. I may be able to share an example later.

Proof of concept (sorry, on phone) :

https://cdn.discordapp.com/attachments/1064793936188674058/1070387667843436564/2022-08-20_08-45-59.mp4


https://cdn.discordapp.com/attachments/1064793936188674058/1070387928737529956/HelidollyconceptENAX-1.mp4



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mamudesign avatar image mamudesign commented ·
Thanks a lot for the answer!!!

And the dolly pad is great, is a perfect application for the moving platform


With your suggestion, in my case, I find out that I have to raise the platform up to 4 meters from terrain to avoid the ground vehicle from tumbling all over

I have also find out that the cg_height and the wheel_radious don't affect any behaviour



Maybe the team can investigate more!



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WombiiActual avatar image WombiiActual mamudesign commented ·

1675286641560.png


Here! This is how far I had to move the platform from model center. The empties here are where I approximated the wheels to be after analyzing the turning behavior in the sim. This placement is safe and prevents it from colliding with itself.

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1675286641560.png (400.2 KiB)
mamudesign avatar image mamudesign WombiiActual commented ·
That's is interesting and pretty much confirm the distance value from the world origin I have also find


Gonna try to move my whole model on the Y axis too, should accomplish the task

Thank you again,.you had the right intuition!


And looking forward for a tech explanation from the team, knowing how stuff works can be interesting!

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Boris_ avatar image
Boris_ answered

Hello @mamudesign ,
I'm not sure yet, but it seems like it was done on purpose to keep the vehicles from being under the ground.

I've already asked the devs for more info and as soon as I get their feedback I'll let you know. In the meantime @WombiiActual has, I think, found an interesting approach ;)


Regards,
Boris

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