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Thread: Stick car to varied ground?

  1. #1
    digital witchdoctor objuan's Avatar
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    Stick car to varied ground?

    I know I've seen posts on this before, but searching isn't quite bringing it up for me like I hoped.

    I have a car on a road that ramps up and down a little bit. How can I just animate the car's center null in X and Y, and automatically put it's Y on top of my road mesh? And preferably also adjust pitch?

    Thanks!
    Ocean Byrne
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  2. #2
    Curmudgeon in Training Ma3rk's Avatar
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    You might look into RayCast, but your best bet assuming you've LW 2018 is to examine the car scenes under Bullet_Dynamics folder.
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  3. #3
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    If you choose not to use Bullet for the collision detection, using RayCast Geometry is fairly straightforward.

    1) Keyframe your car's Y position above the road at all points and the X,Z positions to define its path across the surface
    2) Use RayCast Geometry to detect the road
    3) Use the ConvertHitNormalToHPB node to convert the RayCast Geometry Hit Normal output to Heading, Pitch and Bank on the car

    I normally extract the Pitch and Bank using Vector Scalar nodes, and use Align to Path to control the vehicle's Heading.

    Using Bullet Constraints as in the example LW2018 scenes will probably give a more realistic scene if you want / need the wheels to adjust individually to the variable ground.

    The ConvertHitNormalToHPB node is in the LW2015 content under Nodes=>RayCast Assist=>RayCast-NodalMotion folder, but doesn't appear to be included in the LW2018 content.

    mTp

  4. #4
    Remember Wade's Avatar
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    Others have done a good job of it - https://www.youtube.com/watch?v=spDHrFATxXI but this is past my knowledge. Looking forward to seeing where you take it.

    AND THIS GUY!
    Last edited by Wade; 08-13-2018 at 09:18 AM.
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  5. #5
    digital witchdoctor objuan's Avatar
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    Mine will be nowhere near as cool as Dr Melon there. That is a nice rig, and a cool model. Thanks for the tips y'all.
    Ocean Byrne
    humble pixel farmer
    www.moceandesigns.com

  6. #6
    ack ack Markc's Avatar
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    Rebel Hill has some tutorials (but they are not free).
    Available on Liberty 3D website......

    Click image for larger version. 

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  8. #8
    areté adk's Avatar
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    Quote Originally Posted by erikals View Post
    Oh cool ! Didn't even know this was available. I really need to go through ALL the tools Oliver has
    He's so prolific that it's hard to keep up.

  9. #9

    he's a Coding Monster!  

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    Axes grinder- Dongle #99
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    Excellent thread!
    They only call it 'class warfare' when we fight back.
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  11. #11
    Super Member XswampyX's Avatar
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    Bullet will do it!



    Here's the scene. I've added in some steering, just rotate the null "steering".
    Attached Files Attached Files

  12. #12
    Carbon fibre dongle® 50one's Avatar
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    Oddly enough, that's quite entertaining to watch Swampy

  13. #13
    Super Member XswampyX's Avatar
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    Quote Originally Posted by 50one View Post
    Oddly enough, that's quite entertaining to watch Swampy
    Ta!

    I left a lot of the bounce in so you could see that it was working, but then it came out almost like it was a cartoon animation, also the poor old cart is a slave to gravity. It has no input into this scene.

    Poor old bouncy cart. :-D

  14. #14
    Curmudgeon in Training Ma3rk's Avatar
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    Quote Originally Posted by 50one View Post
    Oddly enough, that's quite entertaining to watch Swampy
    Ya, wasn't exactly a Test test, but then once ya get playing with Bullet, these things happen.
    Earth can't be flat otherwise cats would have pushed everything off the edge!

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  15. #15
    areté adk's Avatar
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    Hot diggity damn XswampyX that looks very fun to play with ... gotta check that out when I have time

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