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Bwiser52

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Reply with quote  #1 
I need help! I just started using SU and I am trying to show a truck jumping. I have made a path and the truck will follow it, but I can not change the angle of the truck to follow the contour of the path. It stays horizontal to the ground. Is there a video or directions to show how to accomplish this?
davew

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Reply with quote  #2 
This doesn't seem to hard to me.  Maybe I'm misunderstanding.  Make sure you turn Rotate Object along a path off, if you want the truck to "jump" up in elevation.  You mean need more than one path.  But I have attached a rotate wheel animation to sure a change in elevation.  If you had a small arc in the path that might do the trick as well.  But don't expect 3D Studio type real looking jumps and rocky motions.
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David Wayne
Bwiser52

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Reply with quote  #3 
Maybe I'm not explaining it correctly?
For example, I used proper animation, with positions and scenes, I was able to move the truck along a path up a ramp( angling/rotating the truck with angle of the ramp), then flatten out in air, then back down a ramp. That worked, but it was to jerky looking.
I thought using SU would look smoother while playing. It did, however the truck stays parallel with the green axis even on the arched section. Is it possible to angle/rotate the group/component as I did using the proper animation?
davew

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Reply with quote  #4 
If you choose the Rotate Objects Along Path option (Edit the Path), the object or groups will rotate along the path.  I have included two possibilities.  The trouble with the option to rotate along the curve, in this case, the truck is too long and needs to sink below the ground plane to go up the curve.
Hopefully someone could create a design that accounts for the trucks length and sloop is a little more gradual that my quick animation.

 
Attached Files
mp4 truck-not-rotate.mp4 (235.81 KB, 41 views)
mp4 truck-rotate.mp4 (257.44 KB, 46 views)


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David Wayne

Bwiser52

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Reply with quote  #5 
Those are exactly the the two issues I ran into.
So based on that, I am assuming the movement I am trying to accomplish is not possible? An object can only move along or rotate around a path? It can not move while in the path? Can I separate it into scenes, adjusting the angle between scenes?
davew

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Reply with quote  #6 
What I'm finding that its nearly impossible to get an object like a truck that might be 17 meters long to move up an include of say 10 degrees and 20 meters long and make it look realistic. SU Animate does not know that the front of the truck needs to go up first. It might make more sense to break the truck up into smaller components.
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David Wayne
davew

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Reply with quote  #7 
I don't think it matters where the path is EXCEPT if you draw a path on a face, and it intersects another line, SketchUp will break the line and therefore the path will be broken.
What I was saying was that for a long piece of equipment like a truck going up a hill, you have to design the slope so as it appears the truck is not floating over the hill.  If the truck is relatively long compared to the length of the slope, it seems impossible to do.
You can do things like this round wheel example easily enough.

 
Attached Files
mp4 wheel-up-a-slope.mp4 (165.17 KB, 33 views)
skp wheel-up-a-slope.skp (39.20 KB, 15 views)


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David Wayne

davew

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Reply with quote  #8 
Ahh...here's a better one.  Truck up a slope. Use sandbox from countour to draw the slope.

 
Attached Files
skp truck-cab-up-a-slope.skp (1.88 MB, 15 views)
mp4 truck-up-a-slope.mp4 (95.46 KB, 25 views)


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David Wayne

davew

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Posts: 180
Reply with quote  #9 
I have a new sample of a truck-trailer going up a slope.  This one is a bit better.  I have attached the models as well. The placement of the path seems very important.  For example, the path's curve has to match the slope's curve in length.  If the path extends beyond the slope model (created using Draw--Sandbox --contour), the truck missing does not quite stay on top of the slope's surface.
Also, the beginning of the path seems to be important.  Or does it?
The truck-trailer models came from Podium Browser.  The wheels don't rotate though.

 
Attached Files
mp4 truck-trailer-up-a-slope.mp4 (769.56 KB, 28 views)
skp truck-trailer-up-a-slope.skp (3.87 MB, 7 views)


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David Wayne

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