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Outerra Tech Demo download. Help with graphics driver issues

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Author Topic: Importer and vehicle physics video  (Read 35893 times)

Midviki

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Re: Importer and vehicle physics video
« Reply #60 on: February 12, 2013, 04:21:51 pm »

My wheels are spinning on the wrong direction.. I mean.. the animation.The physics works just fine... but the wheel animation seems to be working 90* degrees opposite of how it should work.

Its the same code as in the video for the BMW, and the wheels they don't roll, they flip like a coin.Any advice?
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cameni

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Re: Importer and vehicle physics video
« Reply #61 on: February 12, 2013, 04:36:34 pm »

Likely the axes on the wheels (in the model) are not oriented correctly.
By default wheels roll around the x axis, and steer around the z axis.
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hhrhhr

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Re: Importer and vehicle physics video
« Reply #62 on: February 12, 2013, 04:55:41 pm »

Outerra uses "a rarely used" a coordinate system where the "left" is equal to +X. Most 3D-editors think that the "left" means -X ;)

importing DAE obtained from SketchUp, for example, to properly display and animation has to conclude the whole model in a group and rotate it 180 degrees around a vertical axis.
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Midviki

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Re: Importer and vehicle physics video
« Reply #63 on: February 12, 2013, 05:03:53 pm »

Likely the axes on the wheels (in the model) are not oriented correctly.
By default wheels roll around the x axis, and steer around the z axis.

So... any idea how would I observe if they are.... hmmm... I think I know...

So it is like this.. I have my object rotated from max cause it was facing wrong direction.. but now... the wheels face the wrong direction.Nice.. this will be a good tip for new comers. ;D

Thx again for the help.
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ZeosPantera

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Re: Importer and vehicle physics video
« Reply #64 on: February 14, 2013, 08:50:02 pm »

Is there some way for people to add a friction to the body of vehicles? I rolled the 8x8 (thanks to the better CoG) and it went sliding away like a giant ice cube..
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cameni

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Re: Importer and vehicle physics video
« Reply #65 on: February 15, 2013, 01:04:49 am »

That sliding is a bug, since I updated the Bullet lib it started sliding again, not being able to resolve friction constrains precisely, for some reason.
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ddenn

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Re: Importer and vehicle physics video
« Reply #66 on: February 15, 2013, 02:48:43 am »

I notice that a few vehicles could collide with each other, I guess using their bounding boxes as collision meshes. Could it be possible to use that boxes for collisions with ground? Just reduce down part of the bounding box by wheel radius to allow wheel interaction with the ground.
« Last Edit: February 15, 2013, 02:54:23 am by ddenn »
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cameni

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Re: Importer and vehicle physics video
« Reply #67 on: February 15, 2013, 03:10:24 am »

Yes that's the plan, once I get around it in Bullet vs our custom collider. Should be able to use convex meshes for collision then, and I'll make the collision box adjustable from the script as well.
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