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DarkBASIC Discussion / How to rotate the car acorrding to the matrix

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DDD Productions
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Posted: 16th Apr 2004 23:42
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How do you rotate a 3D object (in my case a car) acorrding to the height/steepness of a matrix.

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zircher
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Posted: 17th Apr 2004 01:06
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The most common method is to sample the slope of the matrix at several points around the car and determine the angle from that. You can use get ground height to do that. The tricky part is determining when a wheel is over a drop-off and not skewing the vehicle at some crazy angle.

Another method discussed is to replace the matrix with an object and then apply normal collision logic or use the Nuclear Glory Collision DLL.
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BatVink
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Posted: 17th Apr 2004 01:25 Edited at: 17th Apr 2004 01:26
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Quote: "Another method discussed is to replace the matrix with an object and then apply normal collision logic or use the Nuclear Glory Collision DLL"


As far as I can work out, you still need to sample the ground height. I use NG's RayIntersectObjectPRO(). You can actually do this with one Raycast if you're not too bothered for pinpoint accuracy, using RayHitNormPRO()

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zircher
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Posted: 17th Apr 2004 06:22
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I used the NGC.DLL for serveral vehicle tests (spheres hitting a polygonal .X level made of tiles) and was very happy with the results. I got some nice slope sliding effects, etc.
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BatVink
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Posted: 17th Apr 2004 14:01
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Zircher, did you get as far as multiple vehicles? I'm still experimenting with NG and multiple collision spheres on cars.

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zircher
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Posted: 18th Apr 2004 00:04
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Can't say that I did. I was helping out another forum member with game ideas for the alienware contest and we ran out of time. The project hasn't gone further than a single vehicle moving over a combination of object tiles and module-like levels with rolling hills.
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TEH_CODERER
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Posted: 18th Apr 2004 16:53
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Look at the Tank Demo.

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DDD Productions
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Posted: 25th Apr 2004 22:46
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Sorry it's taken a while to respond,
I had already calculated the ground height of the four corners of the car. I just need the formula required to calculate the x and z angles.

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