Bounding shapes

There's nothing more horrible than bounding shapes, which don't fit to the car.
So I recommend that you spend some time making bounding shapes. I'll give you some tips.

You can have more than one shape, just put 2 (or more) to "Number of 'Bounding shapes' entries".
Usually I put the body in one bounding shape, and roof in another. So that makes two bounding shapes' entries total.

There is an easy way to create bounding shapes: Make a simple mesh to cover the car. (not very detailed: 32 points is maximum)
Then define the triangles, and select "file/export .ASC"
Then start Plaything 2, and use its "object/convert .ASC to physics shape" Plaything creates a textfile, and just have to copy those bounding shapes into your car's textfile.
I don't use this with cars, I define the bounding shapes myself.

Only first three numbers in every line are necessary. The other three lines are notes, so you know what I'm talking about here.

2                       // Number of 'Bounding shapes' entries.

// Bounding shapes entry #1
polyhedron              // Type
14			// Body

-0.18 , 0.055 ,-0.4	// L B F1    , 1    (Left , bottom , front)	
-0.18 , 0.1   ,-0.42 	// L C F1    , 2    (Left , center , front)
-0.18 , 0.17  ,-0.26 	// L T F2    , 3    (Left , top , front)
-0.18 , 0.2   , 0.36	// L T R3    , 4    
-0.18 , 0.07  , 0.35	// L C R2    , 5  
-0.18 , 0.04  , 0.04	// L B R1    , 6  
-0.18 , 0.04  ,-0.18	// L B F3    , 7   
 0.18 , 0.055 ,-0.4	// R B F1    , 1    (Right, bottom , front)
 0.18 , 0.1   ,-0.42	// R C F1    , 2  
 0.18 , 0.17  ,-0.26	// R T F2    , 3   
 0.18 , 0.2   , 0.36	// R T R3    , 4   
 0.18 , 0.07  , 0.35	// R C R2    , 5  
 0.18 , 0.04  , 0.04	// R B R1    , 6  
 0.18 , 0.04  ,-0.18	// R B F3    , 7  

polyhedron              // Type
8			// Roof

-0.17 , 0.17 ,-0.22	// L B F     , A
-0.1  , 0.24 ,-0.07	// L T F     , B  
-0.1  , 0.24 , 0.04	// L T R     , C 
-0.17 , 0.2  , 0.28	// L B R     , D 
 0.17 , 0.17 ,-0.22	// R B F     , A 
 0.1  , 0.24 ,-0.07	// R T F     , B  
 0.1  , 0.24 , 0.04	// R T R     , C 
 0.17 , 0.2  , 0.28	// R B R     , D