Am 26.07.2013 00:28, schrieb Shay:
> Clipka posted the CSG first. You posted the math first. Can we call it a
> tie?
>
> That train was impressive. Used prisms*, so, imo, a whole other animal.

No, not really. There, too, it was all about cutting stuff away and 
adding stuff back in.

> * if you count prisms (and sweep approximations), you have to (?) count
> triangles, and is it really CSG at that point? It's a somewhat arbitrary
> distinction, but "real" CSG makes for a better game, imo.

The fun part is where you begin to round off the prisms. If you want to 
both bevel the edges of the front and back sides as well as round off 
the extruded shape itself (which is what I did for the train engine), 
spine-based prisms won't get you anywhere, because (or so I believe for 
certain reasons) if you widen or tighten a 3rd-order spline loop its new 
path will generally not have a constant distance to the original path, 
no matter how hard you try. So it's back to cylinders, tori and spheres 
again.

The only places where I "cheated" were the smokestack, the sand boxes, 
and the thick pipes leading from the boiler to the cylinders; these 
elements were modeled using blobs.

Oh, and the person I placed on the engine wasn't CSG either of course :-).

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