Hi Felix,

> Though it can read 2D splines elements, a circle becomes
> a kind of an incorrect rounded rectangle

That probably means it has a bug where it does not read the "weight" values of the spline properly.

NURBS curves are made of a control polygon hull where each point of the hull has both x,y,z coordinates as well as a weight value.

For simple freeform curves the weight values all have a value of 1 and have no effect - but for conic section curves like an exact circle the weight values do come into play and if they are just ignored instead of properly read in then you would get a result that looks like a kind of rounded rectangle rather than an exact circle.

If you use the Rebuild command in MoI that will fit a new freeform curve through the circle and the new freeform curve does not use weights, so using Rebuild could help to avoid this particular problem with the other importer.


> and a rectangle become some weird form.

Hmmm, that's kind of surprising since that should not involve any weights. I guess it is possible that they also don't pay attention to the degree value and think that everything is degree 3 like a freeform bendy curve usually is - lines are actually degree 1.

I guess if you use Rebuild on these with # of points mode, with at least 4 points for each segment, that will rebuild those lines as degree 3 curves and maybe that will match what the importer seems to be hard coded to use...


It sounds like there may be several different kinds of bugs in their importer though.


- Michael