Im watching some youtube videos. mainly on automotive modeling which I would like to do, they use this technique to blend 2 surfaces together but I don't quite understand what going on, mainly cos language difference and is not moi 3d.
but maybe its possible to do something similar a different way.

I took some screenshots





firstly two surfaces not connected intersecting


at this point seems to lay plane over top


plane gives impression surface is blended, even tho geometry is still underneath


final frame is like this, this I see often sometimes on car models.



this is me trying to understand and duplicate what I see. I projected curves then sweep a curve to create blending effect.
does anyone understand what is being shown and can help me understand.

link to video if needed http://www.youtube.com/watch?v=WszmgbohMZs

WHat you are seeing that is confusing you is just a function of the interface of the other software compared to MoI. It's the way NURBS surfaces work. The underlying surface always remains.

In MoI, you just use the fillet or blend tool. the fact that the original surfaces disappear is just semantics. If you want to depict the pre-post operation, copy the pre, then paste it back in.

Hi mrjynx, Alias has a "Curve on surface" entity that associates a curve to live on a surface where it can be in the middle of the surface rather than only at a trimmed edge of the surface.

The part where you write: "at this point seems to lay plane over top" - that doesn't look like a plane, it looks like a blend is being created between those 2 "Curve On Surface" entities.

You also wrote: "plane gives impression surface is blended, even tho geometry is still underneath" - that's because it is a blend, it's just a blend between 2 "Curve On Surface" curves in the middle of the surfaces rather than between border edges.


That Alias software is tremendously complex, one of the ways that MoI keeps things simple is by not having as many different kinds of objects, so in MoI the only kind of curve that is implicitly attached to a surface is an edge curve, so you need to blend between boundary edges in MoI and not between curves somewhere in the middle of surfaces like you show there.

Hope this helps explain what you are seeing there.

- Michael

okay I think I understand now. thank you for these explanations.