ghost faces and edges after inserting an edge

[Anonymous]

Guys, can anyone help me pls.

When I insert an edge in on a t spline surface (face) there are ghost edges on adjacent faces that create ghost faces. as you can see on the first screenshot. Can someone tell me how to get rid of them and to clean up my geometry.

Thnx.

Ivan

[deyop · Accepted solution]

This is an artifact of the method we use to display the model when it is in "Box" mode.  As seen in the "Control Frame" display mode the smooth representation doesn't show those artifacts.  Also when I convert a similar model the solid model is the same as the smooth T-Spline.  

With the few number of planar faces displayed when in "Box" mode the graphics system is just confused by how to create more display triangles.  Your geometry is fine.  It is just the display mode that is suffering.  I have submitted a defect FUS-16562.

Sorry for the problem.

[dunderhead · Accepted solution]

I'll vote for fixing this. I've been bothered by this problem, too.  Here it seems like the planar pentagons each is broken into a triangle and degenerate quad for rendering purposes, but that doesn't always work for a non-convex polygons!

Another artifact comes from skewed quads (http://en.wikipedia.org/wiki/Skew_polygon). The current choice of bilinear interpolation is not always consistent with the smooth form (the diagonal fold seems to be choosen arbitrarily). I should have saved an example but didn't! You might want to look into this problem as well: the simplified representation in box mode could be made to better reflect smooth mode. But then you'd have to compute the smooth mode, at least locally, as we model in box mode...  The skewed quad representation would be a nice little subject to discuss in the manual.

[Anonymous]

Thanks guys

I really appreciate your help.

Ivan

[dunderhead]

Here's another bug (below pic) possibly related to defect FUS-16562. I drew a hexagon, but it is rendered here (when mouse hovering over it):

• a hexagon and 
• a pentagon

at the same time!!!

No, this is not the case of a subtly unfused edge. For example, I can use Insert Point, to split the hexagon into two quads by connecting points a and b. Usually of course, I'll make quads.