creating a surface problem (reverse normal)

[dawnny68]

every time I creat a surface in the surface modeling mode.

Most of the generated faces are flipped to be generated. (yellow color face)

I don't know why.

Is there something solution about this matter?

[TheCADWhisperer]

Why is this a problem?

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[aliobidi]

Hi , 

you can use "reverse normal " tool from surface > modify 

[jeff_strater]

The normal direction is determined by a set of heuristics.  Here is one curve - extrude it one way, normal is up, extrude it the other way, normal is down.

In addition to being able to flip the normal, if you don't like the normal display (yellow on the back side), you can turn it off:

For most operations, the normal direction does not matter.  A few (offset, for instance), it sort of matters, since the default direction is determined by the surface normal.  But, you can always override that, if you need to.