I am trying to build a simple diamond (woman's best friend type of diamond) and keep running into the error message "Some polygons could not be built: some edges already has 2 polygons". Here is an image of the poly's I am trying to fill. Does anyone know of a way for getting these filled or is there a simple work-around for this?

The problem is usually caused by Carrara not fully understanding what is the "inside" and the "outside" of the object. Sometimes you can correct it by deselecting everything and then just selecting one triangle and filling that one. Then Carrara will fill the others when you select all and use the "full polygons" command. I don't see any problem with the construction geometry in your image, but occasionally you will find that a vertex is wrongly connected if you dolly around the figure. Once that is fixed, all of the polys will properly fill. If neither of the above things help, select the whole object and go to the Weld command in the top menu and use the "Custom Tolerance" method setting an appropriate distance. The goal is to weld very close vertices together because sometimes there are overlapping vertices which LOOK connected but aren't.

I've also on occaision had doubled faces....very annoying. For that model above, with a lot of holes but not that many panels, I'd go ahead and empty all polys....run a weld to make sure there are no duplicate or disconnected edges...then fill again. If it doesn't fill right, I'll do the first fills manually to give Carrara the right idea.

More than likely you have multiple poly's present that are exactly on top of each other but yet already hinged off the same vertex. Select the entire mesh, then select weld and set the tolerance to a small value. This will weld ALL overlapping points and elminate duplicates. It's possible that some things will change. If all your ploys are triangles, I think you should be able to then select the entire mesh and fill polygons. Shouldn't be too much trouble. Remember to also select the whole thing and crease all your edges. -Kix

Thanks everyone for your help. I took your advice, un-filled all the existing polys, did a "select all" followed by a weld. This fixed it.

Thanks again!

Good to know about! I've had the mysterious double vertices and edges happen in the vertex room. I know I didn't make two copies of the same polygon, but somehow they exist. This sounds like a bug in C, particularly since so many folks knew about it. Glad there's a work around, though...

I've got a list of them...like the mystery seams that get added when I export a cylinder then re-import it.