Converted Mesh

shorty feden · 15th January 2015, 12:55 PM

Hi all,
I build virtual sail boats in one of the virtual worlds and found this software (Sailcut CAD) to make sails for them. When i export the file from it and save as DXF and then import it in AC3D It becomes very large but looks ok. When I import it into the virtual world using there mesh import as a DAE file this photo attached is what i get. I've tried combining them but when i upload it I now get transparent faces on some of the sail.
Any body have a suggestion on fixing this or maybe another sail making software that I haven't found?
Maybe convert the file to another format and then import it?

Shorty

Andy · 15th January 2015, 02:54 PM

I'd check the normals in AC3D. The sail program may be outputting incorrect triangles in the DXF. If it support .obj export, that's probably better.

In AC3D, select everything and make it single sided. Have a look at it from both sides - one side should be invisible.

AC3D's DAE export is well used so I don't think the problem is there.

jentron · 15th January 2015, 09:22 PM

There is a sample dxf file here:
http://sourceforge.net/p/sailcut/cod...dxf?format=raw
It shows just what Andy was talking about... The triangles are randomly ordered.

shorty feden · 16th January 2015, 11:54 AM

Quote:

Originally Posted by Andy

I'd check the normals in AC3D. The sail program may be outputting incorrect triangles in the DXF. If it support .obj export, that's probably better.

In AC3D, select everything and make it single sided. Have a look at it from both sides - one side should be invisible.

AC3D's DAE export is well used so I don't think the problem is there.

Well Im about to just give up. First you only have these files you can export too.
DXF
SVG
TXT
XML

The DXF acts weird when brought into AC3D to start with. The grid looks to be so far away you can't even move it to there. The whole thing is so big also when brought in. The norms you can forget about as you can hardly see them sticking out and i see nothing in settings to adjust those or color change.
If you want me to send the DXF to you so you can look I will do that, Just send me an email or I can post it here I guess. Really a shame I cant use this. Would save me a lot of time making sails. Making them AC3D doesn't work very well and they look really rough. Now Hexagon has a tool (Manip) that would work, as it lets you high light a group of vertexes and it pulls or pushes the vertexes but not all the same distance.Nice feature to have which lets you contour them without moving one at a time. Sighs I might try building a sail in it.

Thanks guys

Shorty

Andy · 17th January 2015, 03:02 PM

To make a sail in AC3D create a mesh (with quads, not triangles) and press subdivide a couple of times. Then you can simply move some of the vertices to create the curved surface.

As I think we identified above, the reversed-triangle problem is not in AC3D - it's the output of the sail program.

Press 'f' to center the selection in the view - it sounds like the world position of the sail is not around the origin. Alternatively, move it to the origin by pressing 'move-to'. It's probably massive too, that's why you can't see the normal lines. To change the visible size of the lines, it's File->Settings->appearance-Size-of-display-normals.

Andy · 17th January 2015, 03:14 PM

Depending on the detail you want, you can use a more detailed mesh or divide up an existing one. In this example if you move the inner vertex, you'll get a nice bulge.

15th January 2015, 12:55 PM	#1
shorty feden Junior Member Junior member Join Date: Apr 2012 Posts: 7	Converted Mesh Hi all, I build virtual sail boats in one of the virtual worlds and found this software (Sailcut CAD) to make sails for them. When i export the file from it and save as DXF and then import it in AC3D It becomes very large but looks ok. When I import it into the virtual world using there mesh import as a DAE file this photo attached is what i get. I've tried combining them but when i upload it I now get transparent faces on some of the sail. Any body have a suggestion on fixing this or maybe another sail making software that I haven't found? Maybe convert the file to another format and then import it? Shorty Attached Thumbnails

15th January 2015, 02:54 PM	#2
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Converted Mesh I'd check the normals in AC3D. The sail program may be outputting incorrect triangles in the DXF. If it support .obj export, that's probably better. In AC3D, select everything and make it single sided. Have a look at it from both sides - one side should be invisible. AC3D's DAE export is well used so I don't think the problem is there.

15th January 2015, 09:22 PM	#3
jentron Senior Member Professional user Join Date: Nov 2007 Posts: 139	Re: Converted Mesh There is a sample dxf file here: http://sourceforge.net/p/sailcut/cod...dxf?format=raw It shows just what Andy was talking about... The triangles are randomly ordered.

17th January 2015, 03:02 PM	#5
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Converted Mesh To make a sail in AC3D create a mesh (with quads, not triangles) and press subdivide a couple of times. Then you can simply move some of the vertices to create the curved surface. As I think we identified above, the reversed-triangle problem is not in AC3D - it's the output of the sail program. Press 'f' to center the selection in the view - it sounds like the world position of the sail is not around the origin. Alternatively, move it to the origin by pressing 'move-to'. It's probably massive too, that's why you can't see the normal lines. To change the visible size of the lines, it's File->Settings->appearance-Size-of-display-normals. Attached Images Last edited by Andy; 17th January 2015 at 03:10 PM.

17th January 2015, 03:14 PM	#6
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Converted Mesh Depending on the detail you want, you can use a more detailed mesh or divide up an existing one. In this example if you move the inner vertex, you'll get a nice bulge.