Messed up mesh because of undo?
Hello,
I made this mesh in 3ds max 2014 (it's supposed to be a relief) by first making the contours of the relief as a flat plane and then extracting the polygons that were supposed to be higher than others. All polygons were quads. Then I applied the Turbosmooth modifier to make it smoother and cleaned up some parts of the mesh until I got a continuous mesh. No faces are inverted (because they'd be rendered invisible in that case because of the backface cull option).
Now, here's the problem: If I target weld any vertex and then undo it, these weird black shadows or marks appear randomly across the entire model. In some cases it's just one or two, in some cases it's tons of them all over. These black things shift a bit in appearance when orbiting around them, so they're some kind of shadow, and are about the size of one or four polygons each. There's no way to get rid of these except by deleting the polygons and creating new ones in their place, or by dividing the polygons into tris. I just make sure to save often and then open a recent save if I make the mistake of undoing something...
They also appear when rendering. I use the Nitrous engine and the Default Scanline renderer.
Here's a video describing it (specifically check out 3:00 to see the problem demonstrated at its most extreme):
[ame="
http://www.youtube.com/watch?v=gpiELxbl-G8"]00002 - YouTube[/ame]
Thanks in advance!
I made this mesh in 3ds max 2014 (it's supposed to be a relief) by first making the contours of the relief as a flat plane and then extracting the polygons that were supposed to be higher than others. All polygons were quads. Then I applied the Turbosmooth modifier to make it smoother and cleaned up some parts of the mesh until I got a continuous mesh. No faces are inverted (because they'd be rendered invisible in that case because of the backface cull option).
Now, here's the problem: If I target weld any vertex and then undo it, these weird black shadows or marks appear randomly across the entire model. In some cases it's just one or two, in some cases it's tons of them all over. These black things shift a bit in appearance when orbiting around them, so they're some kind of shadow, and are about the size of one or four polygons each. There's no way to get rid of these except by deleting the polygons and creating new ones in their place, or by dividing the polygons into tris. I just make sure to save often and then open a recent save if I make the mistake of undoing something...
They also appear when rendering. I use the Nitrous engine and the Default Scanline renderer.
Here's a video describing it (specifically check out 3:00 to see the problem demonstrated at its most extreme):
[ame="
http://www.youtube.com/watch?v=gpiELxbl-G8"]00002 - YouTube[/ame]Thanks in advance!
Replies
Max 2014 for me BTW.
Hope that is clear enough and maybe helps? Best of luck.
I've also experimented a bit and arrived at the conclusion that it's always the same faces that are affected (so it's not just random) no matter what I do, so there's got to be something special about these faces. Also, it pretty much only happens when undoing a target weld operation on ANY vertex, not when deleting, cutting, connecting etc. Also, all of these weird black halos (though not circular but n-gons really) always center around a vertex. When they're larger (though they're almost always small and just around one vertex), their corners center around vertices.
I've taken a look at affected faces and nope, they're not double, they have the same smoothing group as the surrounding vertices, there are no double vertices (they're all welded and everything) or edges... I'm completely clueless and just can't see what the affected faces have in common.
Though there's an easy fix (well it doesn't solve the problem but it "repairs" the mesh and gets rid of the anomalies) - just break the vertex in the center of one of these anomalies and weld it back again. The weird thing is that the ones I've "fixed" do not get affecte again when I target weld a random vertex and undo, though OTHER vertices/faces that weren't affected earlier now get this anomaly...
EDIT: PROBLEM SOLVED! All I had to do was select all vertices, break them and weld them back using 0,001 cm (depends on the model of course). For some reason all anomalies aren't removed the first time, so I just kept repeating that five times or so (breaking and welding all vertices) and now my model is completely free of these things AND when I target weld and undo, they don't appear anymore! So clearly, something was wrong with my mesh but it was easily fixed in the end anyway by breaking and welding all vertices several times. If anyone has any idea what might have caused it it'd still be very much appreciated of course.