Odd Lightmap UVW in Editor view

HAWK12HT

Hi all so i came across this NEW issue, may be its not new but new for me .







Ok lightmaps are all clean no overlaps no flips.
Exported as ASCII and FBX
Light builds fine no error messages and warning


So whats wrong with UDK showing me messed up Lightmaps UVWs, while all UDK defualt assets have no such criss cross going over.
I imported one mesh earlier with all separate lightmap UV clusters and was fine i see perfect result in editor view and not like above. So why is it doing with meshes that have stitched UVs?

Its bugging me please if anyone know respond.

HAWK12HT

Note: I am using chamfer edges to get that smooth feeling of highpoly and using 1 smooth group. Does UDK not like Ngons or Triangles ? I doubt that but still.

DeadlyFreeze

You probably have a vert to close to the edge of the UV space, so when it get's imported in UDK thinks it on the next grid over and moves it back to 0-1. Give it a little padding and see if it helps.

HAWK12HT

Oh thanks , I didnt update , Found the solution which is mentioned above already lol.

But now is the question that how in the world one will avoid light map seam as many say that fill 0 1 space entirely so shadows dont fall on wrong face.

I know off topic but just tooo many questions and problems with using UDK

JamesWild

HAWK12HT wrote: »

But now is the question that how in the world one will avoid light map seam as many say that fill 0 1 space entirely so shadows dont fall on wrong face.

I've never heard this before... you'll lose a tiny bit of the effective area by adding some padding but I don't think it should be an active detriment and I wouldn't be surprised if UDK stretches the bounds back out to 0, 0, 1, 1 when packing the lightmass tiles.

HAWK12HT

http://www.worldofleveldesign.com/categories/udk/udk-lightmaps-01-basics-and-important-principles-for-creating-using-lightmaps.php


I was refering to this tip section on this site.

DeadlyFreeze

What part of the article are you referring to, are talking about lightmap bleeding?

HAWK12HT

The one at end, where he show using planes as example, how light can bleed.

HAWK12HT

On the Grid SEction

unstoppablex

you don't really need that much padding so the UVs show up correctly, it'll work if you just keep the vertices on 0.001 and 0.999.

to keep light from bleeding you need to keep them a good distance from other UV islands, but this all depends on what lightmap resolution, as the higher the resolution, the closer you can bring these islands without bleeding.

here's a very good video explaining the whole lightmap bleeding:
[ame="http://www.youtube.com/watch?v=ntx10JMl9f4"]Fixing Lighting Seams in UDK - YouTube[/ame]

HAWK12HT

Thanks all for feedback, i have seen the video before . Its just that when we model most stuff is not plane if you know what i mean, Imagine a hexagon lets say as a plate of armour than you obviously end up in between black and white checkered area around corners and bam you have that issue of seams, unless you add some sort of trim in between the hex pattern.