Blender - Offset UV'S

Christian Fischer

hey guys,

if i try to offset the uvs by 1 using the uv-vertex input field (nomalized turned on) by adding 1 to the value and then offset them back by subtracting 1 they don't match 100% anymore.

this is what i do step by step:

create a sphere > do some quick uvs > duplicate the object > merge objects.
now i've got 2 objects with the same uvs overlaying eachother
i continue by doing this:
select the uvs of 1 sphere > activate "normalized" in the uv editor > add 1 to the number in the x: field
if i now subtract 1 again the uvs are not where they were before but it looks like the attached file.

does anyone have a solution for this?

Cheers Christian

JedTheKrampus

Blender expects you to use units of pixels rather than images. Just type "gx256<Return>" to offset your UVs, with normalized coordinates off, and you shouldn't have any problems with UV precision.

Christian Fischer

thanks you so much jed!!
works perfectly
do you maybe also know how to mirror uvs on symmetrical objects (topology wise) without altering the vertex ids?

JedTheKrampus

Is just the topology symmetrical, or are the vert positions symmetrical too?

JedTheKrampus

Usually if I need to have mirrored UVs I will delete half of the verts, duplicate the other half, mirror them over, and remove doubles if necessary. But you said you didn't want to alter vertex ids so that throws a wrench in that plan.

May I ask why you need to preserve vert ids?

Christian Fischer

in some cases i needed this in the past where the vertex id of a head mesh for example had to stay the same.
are you from austria btw, because of krampus?

oh .. and i really could use a relax uv tool as well, do you know a good one?
i tried the uv tool addon but the smooth function seems to be broken unfortunately

JedTheKrampus

Usually I find it adequate to re-unwrap an island with the E key in the UV/image editor. You can optionally pin some of the verts in the island if you need them to stay still. And I'm not from Austria, unfortunately. I'm from Kansas.