Mirror Modifier wrong UV Offsets #56324

New Issue

Yevgeny Makarov · 2018-08-11T21:08:35+02:00

Yevgeny Makarov commented

2018-08-11 21:08:35 +02:00

Blender Version
Broken: 2.79.6

Short description of error
The "Flip U/V Offset" options of the Mirror Modifier
should shift the flipping point from the 0.5 (as tooltips says).

For example, the Offset 0.25,
then flipping point should be 0.75 (0.5 + 0.25),
but it's actually 0.625.

mirror-modifier-uv-offset.blend

Mirror Modifier
There are two UV offsets: "Flip U/V Offset" and "U/V Offset".

What's the difference?
They seem to be doing the same thing.

for (; j-- > 0; dmloopuv++) {
  if (do_mirr_u) dmloopuv->uv[0] = 1.0f - dmloopuv->uv[0] + mmd->uv_offset[0];
  if (do_mirr_v) dmloopuv->uv[1] = 1.0f - dmloopuv->uv[1] + mmd->uv_offset[1];
  dmloopuv->uv[0] += mmd->uv_offset_copy[0];
  dmloopuv->uv[1] += mmd->uv_offset_copy[1];
}

https://developer.blender.org/diffusion/B/browse/master/source/blender/modifiers/intern/MOD_mirror.c$262

**Blender Version** Broken: 2.79.6 **Short description of error** The "Flip U/V Offset" options of the Mirror Modifier should shift the flipping point from the 0.5 (as tooltips says). For example, the Offset 0.25, then flipping point should be 0.75 (0.5 + 0.25), but it's actually 0.625. [mirror-modifier-uv-offset.blend](https://archive.blender.org/developer/F4203053/mirror-modifier-uv-offset.blend) ----- **Mirror Modifier** There are two UV offsets: "Flip U/V Offset" and "U/V Offset". What's the difference? They seem to be doing the same thing. ``` for (; j-- > 0; dmloopuv++) { if (do_mirr_u) dmloopuv->uv[0] = 1.0f - dmloopuv->uv[0] + mmd->uv_offset[0]; if (do_mirr_v) dmloopuv->uv[1] = 1.0f - dmloopuv->uv[1] + mmd->uv_offset[1]; dmloopuv->uv[0] += mmd->uv_offset_copy[0]; dmloopuv->uv[1] += mmd->uv_offset_copy[1]; } ``` https://developer.blender.org/diffusion/B/browse/master/source/blender/modifiers/intern/MOD_mirror.c$262

Yevgeny Makarov commented

2018-08-11 21:08:35 +02:00

Added subscriber: @jenkm

Campbell Barton was assigned by Yevgeny Makarov

2018-08-11 21:10:54 +02:00

Bastien Montagne commented

2018-08-12 12:59:30 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2018-08-12 12:59:30 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2018-08-12 12:59:30 +02:00

Bastien Montagne commented

2018-08-12 12:59:30 +02:00

Please use this bug tracker for reporting bugs. General discussion and inquiries like that shall go through IRC (#blendercoders on freenode.net) or ML (bf-committers@blender.org).

Yevgeny Makarov commented

2018-08-12 13:57:42 +02:00

@mont29

OK, "Flip U/V Offset" should shift the flipping point from the 0.5 (as tooltips says).

For example, the Offset 0.25,
then flipping point should be 0.75 (0.5 + 0.25),
but it's actually 0.625.

There is a bug, (or incorrect tooltip).

mirror-modifier-uv-offset.blend

@mont29 OK, "Flip U/V Offset" should shift the flipping point from the 0.5 (as tooltips says). For example, the Offset 0.25, then flipping point should be 0.75 (0.5 + 0.25), but it's actually 0.625. There is a bug, (or incorrect tooltip). [mirror-modifier-uv-offset.blend](https://archive.blender.org/developer/F4203053/mirror-modifier-uv-offset.blend)

Yevgeny Makarov changed title from ~~Mirror Modifier two UV Offsets options~~ to Mirror Modifier wrong UV Offsets

2018-08-13 08:28:50 +02:00

Yevgeny Makarov commented

2018-08-13 08:28:50 +02:00

Changed status from 'Archived' to: 'Open'

Yevgeny Makarov reopened this issue

2018-08-13 08:28:50 +02:00

Bastien Montagne commented

2018-08-13 11:26:06 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2018-08-13 11:26:06 +02:00

Bastien Montagne commented

2018-08-13 11:26:06 +02:00

Things are working as expected, 0.25 means flipping point is at 0.75, which is the case (taking into account things are mirrored, line between D2 and D3 columns is at 0.75 of the mirrored face). Agree those two settings (flip offset, and offset) end up doing the same thing, but there is no bug here.

Things are working as expected, 0.25 means flipping point is at 0.75, which is the case (taking into account things are mirrored, line between [D2](https://archive.blender.org/developer/D2) and [D3](https://archive.blender.org/developer/D3) columns is at 0.75 of the mirrored face). Agree those two settings (flip offset, and offset) end up doing the same thing, but there is no bug here.

Yevgeny Makarov commented

2018-08-13 14:29:02 +02:00

I just read the tooltip as "move the flipping point and then flip over it",
but here it first flips and then moves, i.e. it's just a offset.

I just read the tooltip as "move the flipping point and then flip over it", but here it first flips and then moves, i.e. it's just a offset.

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Mirror Modifier wrong UV Offsets #56324