Working with metric units make the brush shake.

[Sjockey]

Hello ,

I started a new retopology on a simple sphere. My blender units are set up to metric centimeters and while I use Polystrips, Strokes, Relax or tweak tools my brush circle is shaking (scale up/down).
I do not have the issue if my unit settings are set on none(Blender default units).

Here is a video and my blender file showing the problem.
https://www.dropbox.com/s/kgfjwh66cisl6gr/BrushShakingIssueMetric.mp4?dl=0
https://www.dropbox.com/s/rucfeu4nxnp7m24/BrushShakeIssueMetric.blend?dl=0

Thanks

[vxlcoder]

Thanks for the report, @Sjockey!
This is very interesting. Looking into it now.

[vxlcoder]

With commit 453a9e5, RF now takes into account the scale length of the selected scene units, which should correct this issue. If you know how to use git, you can clone the release/2.0.0 branch and test it out. Otherwise, work in Blender Units only for now, because we will probably release a minor update soon that will contain this fix. Thanks for your report!

[Sjockey]

Thanks you for fixing !
I work in the video game industry and It's really important for me to have Retopoflow2 working with metric units. Usually I don't use blender units.

[vxlcoder]

tested; closing!

[vxlcoder]

Ack! This issue also shows up if near clip distance is too small (actually might not have been units). Reopening...

[vxlcoder]

I couldn't find a good solution to this. I believe it's a matter of floating point precision :(, which means that there might not ever be a good solution.

Instead, I've added a warning prompt at the start of RF. It will only show if the clip start is too small (<0.1), and it simply states that the brush size may jitter when moving the mouse.