Indigo Renderer Forum

A simple low poly sphere get 5 subdivides with smoothing to smooth the mesh during subdiv.
Wrapping U/V is needed to get the texture to work probably, but some small artifacts are still there
See attached files (low res texture included)

The artifacts are in the area where texture artifacts happen when NOT using U/V wrapping...

Without smoothing (that is the point here!) I also get artifacts... but different ones!

I have got strange results using subdivision + smoothing without even using textures. The resulting mesh is not smooth. Try subdividing and smoothing a wineglass model and you'll see what I mean.

yes, the texture is only a help to show the quite nice U/V Wrap of the texture.... besides of the artifacts...

Also very annoying are the artifacts generated on closeup to subdiv meshes when "View Dependent" is checked! This should really have a threshold to the edges of the camera or even have a option to combine with backface culling...

I would like to take this thread back from the death & forgotten.

With Indigo 2.2 stable smoothing & subdiv still generates Texture chaos, here 3 images:

Zom-B wrote:I would like to take this thread back from the death & forgotten.

With Indigo 2.2 stable smoothing & subdiv still generates Texture chaos, here 3 images:

subdiv_no_smoothing.jpg

subdiv_wrap.jpg

subdiv_no_wrap.jpg

So now I understand it, I had the same issue a few time ago. It was so strange I didn't knew where to begin. I had some instantiated scene and it was all messed up, just like the warp image.

I'm adding my weight to bump the thread, thanks Zom-B !

I'm not sure what is causing this in Indigo's smoothing approach, perhaps a simple bug ? Or merging should occur also for UVs (welding) ? Or UVs should (not ? optionally ?) be smoothed along with mesh ?

In case of doubt, perhaps deconstructing the meshing/UVing operations into more options would help debug ? I'm fond to explore that

Big smoothing issue indeed, reducing smoothing usage to non-textured objects. Meanwhile subdivide the mesh externally and use displacement for details only (subdivisions=ON, Smoothing=OFF).

Hi Zom-B,
the whole subdivision code needs a thorough going over, to make it faster, as well as to fix the texturing artifacts you mentioned, as well as some smoothing issues. I'll try and find time for this soon.

Super awesome news master Ono

Thanks in advance, the whole subdiv smoothing bug is a real showstopper in my workflow

I'm also looking forward to multithreaded subdiv, or even a GPU based approach...

Me and Yves will take a look at this for 2.4. Let us at the core.