What works with udims and what doesn't? Tweet

[OlaHaldor]

I've been trying to use udims on a sphere, to become the earth. All good with the diffuse - the 8 tiles show up as expected.
Is displacements supposed to work with udim as well? I can't make it work at least. Hopefully I'm doing something wrong.

[OlaHaldor]

Trying a new thing now. I stitched together the displacement into a single file. It lines up with the udim color texture.
I made a second UV set which is the whole sphere filling a single UV tile, so the UV's are distorted, but it should be fine when the texture is applied. I double checked that with the color texture. Looks good.
When I select the projection node for the displacement map and set it to use UV set 2, not 1, I would expect it to align properly to the geometry, but it does not.

To me it looks like it's still using UV set 1 which tries to cram it all in the visible geo. See the attached files.

[OlaHaldor]

Here's another one.. The displacement is connected as diffuse, and renders fine. It follows the UV set I applied it to. It also gives me instant feedback in Octane if I set it to use UV set 1.
But when I connect it to displacement, it just goes nuts and does not align at all.

What am I not getting here?

[Hesekiel2517]

I think Udim Workflow just doesn't work for Normal and Displacement maps:

https://render.otoy.com/forum/viewtopic.php?f=34&t=56939&p=292418&hilit=udim#p292418

[OlaHaldor]

Got any hints on how I can make the displacement behave when it's all in a single map as seen in my last post?

[face_off]

Both Normal or Displacement maps use the raw image file in Octane, so the UDIM node network implemented in the Modo plugin will not work.

Regarding your issue in the last image, I would need to see the mesh to comment. Perhaps there are some very long, thin triangles, which do not handle being displaced well in Octane. If you are prepared to put up with the limitations of the Modo Render Cache - you could apply the displacement map directly to the mesh in Modo, and then load the micro-displaced mesh into Octane. https://docs.otoy.com/manuals/products/modo/v3/modo901-specifics/. Enable the Polygon Displacement option in the Kernel->Settings panels to do this.

Paul

[OlaHaldor]

I'm would have to add an insane amount of subdivisions to make it render at the level of detail I need. I tried 10 and even up to 12 subdivisions, but it was sub par what I need. Not even close to the level Octane displacement can do.
I have attached the object with the two uv sets as used in the images above. It's set up with 8 udim tiles in set 1, and all the geo in a single tile in set 2.

I have tried to use a lower res image with all the 8 tiles stitched together to use as displace, and as shown above, it stretches and repeats when I connect it to displacement, but works fine when I connect it to diffuse.
You can test with any image really, and let me know what you find.

earth_2_uvsets.zip

(21.46 KiB) Downloaded 293 times

earth_2_uvsets.zip

(21.46 KiB) Downloaded 293 times

[face_off]

I'm not completely sure what I am looking at here. Is there perhaps a msg missing?

If you are using the Render Cache - you can increases the resolution by adjusting the Displacement Rate in the Shader Tree Render item.

Also, if using the Octane Displacement node, the displacement map will not wrap, so all your UV's will need to be in the 0-1 range.

I hope that helps.

Paul

[OlaHaldor]

I'll try to explain again.



The sphere is mapped in two UV sets.
In set 1 I have 8 UDIM tiles. This is where the diffuse color maps go.

In set 2 I have the entire sphere laid out to fill 0-1 so I can use the displacement map with it. (originally I wanted to use the much higher quality UDIM tile set, but stitched together a lower res image)

I don't get the quality I want from the modo displacement map, and as mentioned above, I tested a setting of up to 12 on the Catmull Clark subdivisions. The scene started to lag a lot, the quality was quite poor. So, not an option.


When I apply the displacement map through an Octane override, it wraps on the entire sphere - twice. It's like it's not using the UV set I created. I was unsure of why this happened, so I connected the image I'm using as displacement into diffuse - at it looks good. It does not distort. But when the same image map is connected to displacement in the octane override, weird stuff starts happening. Switching between UV set 1 and 2, or trying other ways to project the image on the mesh does not change anything. Whatever setting I use, it looks the same. Ref the images above.

For what it's worth, feel free to download the mesh I attached earlier too and give it a shot.


If it was confusing: I'm making this all in an octane override, nothing is created using the modo texturing/displacement stuff in the shader tree.

[face_off]

I don't get the quality I want from the modo displacement map, and as mentioned above, I tested a setting of up to 12 on the Catmull Clark subdivisions. The scene started to lag a lot, the quality was quite poor. So, not an option.

As I mentioned above - you would need to adjust the modo Displacement Rate, not the number of subd's. But yes, it will be laggy due to the high poly-count.

When I apply the displacement map through an Octane override, it wraps on the entire sphere - twice. It's like it's not using the UV set I created. I was unsure of why this happened, so I connected the image I'm using as displacement into diffuse - at it looks good. It does not distort. But when the same image map is connected to displacement in the octane override, weird stuff starts happening. Switching between UV set 1 and 2, or trying other ways to project the image on the mesh does not change anything. Whatever setting I use, it looks the same. Ref the images above.

Which version of the plugin are you using pls?

Paul