How can I tile with precision mappig?

NAIMA · Jan 2021

Hello , My attempt is to segment a huge map of 8192 resolution into 12 or more parts to cover a whole object, I have modeled the object as a single item , I have created the maps and the uvmap is made of 12 portions arrayed in a grid of 16 spaces, the objective is to load a single cut of this mega texture like 2k image into each ID of the model , but despite the procedure is working for me in general , it doesn't in the precision as the seams somehow do not align perfectly and so I get those weird ugly seams ... can someone perhaps poit me to a better system to do what I want to do?

https://i.gyazo.com/3301c1fed840fbb111d3524f502e3710.jpg

https://i.gyazo.com/9d3fd04cbe95b761cd2ec55084c1e818.jpg

https://i.gyazo.com/eb3c10781b0c87a6faad607db2d99f0b.jpg

I want the object to be a single item and to have several ID poligons to have different textures to reconstruct the original 8k texture ,

I am using 3dsmax 2017 or eventually I can use 2021 I used substance to bake ttextures and x normal , composed several maps in photoshop , I am only needing 3 textures , diffuse, normal and specular .

Really thankyou for any help !

NAIMA · Jan 2021

Ok looks like UVTiles might help me get to what I want to do , but how I do setup in 3dsmax to make it work with SPainter?

https://docs.substance3d.com/spdoc/uv-tiles-197427749.html

Eric Chadwick · Jan 2021

Are you ultimately rendering in Max only, or are you going out to a game engine?

If the former, why not just keep the 8192 whole?

If the latter, you'll need Clamp mode for the UVs, so it doesn't try to tile the texture.
http://wiki.polycount.com/wiki/Uvs#UV_Address_Modes
This will solve the seams in-game.

Unfortunately, Max doesn't have a Clamp mode. Though you can try a combo of Tile, Offset, and Mirror in the Bitmap node to emulate it.

NAIMA · Jan 2021

Eric Chadwick said:

Are you ultimately rendering in Max only, or are you going out to a game engine?

If the former, why not just keep the 8192 whole?

If the latter, you'll need Clamp mode for the UVs, so it doesn't try to tile the texture.
http://wiki.polycount.com/wiki/Uvs#UV_Address_Modes
This will solve the seams in-game.

Unfortunately, Max doesn't have a Clamp mode. Though you can try a combo of Tile, Offset, and Mirror in the Bitmap node to emulate it.

For Ingame clamp mode is automatic in Substance?

Or

Usually in Photoshop I used a plugin from flaming pear that had a solidify effect to create extension of the texture .

Eric Chadwick · Jan 2021

Clamp is different from Solidify.
Clamp is what happens outside the UV square, not within the texture. Repeat is the default mode, which tiles the texture.

Image: https://us.v-cdn.net/5021068/uploads/editor/db/v2fjic6nh0nv.png

What is the final output for your model? Realtime in a game engine or viewer, or rendered in an offline renderer?

Eric Chadwick · Jan 2021

Also, why are you using such an absurdly high resolution?

Instead you could use tiling textures and texture blending. There are a bunch of tricks to solve blurry textures when closeup vs. far away, for example see https://docs.unrealengine.com/udk/Three/TerrainAdvancedTextures.html#Multi-UV Mixing: Reducing tiling through scalar mixing

NAIMA · Jan 2021

Eric Chadwick said:

Also, why are you using such an absurdly high resolution?

Instead you could use tiling textures and texture blending. There are a bunch of tricks to solve blurry textures when closeup vs. far away, for example see https://docs.unrealengine.com/udk/Three/TerrainAdvancedTextures.html#Multi-UV Mixing: Reducing tiling through scalar mixing

Because the program I am using to visualize doesn't offer those features.

Eric Chadwick · Jan 2021

Which program? Why did you choose to use it?

NAIMA · Jan 2021

Secondlife , it doesnt allow for advanced features.

I do not understand though the usage of clamp and when should be applied?

Eric Chadwick · Jan 2021

With tiling UVs, when your texture is mapped 1:1 across the model, the texture is still tiling beyond the edges. When the textures are filtered you'll see a little bit of the opposite side being blended into the pixels that are right on the UV border.

UV Clamp smears the pixel colors along edge of the UV square, instead of tiling the texture. So when the texture is filtered, it is only "seeing" the edge pixels, not the tiled pixels from the other side of the texture.

Eric Chadwick · Jan 2021

Here's an older method that might help your seams:
http://wiki.polycount.com/wiki/CubeMap#Cubemap_Seams

Eric Chadwick · Jan 2021

Here's a visual example from a game I worked on for the Nintendo Wii, we padded the colors around each texture, then shrunk the UVs a bit.

Image: https://us.v-cdn.net/5021068/uploads/editor/zb/w2awjni6qyk1.jpg

NAIMA · Jan 2021

Eric Chadwick said:

With tiling UVs, when your texture is mapped 1:1 across the model, the texture is still tiling beyond the edges. When the textures are filtered you'll see a little bit of the opposite side being blended into the pixels that are right on the UV border.

UV Clamp smears the pixel colors along edge of the UV square, instead of tiling the texture. So when the texture is filtered, it is only "seeing" the edge pixels, not the tiled pixels from the other side of the texture.

Still not sure I understood, but The idea I had was to apply a different ID to each face with a specific texture material this is what I did in another model in the past, now I am having a problem couse I went into a different workflow that includes substance painter, while before I was using mudbox, I got fine tiles and seams with mudbox but with UDIM and substance I am having problems even with the UVs.

I am not sure if I understand it can depend on this tiling ?

How can I tile with precision mappig?

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