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Masking a tile pattern for the Tile Sampler Color node.

New Here ,
Sep 13, 2022 Sep 13, 2022

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I've got some clumps of grass that I'm putting into some Tile Samplers to make distributions of them. Grayscale clumps go into a Tile Sampler, and color versions go into a Tile Sampler Color with the same settings. The problem is that the color patterns stamp on top of each other as square tiles, while the grayscale clumps act as if they have alpha information (or mix together as if they're all an Add blend). A couple images are attached to show what I mean.

 

I'm looking for a way to mask individual pattern inputs for the Tile Sampler Color. Anyone have any ideas?

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New Here ,
Sep 13, 2022 Sep 13, 2022

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Found what might be the only solution. Add/Sub blend mode instead of alpha blend in the Color section.

Don't love the blend, wish it could look like a Copy with alpha masking instead, but it'll do for now.

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New Here ,
Sep 13, 2022 Sep 13, 2022

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Couldn't get over the blend, I'm now just doing multiple Tile Samplers for each different clump, with fewer tiles showing, and with a random seed that avoids all overlap.

 

Kind of annoying workaround.

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Community Expert ,
Sep 13, 2022 Sep 13, 2022

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Have you ensured your color pattern input has an alpha (use alpha merge node as below if it does not)

2022-09-13_22-17-16.jpg

 

Dave

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New Here ,
Sep 14, 2022 Sep 14, 2022

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I have multiple patterns going in, and don't see that it permits multiple alphas.

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Community Expert ,
Sep 14, 2022 Sep 14, 2022

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Hi

Still works here, unless I'm missing what you are aiming to achieve.

 

2022-09-14_20-14-56.jpg

 

Dave

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New Here ,
Sep 19, 2022 Sep 19, 2022

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Alpha merge only works with color nodes. I'm using grayscales, and different patterns for different output nodes, like for normalmaps.

I'll see if doing color/grayscale conversions before and after the tile sampler can be made to work.

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