How to Select face by attribute (vertex color) and Using mask color by color in Sculpt mode

Support Materials and Textures
1

Hello, I’m currently looking into how to use attribute (vertex color) to select vertex or faces.

My ultimate goal is to find out the number of faces and vertex in an area I have selected. (It doesn’t have to be 100% accurate because of the color boundaries.)

Objects are divided by color like an ID map, and I want to select only the area for that color.

Below is the test file.

  1. I applied Texture image to Attribute (Vertex color) by Bake.

image
image1603×845 307 KB

  1. I was able to select by color using mask color by color in Sculpt mode.

mask by color_hide

  1. I pressed H to hide with only the red part selected, but both the red and yellow disappeared at the same time.

image
image1865×1085 256 KB

  1. I think it’s a problem with the Face sets, but I don’t know the exact reason.

  2. If they are hidden or selected exactly by color, I think I can check the number of Faces and Vertices in Edit mode.

image

Any advice on my method or how to select Faces by color?

2

There is a setting in the N-panel, where you can set the color treshold. I guess your’s was to high, as yellow and red are closer together on the rgb spectrum

image

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3

Thanks for reply!

As you can see in the gif file below, only the selection by color is successfully.

mask by color_1

However, both colors are hidden together.

image
image1522×1026 107 KB

When hiding, there is an option called Face sets visilblity as shown in the picture below. Is this related?

5

did you create a faceset from the mask?
image

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6

image
image693×667 35.6 KB

When I create Face set from Masked, only the desired area was hidden.
This is my first time using this function. I wonder how it works.
I’ll have to look it up. Thank you.

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7

If you are going to look into face sets you might want to install this add on too:

It’s pretty neat. You can convert facesets into other attributes with it. (so kind of the other way around) And the author is on the forum as well, I think.

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