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This question already has an answer here:

I have subdivided a plane into 50 x 50 faces, then I random selected some of those faces and saved them as a group, I hid them with h and random selected among the other faces and made them another group.

I repeated this a couple of time, so that I had one objected which contained several groups of faces.

From this point on, I tried to select one group and assign to them one material and to another group another material and so on...basically to achieve a floor of tiles with different kind of tiles.

But, it did not work.

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marked as duplicate by cegaton, Duarte Farrajota Ramos, David Jun 11 '17 at 22:50

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  • $\begingroup$ What didn't work? $\endgroup$ – Mr Zak Jun 11 '17 at 20:08
  • $\begingroup$ when I selected the vertex group and assigned a material only to the selected faces, not the faces changed but the whole object $\endgroup$ – sharkant Jun 11 '17 at 20:10
  • $\begingroup$ How many materials there are available? Were you assigning faces to the vertex group? Keep in mind that faces won't be assigned if you just selected them with vertex group choosed in the list. Please show some screenshots of how were you assigning and what was the result. $\endgroup$ – Mr Zak Jun 11 '17 at 20:13
  • $\begingroup$ This answer can be adjusted to assign random materials to faces. $\endgroup$ – sambler Jun 12 '17 at 4:38
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  1. Click "+" to add a new material slot
  2. Set the material
  3. Select the desired face(s) and make sure the added slot is selected
  4. Click "Assign" button

You should see it in the viewport (solid) now enter image description here

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