Isometric Tiles not conforming to Isometric Grid

[Gravano]

Hi, I’m having a frustrating time trying to get isometric tiles to work correctly for me. I have downloaded several isometric tilesets from OpenGameArt.org, as well as some Unity assets that were made available for free. Somehow, the Tile Palette that is already setup by Unity has a perfect conformance to each 1x1 diamond, and that includes any that I add from the OpenGameArt tiles. Now, when I go to create a new palette and set it as Isometric, everything breaks down and any tiles that I add take up approximately a 2x2 grid space.

Here are some pictures that hopefully explain what I mean. The first picture is the one with a tile palette setup by Unity. It’s perfect.

Next, I add some of the Unity tiles & a few OpenGameArt tiles. Although the latter seem a bit skewed, they still fit the 1x1 area. Note I added four tiles each.

I go to create my own palette using these settings, although I have experimented with others such as Automatic or Isometric Z as Y. Nothing works.

This is the end result. Once again, I added four tiles, but here they take up a 3x3 area. I also added a single tile which takes up a 2x2 area. Please help fix this abomination.

[Valjuin]

The following is a quote from Unity Blog Isometric 2D Environments with Tilemap
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A note on importing assets
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You might be unsure about the correct import settings and tilemap size that will work for your assets. There is a general rule that you can follow here based on your initial asset dimensions. First, take a look at the resolution of your tiles. Typically, isometric tiles that are represented as a block are taller than they are wide; ‘flat’ tiles (ones that appear as a plane rather than a cube) are wider than they are tall. However, the width will always be the same between them. Therefore, if you want your tiles to take up exactly one Unity unit, set the Pixels Per Unit value in the tile import settings equal to their width in pixels. You may want to adjust this value in some cases – usually by decreasing it (or increasing the actual resolution of your assets); this could be useful if you are trying to produce an effect where some tiles appear to take up more than one grid cell and overlay the neighboring tiles.