Atlas Creation
From Sprites
Let Unity assemble the single images for you into a sprite. You can then use the sprite converter to convert the sprite to an atlas.
1. Create a new atlas object by right-clicking within the project view "Create > Easy Decal > Texture Atlas"
2. Select the atlas object and assign a material with at least the base color texture assigned.
3. Click on the "From Sprites" button.
4. Assign all sprites by dragging them to the sprites slot.