title: build a tiled big texture from other textures
body: <p>I am making a unity 2D RTS game and I thought of using a big texture for the tiled map (instead of a lot of textures - for the memory reasons...).</p>
  
  <p>The tiled map is supposed to generate randomly at runtime so I don't want to save a texture and upload it. I want the map to be generated and then build it from a set of textures resources.</p>
  
  <p>so, I have a little tiles textures of grass/forest/hills etc. and after I generate the map randomly, I need to draw those little textures on my big map texture so I will use it as my map.</p>
  
  <ol>
  <li>How can I draw a texture from my resources on other texture? I saw there is only a Get/SetPixel functions... so I can use it to copy all the pixels one by one to the big texture, but there is something easier?</li>
  <li>Is my solution for the map is OK? (is it better from just create a lot of texture tiles side by side? There is other better solution?)</li>
  </ol>