The resolution multiplier will multiply the settings you entered into the “New Window Size” in the Editor Preferences. So if you entered 512x512 , a multiplier of 2 would result in a 1024x1024 texture size. A multiplier of 4 would result in a 2048x2048 texture size. Depending on the desired results, you may want to render textures as high as 4096 or 8192 in order to downsample them in Adobe Photoshop. In those cases it is usually suggested that you add a post process volume and set the Anti Aliasing setting to “none” to get a more crisp result.
- Render a Tiling material to textures
Note: In UE4.3, this particular function is missing the setting to specify the material target. This is easily worked around by placing the following mesh at 0,0,0 in the world, and setting the Scale to match the number specified in “Sheet Size” on the Blueprint (Defaults to 1000):
StaticMesh’/Engine/ArtTools/RenderToTexture/Meshes/S_1_Unit_Plane.S_1_Unit_Plane’
Then simply apply the desired material and it will work.
You must also enable the ability to export buffer visualization targets in the editor. That can be found by clicking the upper-left Down-Arrow button in the perspective viewport and selecting “High Resolution Screenshot”

That will bring up a small window of the same name. You must check the box named “Include Buffer Visualization Targets”

You must actually leave this window up. It is ok to just click anywhere on the editor again, this window will move behind the editor and should not interfere. If you accidentally close the window, the buffer images will not render. You will need this box checked and the window open for all of the render functions as well.
Now the only remaining step is to Play the game in a new Window, press ~ or tab to bring up the console and type “rendertextures” and hit enter.
You should get a popup message indicating that images were saved, the message is actually a clickable link to the folder location. If you are not able to click the link in time, you can find the saved textures here:
\YourProject\ Saved\Screenshots\Windows\