Question about converting to virtual texture

Development Rendering
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1

Hello, I have two questions regarding Virtual Textures (VT):

  1. I understand that, unlike regular texture streaming, VT requires two sampling steps—one for the indirection texture and another for the physical texture. If I have a 128x128 texture (assuming a tile size of 128), there would be no actual memory savings, but sampling would still occur twice. Additionally, I assume that efficiency would differ depending on the compression format, such as G8 versus HDR. Are there any guidelines for VT conversion based on texture size or format?

  2. I noticed that tiling is done in powers of two. What happens if the texture itself is not a power of two? Additionally, while unrelated, is there any issue with using non-power-of-two textures?

2

Hello there @hurjm!

For point 1, all guidelines related to virtual texturing can be found in the following documentation:

As for point 2, virtual texture dimensions must be a power of 2, but UE does not require them to be square by nature.