My animation I used for the sprite sheet is 9 frames long and 128x128, but if I used a 3x3 grid it would be 384x384, which is not a power of two, so I am using 512x512, which is a 4x4 grid for the 128x128 images, would this be ok to use the 512x512 or not?
1 Like
That sounds right! You would fill the first two rows and then the first space in the third row, leaving 7 128x128 blocks empty. 
Think of it like this: find the smallest power of two that gives you all your frames (ie 9).
Since you have 9 frames, we have
- 1
- 2
- 4
- 8
- 16
- 32
- 64
- … etc
so the smallest power of two that works is 16, so you need a grid that is Nx128-pixels wide and Mx128 pixels high, such than NxM = 16. (The neatest choice for N and M is 4 and 4.)
If you wanted to make 20 frames/sprites, you would need 32-grid-blocks, with the last 12 (32-20) regions going to be left empty. Then solve Nx128 and Mx128 such that NxM=32. And here a neat choice would be N=8, M=4 (you want N and M to be powers of two as close to each other as possible).
Thanks for the clarification, Ken, and Gregory!