I tried 3 methods: A) Taking the existing white solid and stretching it to fit the existing composition size. B) Creating a new white solid and copying the attributes and effects to it. 3) from the unaltered original file at 640 x 391, rendering at 2560 x 1600.
For my latest video, I just did the third option, but I’m not sure how good the quality is that way…
I like editing, but in this case the original was just the way I like it, so I’d rather not re-do the whole thing if it’s avoidable. The problem obviously relates to the 3D nature of CC Particle World, but I don’t know exactly what’s causing the issues when bumping it up to 2560 x 1600. The camera perhaps?
Here is the original project: https://www.box.net/s/6qaxc4qybm1znuvqnlxc