Are there any BP nodes that can help identify and spawn actors on the brightest sections of a perlin noise image?

[midgunner66]

There’s an importance sampling node:

Distribution mask on a spawner

You can use Make Importance Texture | Unreal Engine Documentation and Importance Sample | Unreal Engine Documentation to do that. An explanation of those can be found here: Unreal Engine 4.17 Release Notes | Unreal Engine Documentation.

But that does random sampling and is more sampling & distributing than accurately finding “each remaining cloud or blob.”

If speed isn’t an important factor, you can use Read Render Target Raw Pixel | Unreal Engine Documentation to read each pixel of the texture.
Edit: just read the importance sampling node is slow, too.