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The Aperture node expands or compacts every single feature on the terrain, similar to bokeh in a camera.

Node Properties
MethodChoose whether to expand or compact the visuals on the terrain.
Expand : Expands the pixels.
Contract : Contracts the pixels.
IterationsNumber of aperture passes to perform on the terrain. Higher number of passes creates a pronounced effect at the expense of speed.
KernelKernel is the shape of the aperture. Changing the kernel can change how the features on the terrain are modified.
Disk : Large, circular formation.
Diamond : Small, diagonal squares.
Cross : Small cross pattern. Can create predictable shape. For best results, use with masking.
Oct : Large, octagonal formation.
Corner : Large, diagonal squares.
Ring : Small, circular formation with steps/terraces.
Sobel : Rectangular stretches which retain corner shapes.
RandomWhen on, each iteration uses a randomly selected kernel.
SeedThe randomization pattern or seed for the node's process.

Enable Parallel ProcessingEnable multi-CPU processing of the effect.
Chunk SizeThe chunk size into which the image is divided for processing.
Edge BlendingThe percentage of blending between the edges of neighboring chunks. Higher values require more memory and processing time.

If you see grid-like artifacts in your output, use higher values for Edge Blending. If that does not help, try increasing Chunk Size. If either does not help, you can disable Parallel Processing. This may result in slower builds, but the result will be accurate and error free.