The plugin can be downloaded here: https://sourceforge.net/projects/mpoutils/ as the zip file. Must be compiled and installed. The jpeg files saved inside mpo file are compressed with 90% quality. This should be sufficient for 3D images. If not, let me know.
tileimages.scm -- Put n*m same sized images onto one image in n columns & m rows with optional padding, grid lines, bounding box, rounded corners and feathered edge.
If there aren't n*m images passed, the last image is repeated until n*m positions are filled.
This is useful for just passing one image, which will be tiled for all n*m positions.
If there are more images passed, only the first n*m are used.
Revisiting the concept of creating and using Luminosity Masks in GIMP. This script-fu will generate a full set of Light, Dark, and Midtone masks as channels for your image (based on the work of Tony Kuyper originally).
GC Shadow V1.2 is an enhanced replacement for GIMP’s Drop Shadow procedure. It supports Solid Color & Gradient Drop Shadow, Glow, Inner Shadow & Inner Glow. Compatible with GIMP 2.6.x & GIMP 2.8.x. For Script-Fu coders, this procedure allows the passing of the Shadow Layer Name as an argument.