Stack Trims - Substance 3d Designer utility node

This is a utility node for Substance 3d Designer that helps to organize and make changes to trim sheets easier. Using trim height maps and masks it stacks trims automatically. Thus to change individual trim height you only need to change height of it's mask and won’t need to change lots of 2d Transforms to move trim into place again.
Demo video is available here: https://www.artstation.com/artwork/LReQYA

The package includes both grayscale and color versions.
The node works for square and non square trim sheets as long as the shape masks are centered and take up full width.

How it works (for "Top to bottom" stacking mode):

1. It masks out the very top part of a new trim using the provided rectangular mask.
2. It examines the “Trim sheet mask” input and finds the position right under the mask.
3. It moves the new trim to that position.
4. It outputs a new combined height map and a mask for it, as well as a mask for a new trim.

For "Bottom to top" mode it works the same, but the very bottom part of a trim is masked in the first step.

Settings:

• Stacking mode:
  • Top to bottom - top part of trims will be masked and trims will be stacked from top to bottom.
  • Bottom to top - bottom part of trims will be masked and trims will be stacked from bottom to top.
• Is trim mask centered - use True if your trim mask is centered (this is by default). Use False if it is already at the top or bottom (e.g when using StackTrims output mask as an input for another StackTrims node).

Inputs:

• Trim sheet height (optional) - height map of the trim sheet part
• Trim sheet mask (optional) - mask for the trim sheet part
• Trim height - height map of new trim that should be added to the trim sheet
• Trim mask - mask for the new trim. Should be either centered or placed at the very top

Outputs:

• Height - combined height of provided trim sheet and a positioned new trim
• Mask - combined masks of trim sheet and positioned new trim
• Trim mask - mask for a new trim that is now correctly positioned

Tested only in Substance 3d Designer v.11.3 (November 2021) but I believe it will work in the newer versions too :)

• Improved support for non-square trim sheets.
• Added "How to use it" info image