Why did this height connection turn into a red dashed line?

Question

Hi. Very new to Substance and appreciate your patience. I'm trying to understand:

A. What may have caused this height connection to break, and
B. How do I fiix it?

My .sbs has two subgraphs within it. I was working in graph 2, and then when I returned to graph 1 (see screencap), the previously-functional height connection was now a red dashed line and the material in my 3D view was no longer displaying height data. I see that I have a yellow-to-grey-dot situation but I'm still unclear as to how this happened and how to resolve it. I cycled through the Link Creation modes to no avail.

This issue doesn't seem to be disucssed in the Youtube comments and my searches are hitting dead ends hence my posting here. Hope this is okay!

K

kaitlins81707393 · Accepted Answer

Updating my above post. Not sure what I did wrong but I resolved it after just reverting to an earlier save state and redoing the work. Attributing the issue to being new and prone to noob errors.

davescm · Answer

The red dashed line shows that you have connected an output to an incompatible input. In this case a colour output (shown by the orange connector on the blend node) to a greyscale input (grey connector on the BaseMaterial node .

Dave

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