Incorrect "node_stack_top" to some parts?

[Xavier513]

Imagine  a vessel with two parts, partA at the top, partB at the bottom.

In the ".craft" file, then we have something like:

PART
{
	part = partA
	pos = 0,15,0
	attPos0 = 0,15,0
}
PART
{
	part = partB
	pos = 0,15-(partA.node_stack_bottom + partB.node_stack_top),0
	attPos0 = 0,partA.node_stack_bottom + partB.node_stack_top,0
}

Notice that, in most cases, partB.attPos0.Y == partA.node_stack_bottom + partB.node_stack_top

However, this is not true to "liquidEngine"(aka "LV-T30"), "liquidEngine2"(aka "LV-T45") and "science_module"(aka "MaterialBay").

According to "liquidEngineLV-T30.cfg", "node_stack_top" to "liquidEngine" is 0.721461, but after some testing, I think the correct value should be 0.901825905.

I'm writing a tool using "node_stack_top" properties, so I'd like to know why it acts like this? Or did I miss something?

Edited May 29, 2020 by Xavier513

[Rhomphaia]

My guess

Those 2 engines have been in the game a long time, back when the size 1 was 1m diameter. 

1.25 is pretty close to the ratio you expect.

all the parts you list have the line "scale=0.1" as do the Deprecated versions of the FueltankT200, 400 & 800, but not the 100

[Xavier513]

56 minutes ago, Rhomphaia said:

 1.25 is pretty close to the ratio you expect.

That must be it! I think you are right! Thanks!

[Vanamonde]

As this does not appear to be a suggestion, the thread has been moved to the techie subforum.