Sketcher relations Syntax

[braynpower]

G'day all,

Does anyone have any know-how they'd be willing to impart with in terms of using the IF function in Sketcher?

I have a line that has its base dictated by a relation, and its angle dictated by another relation. The problem arises when in certain instances, the angular constraint creates a zero length line (or negative length...), or sometimes the base relation does the same. This line is used to create a surface that is then merged and has all manner of other torture committed afterwards... so when it fails, well lets just say its a bit of a PITA.

I'm thinking I might be able to rig something with the IF function, and then failing that, I could try work out a way of getting Pro/Program to choose a surface/merge instead...

If anyone could help with providing basic syntax like "IF (FeatID:XXX <=1, THEN...)" for the minute I have no idea even how to write it, and unless I'm mistaken, there isn't a simple write up of the options anywhere...

And if someone has a really smart way of doing this that means I don't need to do any of this.. well that'd be cool too...

I've attached some super clear sketch goodness...

Cheers!

Bryan.

 

[braynpower]

so, seems the syntax is pretty similar to excel


sd0 = if(TEST <> 6, 5, 10)

TEST is naturally a parameter
<> means is not equal (if you've played around with Pro/Program you'll know this)

so if TEST = 7, sd0 will be 5
if TEST = 6, sd0 will be 10

so the fun is then playing around with this in incremental pattern updating memb_i etc...

I have yet to try any of the other functions, but I might have a hack at it soon.

 

[dr_gallup]

Just and FYI on using sketch relations, these can frequently require a second regen to fully update. Sometimes you have to use them but most of the time you can make part relations that will not require the second regen.