Ruby get slope of a surface

ordoumpozanis

Hi all,
I am new to Ruby and I' like so help. I am trying to write a code that gives the slope (angle between the blue line and and the the face normal) of a roof but i cannot get it work

I am using this code but does not work

norm.angle_between
slope = norm.angle_between(Geom::Vector3d.new(0,0,1)).radians

any help ?

thanks

Aerilius

Hi, it's simple:
"it doesn't work" = "it doesn't do what I expected"
Then what do you expect?

Your example worked with that face:

face = Sketchup.active_model.entities.add_face(ORIGIN, [0,1,0],[1,1,1],[1,0,1]).reverse
slope = face.normal.angle_between(Z_AXIS).radians
>> 45.0

Please make test cases (and define for each an expected result), then test each and then you either correct the code or the test case.

ordoumpozanis

Aerillus Thanks for the reply

If I understant well at the first line you design a surfae and at the second one you get the slope..

when I am trying to apply the second commant
slope = face.normal.angle_between(Z_AXIS).radians
on a design face i get a nill value

what do I make Wrong here ?

Chris Fullmer

Give us the full code then, instead of the snippet you provided. If your code isn't working, then it might have something to do with how you are retrieving the face object. Are you sure you're actually referencing a face for example?

thomthom

Code and sample model.

Whenever I get unexpected result I ensure I inspect the values of the variables I use - to make they they contain the values I expect them to be. Often the error can be in another place.

ordoumpozanis

The code that i am trying to apply to get the slope of a model's surfaces is the following

<span class="syntaxdefault">&nbsp;&nbsp;model</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model<br />&nbsp;&nbsp;ss</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">selection<br />&nbsp;&nbsp;faces</span><span class="syntaxkeyword">=[];&nbsp;</span><span class="syntaxdefault">ss</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">|</span><span class="syntaxdefault">faces&nbsp;</span><span class="syntaxkeyword"><<&nbsp;</span><span class="syntaxdefault">e&nbsp;</span><span class="syntaxkeyword">if&nbsp;</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.class==</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Face</span><span class="syntaxkeyword">}&nbsp;<br />&nbsp;&nbsp;<br />&nbsp;&nbsp;</span><span class="syntaxdefault">faces</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">face</span><span class="syntaxkeyword">|<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">name</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">face</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">to_s</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">split</span><span class="syntaxkeyword">(</span><span class="syntaxstring">";"</span><span class="syntaxkeyword">)[-</span><span class="syntaxdefault">1</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">split</span><span class="syntaxkeyword">(</span><span class="syntaxstring">">"</span><span class="syntaxkeyword">)[</span><span class="syntaxdefault">0</span><span class="syntaxkeyword">]<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">norm</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">face</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">normal<br />&nbsp;&nbsp;&nbsp;&nbsp;slope&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">face</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">normal</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">angle_between</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">Z_AXIS</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">radians<br />&nbsp;&nbsp;&nbsp;&nbsp;puts&nbsp;slope<br />&nbsp;&nbsp;</span><span class="syntaxkeyword">}&nbsp;</span><span class="syntaxdefault"></span>

ok i now i have program somthing wrong but i cannot find out what

thomthom

Can you also post a model with a face where the result is incorrect? (Please also describe what is expected value.)

Dan Rathbun

Are you still using SketchUp 6 Pro ?

There was a bug in the Geom::Vector3d#angle_between() method that was fixed sometime in the 7.x branch.