I am trying to set a transformation object to the identity matrix but I am unable to access the 16 element array. If I try to inspect the values with a call to trans.to_a the value returned is an empty array. trans = Geom::Transformation.scaling(1,1,1) or arr = [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1] …

Also not what I get. Something is funky in your setup, though maybe it is calling the methods with the wrong arguments? > t=Geom::Transformation.new #<Geom::Transformation:0x007fbd5e272ef0> > t.to_a [1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0] > t2=Geom::Transfo…

I remember a bug having to do with SketchUp’s idea of whether a transform was identity or not. There was some operation which caused an identity transform to “lose” it’s identity. (pun intended, but yes there was a bug. Don’t know if it got fixed.) ADD: Okay, I remember now. Using Steve’s 3rd exam…

[image] AlanMatthews: I am trying to set a transformation object to the identity matrix but I am unable to access the 16 element array. Why would you even want to do it? Geom::Transformation::new creates a new identity transform. (Ie, no arguments) t = Geom::Transformation::new t.identity?…

[image] DanRathbun: Reason is apparently the Geom::Transformation class does not provide an overridden == method so “sameness” can be properly calculated. (It defaults to Object#==.) This appears to be true. Transformation’s == does not compare the values in the Transformations, just the ide…

You’d be surprised Dan. If you’re dealing with a function that you wish to operate on either a component instance or a group the component will require transforming whereas the group will not. It is just one way of avoiding lots of if blocks as transforming a group with an identity transform will l…

Further to my post I should report that the issue appears to be one of visibility. This is consistant with my earlier observation regarding correctly constructed transforms. If I write a simple test utility (see below) the visibility works fine. require 'sketchup.rb' class TTest def initializ…

<a name="p-134348-hooray-ive-found-it-the-problem-was-the-use-of-in-a-conditional-test-instead-of-this-is-a-nasty-syntactical-error-since-unlike-embarcadero-pascal-the-code-interperator-doesnt-give-the-coder-warning-and-it-can-be-a-hard-one-to-detect-i-think-this-might-be-one-for-the-wish-list-unless-there-is-a-legitimate-use-of-an-if-combination-the-following-shows-the-error-1" class="anchor" href="#p-134348-hooray-ive-found-it-the-problem-was-the-use-of-in-a-conditional-test-instead-of-this-is-a-nasty-syntactical-error-since-unlike-embarcadero-pascal-the-code-interperator-doesnt-give-the-coder-warning-and-it-can-be-a-hard-one-to-detect-i-think-this-might-be-one-for-the-wish-list-unless-there-is-a-legitimate-use-of-an-if-combination-the-following-shows-the-error-1" aria-label="Heading link"> Hooray! I’ve found it. The problem was the use of = in a conditional test instead of ==. This is a nasty syntactical error since, unlike Embarcadero pascal, the code interperator doesn’t give the coder warning and it can be a hard one to detect. I think this might be one for the wish list unless th…

I am glad you found it. It is an easy and common mistake to make. However, it should have generated a warning in the ruby console which would have pointed you to the location of the error.

@AlanMatthews Would you please edit your prior posts, and wrap your code in the forum markdown code delimiters, ie: ```ruby code here ``` Those are backticks, the character that shares the key with the tilde (~) to the left of the 1 key. (You’ll likely need to re-indent the code as the forum has…

Transform array

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jim_foltz January 22, 2017, 5:31pm 2

No idea @AlanMatthews. Could the to_a method have been redefined somehow?

p IDENTITY # => #<Geom::Transformation:0x0001d653b3eec8>
p IDENTITY.to_a # => [1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0]

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Transform array

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