What is wrong with this script?

[Pixero]

I got inspired by a thread here about shadow threshold and thought I'd try it, but I get an error: #<ArgumentError: comparison of Float with Array failed>
What am I doing wrong?

#  Name ; JS Shadow Threshold
#  Description ; Sets cast shadow with a threshold
#  Author ; Jan Sandstrom (http://www.pixero.com)
#  Date ; 12 Aug 2007

require 'sketchup.rb'

def jsShadowThreshold

  model = Sketchup.active_model 
  entities = model.active_entities
  ss = model.selection


  if ss.empty? 
    UI.messagebox("Nothing selected!")
    return nil
  end 
  
  # Dialog
	@thresh = 0.7 if not @thresh
	prompts = ["Shadow threshold; "]
	values = [@thresh]
	results = inputbox(prompts, values, "Shadow threshold")
	thresh = results
	@thresh = thresh
	
	ss.each {|e| 
		next if not (e.is_a? Sketchup;;Face)   #Ignore items in the selection that are not faces. 

		alpha = e.material.alpha
		
		if (alpha < thresh) #Error; #<ArgumentError; comparison of Float with Array failed>
			e.cast_shadows= false
		else
			e.cast_shadows= true
		end #if
				
	} #end of ss.each 	
end #jsShadowThreshold

if( not file_loaded?("jsShadowThreshold.rb") )
    UI.menu("Plugins").add_separator
    UI.menu("Plugins").add_item("JS Shadow Threshold") { jsShadowThreshold  }
end

file_loaded("jsShadowThreshold.rb")

[todd burch]

results, as returned from inputbox, is an array.

Todd

[TIG]

thresh=results[0]

will work...

[Pixero]

Thanks, but now another error has occured.
For the following line:

alpha = e.material.alpha   #Error; #<NoMethodError; undefined method `alpha' for nil;NilClass>

Sorry if it's elementary but I can't seem to get it right.

Thanks in advance.
/Jan

[todd burch]

e is most likely valid. When e does not have a material assigned, the .material method returns nil.

Todd

[Pixero]

Ok, progressing veeery slowly....
When I assign a material to the faces I now get this:

e.cast_shadows= false   #Error; #<NoMethodError; undefined method `cast_shadows=' for #<Sketchup;;Face;0x7532bb0>>

If I remove the e in front of cast_shadows I don't get the error but nothing happens.

Sigh...

[todd burch]

The doc is bad. Use .casts_shadows=.

To see the methods a entities allows, in the Ruby Console, enter (for example, with a face)

(face.methods - Object.methods).sort.join("\n")

Todd

[Pixero]

Thanks that did it!
Now if only I can get it to work with grouped objects...

[Pixero]

Got it working! Thanks for the help. Read more here:
http://www.sketchucation.com/scf/viewtopic.php?f=9&t=1986