A big thank you. This plugin will be saving me hours and hours of work!

	if (Sketchup.active_model.selection[0].typename == "Group" or Sketchup.active_model.selection[0].typename == "ComponentDefinition")
			menu.add_separator
			menu.add_item("Beam Analyser") {
	                b = Beam.new
			b.bbox
			b.prompts
.
.
.
.
.
.

def bbox 
		@beam = Sketchup.active_model.selection[0]
		bbox = @beam.bounds
		point1 = bbox.max
		point2 = bbox.min
		b = (point1[0] - point2[0]).abs.to_mm.to_i
		length = (point1[1] - point2[1]).abs.to_mm.to_i
		h = (point1[2] - point2[2]).abs.to_mm.to_i	
end	

does this make it more clear? If I choose a group, there is not problem. But if I choose a componentinstance, The attributes are applied without any problems. Unfortunately its not being applied to @beam.

what exactly is a component definition?

@beam = Sketchup.active_model.selection[0] bbox = @beam.bounds point1 = bbox.max point2 = bbox.min b = (point1[0] - point2[0]).abs.to_mm.to_i length = (point1[1] - point2[1]).abs.to_mm.to_i h = (point1[2] - point2[2]).abs.to_mm.to_i @beam.set_attribute "Beam Information", "1. Type of Concrete", "#{@cstrength}"

Ok one problem now, I have selected active_model as either ComponentInstance or Group. When its a group I can apply the attributes with no problem! But when its a component I am not able to add the information. Is there a way I can add all this information to it? and Is there a way to apply the same attributes to all the ComponentInstances in the active_model?

Ahh there is my mistake! I love finding mistakes..

I thought group is a method and not a variable!

here is the code i think its fine..

def draw_beam
		
		model = Sketchup.active_model
		entities = model.entities
		group = entities.add_group
		entities = group.entities
	
			pt = []
			pt[0] = [0, 0, 0]
			pt[1] = [@b, 0, 0]
			pt[2] = [@b, 0, @h]
			pt[3] = [0, 0, @h]
	   
		c_section = entities.add_face pt
		 
		@length = -@length if( c_section.normal.dot(Y_AXIS) < 0 )
		
		c_section.pushpull @length

	entity1 = entities[1]
	status = entity1.set_attribute "Dimensions", "Length", "#{@h} mm"
	status = entity1.set_attribute "Dimensions", "Width", "#{@b} mm"
	status = entity1.set_attribute "Dimensions", "Effective Length", "#{@d} mm"
    end

I think the different entities are stored in an array format right? I copied the exact thing from the Google API.
[url]
http://code.google.com/apis/sketchup/docs/ourdoc/entity.html#set_attribute[/url]

Yes it all goes well without any errors to debug. But When I right-click and click 'Show Attributes' there is nothing there but this in the dialog box:::

%(#8080FF)[**Add Category...

You can create/delete categories of Attributes and add/edit and delete individual attributes within a category.
To get started, click on the Add Category... link above.

Tip: You can create standard categories by clicking here.

Add an attribute Delete Category Cancel Accept**]

Is there another way of access the attributes I applied? And say I save this box, will the attributes be saved too?

I am sorry about that, With so many plugins installed, I lost track of what is really sketchup and what is the plugin. Let me rephrase:::

Say I create a box, with the help of a plugin and group it. I want to be able to see information about the group, by selecting 'Show attributes'. But I want the attributes to be made automatic. i.e. I want see, that it is a box, it has height h, width w, etc. How can I do this?

entity1 = entities[0] status = entity1.set_attribute "Dimensions", "Length", "#{@h} mm" status = entity1.set_attribute "Dimensions", "Width", "#{@b} mm" status = entity1.set_attribute "Dimensions", "Effective Length", "#{@d} mm"

Hi I have an entity which is a beam. It has the dimensions @h, @b and @d. How Can I make it appear onto my group when I right-click and click show attributes.

I don't have pro, but I use at the university. does having the free version have anything to do with why its not working?