Architectural_Design_with_SketchUp

Architectural Design with SketchUp
# Define all possible translations
t1 = Geom::Transformation.new([100,0,0])
t2 = Geom::Transformation.translation([100,0,0])
t3 = Geom::Transformation.rotation(center, [1,0,0], 45.degrees)
t4 = Geom::Transformation.scaling(center, 2)
# Choose one of them—for now
t = t2
# Transform one object
ent.transform_entities(t, sel[0])
You can test the main transformations simply by modifying the t = t2 statement. Feel
free to experiment with the code a bit to test it out.
If you want to apply more than one transformation, then replace this line with something
like t = t2 * t3 * t4 (i.e., multiply the ones you want to apply). This combines t2, t3, and
t4 into a single transformation.
The following examples apply these principles in various ways.
Lots of Boxes Using Components
This is essentially the same example that we did earlier. In SketchUp, however, the approach
that takes less computational effort and less space on the hard disk than just creating lots of
geometry is usually to create one geometry item (the box, in this case), convert it to a component,
and then just insert component instances. Instead of saving a whole lot of geometry,
only insertion points are thus being stored. This results in smaller file sizes and models that
handle much better (during zooming, orbiting, etc.).
The following code does this by creating a grouped box, converting it into a component,
and then copying (placing) it multiple times using transformations.
# Creates lots of boxes using components
ent = Sketchup.active_model.entities
s = 100
w = 10
n = 10
group = ent.add_group
face = group.entities.add_face [0,0,0],[w,0,0],[w,w,0],[0,w,0]
face.pushpull -w
comp = group.to_component
260
(0..n).each { |i|
(0..n).each { |j|
(0..n).each { |k|