View.refresh behavior

[mptak]

mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
view = mod.active_view
tran1a=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]
tran1=Geom;;Transformation.new(tran1a)
tran2a=[5200,0,0,0,0,75,0,0,0,0,1,0,0,0,0,1]
tran2=Geom;;Transformation.new(tran2a)
for i in 1..100 do
    tr=Geom;;Transformation.interpolate(tran1,tran2,i*0.01)
    ent[0].transformation=tr
    newview=view.refresh
    sleep 0.01
    puts i
end

This does not seem to refresh the screen with every view.refresh. Any suggestions/explanations?
(for this application the intent is to growing a unit cube(the first entity) which I intended to iterate in 100 steps.

[Anton_S]

There are two things happening here:

1. The view is redrawn every time you assign transformation to the object via the ent.transformation= function; Use ent.move! new_tra instead if you want to use view.refresh function as the only function for redrawing the view.
2. Your timestep is a little too small. From my experiences on my PC, I figured min refresh delay is 1/64, which is ~0.016 seconds, while your refresh delay is 1/100 (0.01). That's why your view is not always refreshed I suppose. I got 1/64 from calculating timestep in view animation nextFrame function. I think view.refresh and nextFrame are interconnected, but I have not done tests particularly with the view refresh function, so this second point could be false.

[thomthom]

For animations it's best to use the Animation class instead of using sleep() and forcing a screen refresh.
http://www.sketchup.com/intl/en/developer/docs/ourdoc/animation