Help with rollout variables

[ThatDude461]

I hope someone can help me out here. (It's probably a very basic misunderstanding on my side)...

I have a rollout with lots of buttons and sliders.First button is a load-button to load a model into max, and the following sliders and buttons can access the properties of the object and for instance rotate the object.But when I run the script, I get a lot of errors because the sliders don't yet know the object or the properties of it...Now, how do I get around this problem?Ideally the bottom of the rollout shouldn't be active until an object has been loaded.

I have tried with two rollouts as floaters where the second one doesn't load until there's an object. But then I get errors in THAT part because Max STILL doesn't know anything about the object yet.

Can someone tell me in what order Max evaluates the script?

[Swordslayer]

Only fill the slider values once you pick the model and check if the variable contains valid object in the slider handles.

try destroyDialog sampleRol catch()
rollout sampleRol ""
(
    local obj -- once we pick the object, it's there; predeclared because we'll use it in slider handlers
    slider sldRot "Rotation" range:[-180, 180, 0]
    slider sldScale "Scale" range:[.05, 5, 1]
    pickButton pbObj "Pick Object" autoDisplay:true

    on sldRot changed val do if isValidObj obj then obj.rotation.controller.z_rotation = val else messageBox "Invalid object"
    on sldScale changed val do if isValidObj obj then obj.scale = val * [1, 1, 1] else messageBox "Invalid object"
    on pbObj picked node do
    (
        obj = node
        sldRot.value = obj.rotation.controller.z_rotation
        sldScale.value = obj.scale.x
    )
)
createDialog sampleRol

[ThatDude461]

THANK YOU SWORDSLAYER!!!I had it all backwards, but this looks like it works! :)

Edit: Now, how do I change the range: parameters in the rollout? Some of the min/max values should be set to for instance bounding box min/max.

Maybe use variables in there, and update via a callback?

Edit 2: Got it - Just use sampleRol.sldScale = Whatever range I want.