Blackmagic Forum

I am using a tracker with:

> Match Move option
> FG only
> Position / Rotation / Scaling: all checked

How can I get the Scaling parameter value for use in a Simple Expression?

I cannot use the pickwhipping technique because this parameter does not appear in the Tools tab.

I have manually tried without success:
Tracker1.Scale
Tracker1.Scale.X
Tracker1.Size
Tracker1.Size.X

Another question: Is there a script that can list all the parameters of a node ?

Thanks for any help.

I don't have a direct answer for you since I've never needed this before. Why do you need it to be in a simple expression? When I need to access this info I usually use a modifier instead of an expression.
Can you please elaborate?

Sure.

I want to use the Tracker Size parameter, but I want to reduce it by a factor.

For example: Let's say that the resulting Tracker Size is 1.4. I want to divide it by 2, resulting in 0.7 and use this calculated value in a Transform node.

In cases like these I'd modify the size of your transform with RC-->modify with-->calculation and connect the first operand to you tracker's steady size, set the operator to divide and the second operator to 2.

You want UnsteadySize

To find all the Outputs of a tool, select it and use this code in the Console:

Code: Select all

for _, out in ipairs(comp.ActiveTool:GetOutputList()) do print(out:GetAttrs().OUTS_ID .. ": " .. out:GetAttrs().OUTS_Name) end

Likewise, if you want all the possible Inputs:

Code: Select all

for _, inp in ipairs(comp.ActiveTool:GetInputList()) do print(inp:GetAttrs().INPS_ID .. ": " .. inp:GetAttrs().INPS_Name) end

Reference: https://www.steakunderwater.com/VFXPedi ... ing_Inputs

Thanks Sander. It works!

In my case the desired parameter was Unsteady Size but it was easy to select it in the Modifier.

Thanks Bryan. Tracker.UnsteadySize also did the trick. Thanks for the scipt too!