I'm trying to make various diamond-shaped panels with exact real-world dimensions. I'm using Imperial dimensions in inches in my scene. As an example, I start by adding a standard 24" x 24" x 24" cube and add a geometry node modifier. In the geometry node editor, I use a Quadralateral node using the kite shape to get the outline, then using a Convex Hull to turn the edges into faces. This creates two faces, one on the top and one on the bottom, but the object has zero thickness. I then use Extrude Mesh with an Index node going into the Selection input of the Extrude Mesh node to only extrude the top face.
Here's my problem. I want the extruded object to be exactly 0.5" thick. How can I calculate the proper Offset Scale to use? I added a reference cube (the unselected wireframe in the screenshot) that is scaled down to 0.5" thick and then I manually adjusted the Offset Scale until the extruded object was 0.5" thick. The value I need happens to be 0.0064. But what is this value in relation to? If I use 1.000 the extrusion is very long, way more than 0.5". I'm guessing it's a ratio of some sort, but I cannot figure out what it is relating to.
So...how does the numeric value in Offset Scale work?