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I'm using Cycles to make a procedural texture on an object, wanting to use the distance from an Empty in part of the calculation. I will use several Empties, in fact. Which node can provide this distance?
If possible, I'd also like the distance from a line, or other geometric measures involving objects other than the one I'm texturing.
You can use Drivers to do this.
Add a value node, then right click on the number button and select Add Driver
In the Graph editor, switch to drivers in the header:
Select the driver on the left panel, then set it to Sum values or Averaged value to avoid your driver being blocked by the python security features. Then set the variable type to Distance and select the empty and the object to which the material is assigned. Unfortunately there doesn't seem to be a way to reference the object(s) to which the material is assigned without specifying them individually with separate drivers.
it's possible with texture coordinate node, with the object output. You get the distance of X, Y and Z from the empty mesh-wise, so you apply sqrt(x² + y² + z²), though you don't get an unique value of distance.
