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I would like to make the value of a node, say a blur node, influenced by the distance between two objects (say a camera and a cube) with blender render engine. How would you achieve that?

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Yes, with Drivers

You can animate a property with a combination of values of other chosen properties.

To set up a Driver, just right click in the parameter field and choose "Add Driver"->"Manually create later" from the pop up menù. In the following example I added a "value" node and linked and added a driver to control it's value (the purple one), but I might have directly controlled the Size parameter of the Blur node itself:

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In the Graph editor, under the Driver editor type, you can easily set up a Distance Driver Type and pick the two objects (camera and cube in the following example):

enter image description here

Here's the result:

enter image description here

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  • $\begingroup$ This is exactly what I was looking for. Thank you very much! $\endgroup$
    – Thibaut
    Commented Nov 5, 2017 at 13:13

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