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I am playing with a scene where I have a treasure protected by a wireframe dome that gets attacked by airplanes. I would like my airplanes to change color when they get very close to the map and have them disappear when they try to go through the dome.

My idea was to use the Shading editor and based on the plane's location, change their color then make them become transparent. The issue that I'm having is that it is not only based on the airplane location but also on the dome's location. So here's my question: is there a way for me to use another object's information (i.e. the dome's location and radius) inside the Shading of an object (i.e. my airplane)? Or is there a better way to do this (without manually animating it).

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You can use Object coordinates for this

  1. Use Texture coordinates > Objects and target the dome
  2. Use one ColorRamp for Base Color
  3. Use another ColorRamp for alpha channel

enter image description here

Here a simple setup how you could realize it with two objects, which define the color of a third object:

enter image description here

enter image description here

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  • $\begingroup$ I know this changes color not material, but it's to keep it a bit simpler :) $\endgroup$
    – jachym michal
    Commented Jan 15, 2022 at 10:56
  • $\begingroup$ Amazing! This is exactly what I was looking for. Thanks a lot! $\endgroup$
    – Migwel
    Commented Jan 15, 2022 at 12:05
  • $\begingroup$ Happy to help, good luck with your project ;) $\endgroup$
    – jachym michal
    Commented Jan 15, 2022 at 19:16

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