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When you're working with a lot of objects in a scene, and you discover that you want to change the material for a whole bunch of them at the same time, it can be a daunting task. This tutorial shows you a very simple way of completing such a task.
It might not seem like such an ordeal, but when you've applied a material to a bunch of objects, and you've fiddled around with one to get it looking just right, you don't really want to have to replicate those changes to the other objects individually.
For this tutorial I'm assuming that you know how to create a scene, and also know how to apply a material to an object.
Okay, now the fun part. Let's say that we want to apply the marble material in the nearest spheres to the whole row on the front right side.
The important thing is to make sure you select an object with the material that you want to keep first. So, we'll click on the nearest sphere to select it.
Now while holding the shift key down, we'll select the spheres that we want to copy the material to.
Go to the materials lab, and you should see the material settings for the first object you selected.
Click on the tick to apply the material, and you have now applied that material to all of the selected objects.
If you do a render, you'll see it all worked as expected.
This simple process can save you no end of headaches, especially when you've spent ages tweaking a material and getting it just right. Or when you have a whole bunch of changes to make.
The main thing to remember is always to select the texture that you want to keep first.