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We can add more visual interest to our material by using a Bump Map. A Bump Map is a way of deviating the surface of the model. Now it's not actually changing the shape of the model, it's just changing the way that the lighting and rendering works. I will go into my current material here, here is the logoMaterial, and I have got my Maps rollout, and you'll see there's a Bump channel here. I will click on the button that says None. I could add a procedural map here or a bitmap.
Let's do a procedural map. I will just do a simple Noise Map. Double-click on that. And to see this most effectively let's do an ActiveShade rendering. I will go into the Perspective View, click on Perspective > Extended Viewports > ActiveShade. You can start to see that the cloud pattern on the reflections is starting to deviate, it's getting a little bit swirled there. If I change the Noise parameters, we will see this more dramatically. Let's say I will set the noise Size down to only 5 and press Enter.
And now you can see very clearly that we're getting a Bump effect on the surface of our logo. Now this is not affecting the profile, it's not affecting the actual model in any way, it's just affecting the material. And I can play around with this. I could do Fractal and getting a nice rough effect there, but that might be too strong. And in fact, the default Bump amount is usually too much. I will go back up to the top level of my material, I will just reduce the Bump amount to 10 instead of 30, and now it's not quite as extreme, and it's a little bit more believable.
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