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I'm just starting to learn Blender and watching this tutorial video that tells you how to use nodes and mix Diffuse and Glossy BSDF. I'm having problems with the "Fac" part of mixer, as it seems to update in "Preview" section on the right, but not in the actual editor :(

Also, in the video, the guy goes to Node Editor right away and everything's already there, but I didn't see any nodes in the Node Editor until I clicked on "use nodes" in the materials section. Can that have something to do with it?

And now changing Shader color in the menu on the left doesn't do anything either, I have to go down to the Settings and change it in Viewport %\ ...

I'm so confused ...

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Your current screen shot shows you are in Solid draw mode and that will not update to preview your material, change it to Material draw mode and you will get a better idea of what is going on. Even faster idea of what is going on is to set a border in the 3d view with Ctrl-B and to then press Shift-Z to change to Render preview mode inside the border, and that way you will see actual feedback as you change the shader.

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  • $\begingroup$ Material draw mode doesn't work that well :\ ... with Glossy all the way at 100%, it shows a nice metal ball in Preview, but the donut frosting just turns white and flat :I ... Also, isn't continuously rendering gonna be super slow? My laptop isn't that great. Edit: oh, I guess he was in Rendering mode in the video ... he coulda mentioned it =_____= ... also, what is this Ctrl-B you're speaking of? Mine just goes to selection mode. $\endgroup$ – Raksha Nov 2 '17 at 19:37
  • $\begingroup$ Press Ctrl-B to draw a rectangle in view and turn on Border and Crop in the Render panel of the properties editor. If you have your Samples set to 10 or 20, then the performance hit is negligible. You should look at using an hdri in your environment shader so that your gloss shader has something to reflect, otherwise you won't get the effect you want. $\endgroup$ – Craig D Jones Nov 2 '17 at 20:13

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