Alpha Mapping in Cycles – Blender Tutorial


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In this tutorial you’ll learn how to use an alpha map in cycles to make something transparent in certain parts.

We’ll be making a leaf by creating an alpha map from the original leaf texture to use as a mask between a diffuse shader and a transparent shader

This tutorial assumes you have some basic knowledge of how to use Blender and cycles.

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35 responses to “Alpha Mapping in Cycles – Blender Tutorial”

  1. All right, I give up. Does Blender not use masks from RGB channels? I'm able to do this in Unreal and can't seem to make it display correctly in Blender. I have a RGB mask image/texture that I'd like to use to mask certain parts of the diffuse texture for certain things, and plugging in that mask image (all three RGB channels) should function as an alpha mask.

    While I'm at it, does partial opacity never work in the Material view in the viewport? With alpha channels, my stuff looks great in Rendered but has white bits otherwise. Would love to be rid of those.

  2. Great tips, but…. voice. This relaxed type, i don't know…"super-nerd speaking under table only with him self" voice is very…I mean, very annoying. If You like to improve Your speech, speak more confidently, brave, more healthy. I am hearing a lot Young people talking like before death something super vise, but this pushes away all interest. How ever – tips are useful. Big, big thanks!

  3. There is a much better way to create alpha map image in Gimp:
    1) Load the image with transparency into Gimp.
    2) Right button to the layer.
    3) Select "Alpha to Selection" menu item.
    4) Click on "Create new layer…".
    5) Select "Foreground Colour" as "Layer Fill Type".
    6) Press Ctrl+. (Control plus dot) ("fill with background colour").
    7) (Optional) Delete the original image layer, and convert the created image as grayscale image.
    8) Export as you wish, either jpg or png.
    Done.

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