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I created the following node setup to place an image on 1 side of a plane and have the other side white.

Mix Shader setup

Render Preview

The issue is now the material will not catch any light from a lightsource.

The following node setup works but then the image is on both sides of the plane.

Principle Shader

Render Preview with Lights

Question

How can I use Geometry and a mix shader in my material and have it catch light?

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  • $\begingroup$ @RobertGützkow I guess I would only want 1 side to be diffused and the side with the image to have specular reflections. $\endgroup$ – AndrewH Mar 25 '20 at 18:41
  • $\begingroup$ Then you can simply use your first node setup and add a Principled BSDF between the Image Texture node and the Mix Shader. Set the Specular value of the Principled BSDF to control the amount of specular reflection. Does that solve your problem? $\endgroup$ – Robert Gützkow♦ Mar 25 '20 at 18:43
  • $\begingroup$ @RobertGützkow I have added some render preview images. The 4th image with the stem lights, see how they cast a light onto the image? $\endgroup$ – AndrewH Mar 25 '20 at 18:45
  • $\begingroup$ The first setup is almost right, you just shouldn't connect the Image Texture directly to the Mix Shader. The green sockets should be used to connect Shaders. Take the nodes from the second setup (without the Material Output) and connect the output of the Principled BSDF with the Mix Shader. $\endgroup$ – Robert Gützkow♦ Mar 25 '20 at 18:49
  • $\begingroup$ @RobertGützkow Awesome! Do you want to write that for an answer so I can mark answered? $\endgroup$ – AndrewH Mar 25 '20 at 18:52
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The first node setup is almost right, except that you're missing a shader between the Image Texture node and the Mix Shader. The green sockets indicate that the input to the Mix Shader should usually be the output of another shader, for instance the Principled BSDF.

Start from the node setup from your first screenshot and add a Principled BSDF. Disconnect the Image Texture node from the Mix Shader.

Connect the:

  • Color output socket of Image Texture node to the Base Color input socket of the Principled BSDF node

  • BSDF output socket of the Principled BSDF to the upper Shader input socket of the Mix Shader

Adjust the properties of the Principled BSDF to get the desired look. Specular controls the amount of specular reflections.

Node setup

Front

Back

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