node setup

1.-I am making some low poly objects with normal maps in cycles. All of them are working correctly but when I plug a normal map in a object with a glass shader it becomes opaque with some reflections on the surface. Is there an additional step to make normal maps work with a glass shader?

2.-I discover something weird. The fact is that I am using a tangent space normal map(purple map), but if I change the setting in the normal node from tangent to object space(blue and yellow map) it seems to work fine.

I uploaded a zip folder with the blend file and the normal map here: https://copy.com/ADi3bvAGpR9o

  • 1
    $\begingroup$ You need to show a screenshot of your nodes and a render, preferably a simple blend file as well. $\endgroup$
    – Greg Zaal
    Aug 14, 2014 at 7:43
  • $\begingroup$ Your problem is probably that you need to use a Normal Map node, and connect it to the displacement of the materail $\endgroup$ Aug 14, 2014 at 11:00

1 Answer 1


I SOLVED IT !!! I did another object and again I ran into the same problem. But this time the mesh looked fine from above but completely black from below. I switched from object space to tangent space and after a few hours I decided to play around with the normal map strength and it seems that glass shader doesn´t like normal map values greater than 0.4 and After 0.46 the mesh starts looking completely black.

this values are for my particular project.

  • $\begingroup$ This doesn't sound like the real solution but like a workaround... $\endgroup$
    – Samoth
    Mar 25, 2016 at 20:11

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