Purpose of SpecularMap in a TerrainLighting?

I am not sure if other people on linux experience the same issues. Also, I haven’t tested the advancedpbrterrrain.

Here are my settings:

INFO: OpenGL Renderer Information

  • Vendor: Intel
  • Renderer: Mesa Intel(R) Xe Graphics (TGL GT2)
  • OpenGL Version: 4.6 (Compatibility Profile) Mesa 23.2.1-1ubuntu3.1~22.04.2
  • GLSL Version: 4.60
  • Profile: Compatibility

Here is a screenshot of the PBRTerrainTest.java:

This is what the PBRTerrainAdvanceTest looks like:
Triplinar off:

And this one is with triplinar on:

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