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  1. it is solved here! https://forum.babylonjs.com/t/using-texturelod-in-shadermaterial/2066
  2. hi guys, I am new in BabylonJS, and trying to build some PBR materials with special effects, for example "thin film iridescence" in BabylonJS. I am learning something about PBR-Material and building my own PBR-Shader. I built a basic PBR-Shader, and now I want to do something more with IBL(image based lighting) and hdr. For Specular IBL i need to use textureLod Function from openGL to load mipmap according to the roughness levels. I tried something, but i always get the error "ERROR: 0:51: 'textureLod' : no matching overloaded function found". hier is what i tried. in HTML file
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