Sonja

it is solved here! https://forum.babylonjs.com/t/using-texturelod-in-shadermaterial/2066

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 i added : var engine = new BABYLON.Engine(canvas, false); engine.getCaps().textureLOD = true; In fragment shader i added #extension GL_EXT_shader_texture_lod : enable and in fragment shader i tried to use textureLod like this: vec3 prefilteredColor = texture2DLodEXT(equirectangularMap, R, roughness * MAX_REFLECTION_LOD); then i got the error..."ERROR: 0:51: 'textureLod' : no matching overloaded function found" I found some examples about textureLod and BabylonJS in playground, but non of them works. Do you have any idea about this topic? thanks, Sonja