Sonja Posted March 22, 2019 Share Posted March 22, 2019 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 Quote Link to comment Share on other sites More sharing options...
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