Hello.  I exported a Kayak model from Substance Painter 2 as a glTF with the Metallic Roughness configuration.  The Kayak has a red/yellow gradient png texture on it.  Exporting from Substance Painter 2 gave me  Kayak_baseColor.png, Kayak,_normal.png, and Kayak_occlusionRoughnessMetallic.png textures.  In my Babylon JS scene, I import the model (Kayak.gltf)and am trying to switch the Kayak_baseColor.png  to Lime_baseColor.png on load.  The Kayak loads into the scene with it's red/yellow gradient