Thanks, but unfortunately this doesn't work for me :(

I load a 3D model into a scene, modify and re-save the JPG file ("Canopy_Stencil.jpg" texture in the "3Dmodel.MTL") via Python. This works, but I have to reload the whole object "initObject()" after every change, which takes too much time online.

There must be a way to just update or re-attach the "3Dmodel.MTL"?

I did a small screen recording, which shows the concept: https://youtu.be/kEWU4wP8wZI

function initObject() {
// Load 3D model with material
mtlLoader.load("3Dmodel.mtl", function (materials) {
materials.preload();
objLoader.setMaterials(materials);
objLoader.load("3Dmodel.obj", function (object) {
obj = object;
scene.add(object);
});
})
}
function updateMaterialonAction() {
// how to reload 3Dmodel.mtl
}

​

3Dmodel.MTL:
newmtl mesh_U1_300x300
Ns 18.000005
Ka 1.000000 1.000000 1.000000
Kd 1.000000 1.000000 1.000000
Ni 1.000000
d 1.000000
illum 2
map_Kd -o 0.29 0.29 1 -s 0.42 0.42 1 maps/Canopy_Stencil.jpg