Setting Material to Transparent makes it Black

[cyborgsince90s]

Good Day,

I am trying to follow a similar thread to change the opacity of the mesh.
But when I use the following code, My model becomes black and not transparent.

The console log shows the materials is already set to "Blend"

I have tried all RGBA patters, 0,0,0,0...0,0,0,-1 etc.

This is my code.

`var colorString = "0,0,0,0";

function SetMaterialsToTransparent(){
const material = modelViewer.model.materials[0]; // Access the first material
material.alphaMode = "BLEND";
material.pbrMetallicRoughness.setBaseColorFactor([colorString]); // Set opacity to 0.1
}`

FYI, My model has all the common textures.