How to change shader type?

Coding Python Support
4

Hi,
some time ago I was writing a small function to create an image texture material.
This is the function:

def _create_new_image_material(name, fname, alpha=1.):
    """Create a new material.
    Args:
        name: name of material
        fname: path to image to load
    Returns:
        The new material.
    """
    
    nodescale = 300

    # load image texture
    bpy.data.images.load(fname, check_existing=False)

    mat = bpy.data.materials.new(name)
    mat.use_nodes = True
    nodes = mat.node_tree.nodes
    nodes.clear()
    
    texture = nodes.new(type="ShaderNodeTexCoord")
    texture.location = 0, 0

    img = nodes.new(type="ShaderNodeTexImage")
    img.location = nodescale, 0
    img.image = bpy.data.images[fname.split('/')[-1]]

    bsdf = nodes.new(type="ShaderNodeBsdfPrincipled")
    bsdf.location = 2*nodescale, 0
    #bsdf.inputs[0].default_value = color
    bsdf.inputs['Alpha'].default_value = alpha
    bsdf.inputs['Specular'].default_value = 0.

    node_output = nodes.new(type="ShaderNodeOutputMaterial")
    node_output.location = 3*nodescale, 0

    links = mat.node_tree.links
    link = links.new(texture.outputs[2], img.inputs[0])
    link = links.new(img.outputs[0], bsdf.inputs[0])
    link = links.new(bsdf.outputs[0], node_output.inputs[0])
    return mat

Hope it helps.

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