the texture can‘t be displayed

[idclosed]

The example 4.1.2 in the Filament Materials Guide document cannot display textures in Vulkan and Windows systems, and the texture is displayed in black. I'm not sure if there is a bug with texture and roughness parameter settings when ShadingModel is lit.

material {
name : "Textured material",
parameters : [
{
type : sampler2d,
name : texture
},
{
type : float,
name : metallic
},
{
type : float,
name : roughness
}
],
requires : [
uv0
],
shadingModel : lit,
blending : opaque
}

fragment {
void material(inout MaterialInputs material) {
prepareMaterial(material);
material.baseColor = texture(materialParams_texture, getUV0());
material.metallic = materialParams.metallic;
material.roughness = materialParams.roughness;
}
}

[idclosed]

Sorry, my own problem is that I didn't add a light source.