/// <summary>
/// Runs every time, and immediately prior to, a mesh being processed (OnPolymesh).
/// It supplies the material for the mesh, and we use this to create a new material
/// in our material container, or switch the current material if it already exists.
/// </summary>
/// <param name="node"></param>
public void OnMaterial(MaterialNode node)
{
string matName;
ElementId id = node.MaterialId;
glTFMaterial gl_mat = new glTFMaterial();
float opacity = 1 - (float)node.Transparency;
if (id != ElementId.InvalidElementId)
{
// construct a material from the node
Element m = _doc.GetElement(node.MaterialId);
matName = m.Name;
// construct the material
gl_mat.name = matName;
glTFPBR pbr = new glTFPBR();
pbr.baseColorFactor = new List <float>()
{
node.Color.Red / 255f, node.Color.Green / 255f, node.Color.Blue / 255f, opacity
};
pbr.metallicFactor = 0f;
pbr.roughnessFactor = 1f;
gl_mat.pbrMetallicRoughness = pbr;
Materials.AddOrUpdateCurrent(m.UniqueId, gl_mat);
}
else
{
// I'm really not sure what situation this gets triggered in?
// make your own damn material!
// (currently this is equivalent to above until I understand BlinnPhong/PBR conversion better)
string uuid = Guid.NewGuid().ToString();
// construct the material
matName = string.Format("MaterialNode_{0}_{1}", Util.ColorToInt(node.Color), Util.RealString(opacity * 100));
gl_mat.name = matName;
glTFPBR pbr = new glTFPBR();
pbr.baseColorFactor = new List <float>()
{
node.Color.Red / 255f, node.Color.Green / 255f, node.Color.Blue / 255f, opacity
};
pbr.metallicFactor = 0f;
pbr.roughnessFactor = 1f;
gl_mat.pbrMetallicRoughness = pbr;
Materials.AddOrUpdateCurrent(uuid, gl_mat);
}
Debug.WriteLine(string.Format(" OnMaterial: {0}", matName));
}