// helper function for quickly creating a 3d vertex from 3d position and texture coodinates
	createVertex = function(x, y, z, s, t,s2,t2)
	{
		var vtx = new CL3D.Vertex3D(true);
		vtx.Pos.X = x;
		vtx.Pos.Y = y;
		vtx.Pos.Z = z;
		vtx.TCoords.X = s;
		vtx.TCoords.Y = t;
		vtx.TCoords2.X = s2;
		vtx.TCoords2.Y = t2;
		return vtx;
	}
	

	// our own scene node implementation, lightmapped
	MySceneNode = function(engine)
	{
		this.init();  // init scene node specific members

		
		// create a 3d mesh with n=surfs mesh buffers / materials
		buf=new Array();
		this.MyMesh = new CL3D.Mesh();
for(i=1;i<=surfs;i++){
		buf[i] = new CL3D.MeshBuffer();
		this.MyMesh.AddMeshBuffer(buf[i]);
		
		// set indices and vertices

		// triangle vertex index lists in inde[i]
		for(j=0;j<nverts[i]*3;j+=3){
		buf[i].Indices.push( inde[i][j],inde[i][j+1],inde[i][j+2] );
}//j

		// vertex data in arrays buf[i] is x,y,z,u,v,u2,v2  (7 values)
		for(j=0;j<nverts[i]*7;j+=7){
		 buf[i].Vertices.push(createVertex( vert[i][j], vert[i][j+1], vert[i][j+2], vert[i][j+3], vert[i][j+4], vert[i][j+5], vert[i][j+6]) );
		}//j

		// set the textures of the materials
		
		buf[i].Mat.Tex1 = engine.getTextureManager().getTexture(txx1[i], true);
		buf[i].Mat.Tex2 = engine.getTextureManager().getTexture(txx2[i], true);
		buf[i].Mat.Type = CL3D.Material.EMT_LIGHTMAP;
}//i

function myReadFile(mypath)
// reads a file from a URL into an array, then splits it up into an array of lines
// please note, the data processing is not executed right in the function call, but later, once the file was loaded.
// To access the data, you have to check whether it is actually loaded, eg. by setting a global variable to 1.
{
 fetch(mypath)
  .then(response => response.text())
  .then( data => {
  // here we can process the data
  alert(data);
  alert(data.length);
  const mydata=data.split("\n"); // split at linebreaks
  alert(mydata[0]); // show 1st line
  myfile_is_loaded=1; // global
  } );
}

function readFileC () {
  // (A) GET SELECTED FILE from a <input type="file" value="Choose File" id="demoPickC" o-n-c-h-a-n-g-e="readFileC()"/>

let selected = document.getElementById("demoPickC").files[0];
 
  // (B) READ SELECTED FILE
  let reader = new FileReader();
  reader.addEventListener("load", () => {
    var bindata = reader.result;
    //console.log(bindata);
    alert(bindata); // here again, the data is not available immediately
  });
  reader.readAsBinaryString(selected);
}

 List of geometric vertices, with (x, y, z [,w]) coordinates, w is optional and defaults to 1.0.
v -0.5 -0.5 -0.5
v 0.5 -0.5 -0.5
v -0.5 -0.5 0.5
v 0.5 -0.5 0.5
 List of texture coordinates, in (u, [,v ,w]) coordinates, these will vary between 0 and 1. v, w are optional and default to 0.
vt 0.0 0.0
vt 1.0 0.0
vt 0.0 1.0
vt 1.0 1.0
 define the following as group (or surface) and assign material
g object
mtlib my_mtl.mtl
usemtl mytex
 Polygonal face element (see below)
f 1/1 2/2 3/3
f 2/2 4/4 3/3
 end of file

 X X 
XXXXX
 X X 
XXXXX
 X X 

function my_mainthread(){
// ...
myLoadFile("test.obj");
i_m_waiting();
// ...
  renn=self.setTimeout('my_mainthread()',"33"); 
}

function i_m_waiting(){
 if(my_file_is_loaded==0){
  renn=self.setTimeout('i_m_waiting()',"33"); // 33=30 hz, 17=60hz ...
 }
 else{
  renn=self.setTimeout('my_mainthread()',"33"); 
 }
}