3d: java: modification: remake: step works 001

20191112:

	// modified 20191112: 
	// modified 20191112: add t parameter which is  0.0 < t <1.0 and depends on the all_lines
	//
	private boolean hide_lines(Camera cam, LineMesh[] all_lines, int i,
			Mesh mesh, int i_t, float[][] t) {
		
		// step 1. requirement crosspoints
		
		// step 2. requirement blinds
		
		return true;
	}