// BASIC OBJECTS THAT YOU CAN ADD ------------------------------
// BASIC FLOOR
public void AddFloor(float width, float length, Vector3 mid_position, Vector3 rotation, string textureFile, Rectangle?sourceRect)
{
Object3D obj = new Object3D();
obj.AddQuad(mid_position, width, length, rotation, textureFile, sourceRect);
Objects.Add(obj);
}