codice e modifiche

codificazione per autorotazione,piano /surface)e sfondo(background)

<surface_clipping>default_surface_
clipping_transfo3</surface_clipping>
  
      <projection>%7</projection>
    
    <optics>central_medium_lens</optics>
    
    <layers>default_layer</layers>
      
  <clipping>default_clipping_transfo3</clipping>
     
   <background_color>red</background_color>
      
  <auto_rotate>slow_auto_rotate</auto_rotate>
   
</gview3>
    <point3>
   
     <id>%12</id>
      
 

<projection>%7</projection>
      
  <optics>central_medium_lens</optics>
    
    <layers>default_layer</layers>
    
    <clipping>default_clipping_transfo3</clipping>
   
     <background_color>red</background_color>
        <auto_rotate>slow_auto_rotate</auto_rotate>
   
</gview3>
    <point3>
       
<id>%12</id>
       
<gstate>defined</gstate>
   
     <value>(0.62609570239183654,-1.1816625571820851,0,1
)</value>
        <
point_style>sphere_point_style</point_style>
       
<point_size>normal_point_size</point_size>
       
<point_color>red</point_color>
        <graphic_layers>default_layer</graphic_layers>
        <base_point_size>point3_base_point_size</base_point_size>
 
   </point3>
    <free_point_on_plane3>
      
  <id>%13</id>
       
<position>(0.37494644679235412,-0.70765567537102247,0.59886443136403633)<
/position>
        <
out_point>%12</out_point>
      
  <in_plane>Z0_Plane</in_plane>
  
  </free_point_on_plane3>
   
<regular_polygon_on_plane_by_center_and_point3>
  
      <id>%14</id>
        <vertex_position>(0.75453520841967015,0.2876069833855154
4,0.58988036275415101)(0.65303690832391226,
1.6692308872120569,0)</vertex_position>
        <
symbol>{3}</symbol>
      
  <out_subplane>%15</out_subplane>
    
    <in_plane>Z0_Plane</in_plane>
       
<in_center>%12</in_center>
   
</regular_polygon_on_plane_by_center_and_point3>
   
<subplane3>
        <id>%15</id>
       
<gstate>defined</gstate>
        <surface_thickness>normal_surface_thickness</surface_thickness>
        <surface_style>solid_surface_style</surface_style>
   
     <surface_color1>light_green</surface_color1>
        <point_style>sphere_point_style</point_style>
      
  <point_size>normal_point_size</point_size>
   
     <point_color>tomato</point_color>
        <graphic_layers>default_layer</graphic_layers>
       
 <curve_style>solid_curve_style</curve_style>
     
   <curve_radius>normal_curve_radius</curve_r

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