optima wrote:
> If I can use a shader in xna that can show 3d objects only as hidden lines
> then problem is solved(almost). Cause I am already familiar with xna.

It's not hard. draw the background in white. Draw the model with clockwise 
culling in black. Draw the model scaled down 2% in white with 
counterclockwise culling. Ta dah. :-)

I'm not sure what you mean by "hidden lines" renders, tho. Do you meen just 
drawing the edges, like your sample picture? Because hidden lines per se is 
pretty easy and already done with painter's algorithm, pov-ray, or any 
graphics card with a depth buffer.

Alternately, draw the model as a depth map and then run it through an edge 
detector algorithm? Again, I'm not sure what you mean by hidden lines.

The phrase you're looking for might be "cel shading", (or cell shading) 
which means a cartoon-like flat-colors look to the image.

http://create.msdn.com/en-US/education/catalog/sample/nonrealistic_rendering

It can make images like this?

http://create.msdn.com/assets/cms/images/XNA_NonRealisticRendering_02_large.jpg


-- 
Darren New, San Diego CA, USA (PST)
   Serving Suggestion:
     "Don't serve this any more. It's awful."

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