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copied!<p>Sounds like you're good in the right way. But you're doing a lot of things by hand, which can also be done by just drawing sprites and applying the right formulas.</p> <p><em>For example:</em><br> Suppose your terrain is saved into a giant texture in the alpha channel of the texture. 1 is terrain, 0 is nothing.</p> <p>An explosion happens and the terrain has to be deformed. Update your texture easily by just drawing a black transparent sphere (or explosion area) onto your texture. The terrain is gone, because the alpha value is 0 of the black sphere. Your texture is now up to date, everything was done by the spriteBatch. And nothing had to be checked.</p> <p>I don't know if you wanted a solution for this as well, but now you have one.</p> <p><em>For the burn effect</em><br> Now that we have our terrain in a texture, we can do a post effect on the drawing by using a shader (just like you said). The shader obtains the texture's alpha channel and can now do different things to get our burn effect.</p> <ol> <li>The first option is to do edge detection. Check a few pixels in all 4 directions and see if the pixel is at the edge. If so, it needs to do a burn by, for example, multiplying it with the distance to the edge (or any other function you like)</li> <li>Another way is quite similar to the first one, but does it in two steps. First you do the same kind of edge detection, but you save the edges in a seperate texture. Now, when you are drawing your texture, you can overlay your edges. So it's quite the same as just drawing the ground at once.</li> </ol> <p>The main difference for the second option is that you can also choose to just draw your normal ground and you are not adjusting the pixel in the ground texture on rendering.</p> <p>I know this is a long story, but it is a nice technique. Have a look at toon shaders, they do edge detection as well, even though it is 3D.</p> <p>Keywords: Toon shading, HLSL, Post effects, edge detection, image processing.<br> Recommended reading: <a href="http://rbwhitaker.wikidot.com/xna-tutorials" rel="nofollow">http://rbwhitaker.wikidot.com/xna-tutorials</a></p>

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