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Decals in XNA or DirectX9

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Decals are just quads that are overlaid over the object below it, usually you use projective texturing for this so that it looks like it is on top of the object below. I would start with a simple flat surface.

 

http://blog.wolfire.com/2009/06/how-to-project-decals/

 

I've seen this blog post. It's ok, but I was wandering if it is possible to get some easier way to do it, and also to use it in real time.

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Basically I should render the model, which is projected on, with multiple textures,

or render the model multiple times blended on top of the original model.

I'll try it. :)

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