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Currently I have a map as shown below with ~1k triangles and a 1024x512 texture, my question is if it would be better to render shadows on it using: A: A small section of the already added texture with alpha using Alpha Blending like shown at here and applied to the map via a few extra polygons. B: A small texture with alpha using Alpha Blending and applied to the map via a few extra polygons. C: A second texture using a layering shader like here. D: Some other method I have not come across yet.
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I would recommend using the built-in Best lightmapping, because it is very easy to use. If you don't have the texture memory available to make that look great, then I recommend seeing if you can paint some shadows that you like into the vertex colors. (You can always use a vertex lit shader on a model, without a texture, as a reference to paint by.) Also, do note that you're wasting half of your texture space with a non-square image, unless you plan on using it uncompressed.
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You may need to bake in a lightmap to use for the level itself, and then use a shadow projector on moving objects.
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