"So I can't edit my normal map at all in a paint program?" - You can. Just about any editing that you do in your paint program that doesn't preserve the exact colors that were there when you started will give you incorrect results. "Can't I just paint with the colors that are already there?" - Yes, but if your brush has a soft edge, the blending will give you colors that no longer result in a vector length of one. So you can't just go painting colors and expect them to give you good lighting when used as a normal map. This means that only a very specific set of colors can be used. Not only that, but the three values together must yield a directional vector whose unit lenth is one (a normalized vector). Well that's easy, you can just open the normal map in Photoshop and fix those with the clone tool, right? WRONG!Ī normal map is very different from a regular texture, because the colors represent the X, Y, and Z values of a directional vector instead of just a color. So you've created your normal map, you apply it to your model and it looks great! - Except for those annoying seams and those few spots that didn't turn out quite right. NORMAL MAPS: PART II - page 4: Tips for Editing Normal Maps Normal Mapping Tutorial: Part II - page 4: Tips for Editing Normal Maps BEN CLOWARD - Technical Artist
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