I am working on cycle render using MakeHuman model. On MakeHuman , model has some texture images. I remark for example when I do a person with t-shirt that there is two images shirt_normals.png and shirt_texture.png. In the Node mode, I rely these images as mentioned in the below image. What is the difference between these images? And is my work is correct? Because, I could not remark any effect of the shirt_normals.png image.
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asked Feb 26, 2015 at 16:28
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$\begingroup$ Did you UV unwrap it? $\endgroup$– J SargentFeb 26, 2015 at 16:29
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$\begingroup$ @NoviceInDisguise,Yes I did. I edit my image. $\endgroup$– BetterEnglishFeb 26, 2015 at 16:32
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$\begingroup$ You have to attach the texture to both images... $\endgroup$– GiantCowFilmsFeb 26, 2015 at 16:37
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$\begingroup$ You mean Nodes? ^^ $\endgroup$– J SargentFeb 26, 2015 at 16:38
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$\begingroup$ @GiantCowFilms, Yes I did. I edit my image. $\endgroup$– BetterEnglishFeb 26, 2015 at 16:48
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1 Answer
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The texture (usually called a diffuse map) simply affects the color of the object. The normal map affects the normals to create a bump-mapping effect. This works by converting the red and green channels of the normal map to x and y (or y and x, I forget which) rotation of the surface normals (0.5 being straight up, or no change) to simulate small bumps and surface details for added realism. (The blue channel is actually ignored, though it is usually set at 0.5 as well which makes for the distinctive pinkish/bluish color of a normal map.)
As for your setup, you have two problems:
You need to send the normal map through the color input of a vector > normal map node and the normal output of that to the normal input of the shaders.
You are giving the normal map normals as mapping coordinates, all texture maps should have the same mapping coordinates. In this case it looks like you are using generated for the diffuse so you should use generated coordinates for the normal map as well.
Credit to @Vladimir for image, this is a croped version of his screenshot as I don't have Blender available at the moment.
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$\begingroup$ @startingBlender I am on my tablet now, so I don't have Blender available to take a screenshot. But if you give me a couple minutes I can probably find one on the web! :D $\endgroup$– PGmathFeb 26, 2015 at 16:53
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$\begingroup$ Did you mean like that? (I edited my image) $\endgroup$ Feb 26, 2015 at 16:54
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$\begingroup$ @startingBlender Sorry, but I don't see any difference. Did you upload the right image? $\endgroup$– PGmathFeb 26, 2015 at 16:56
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$\begingroup$ @Vladimir If you don't want me to use your screenshot feel free to remove it. $\endgroup$– PGmathFeb 26, 2015 at 17:10