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Thursday, 16 June 2016

Creating Normal maps From A Photo

A week or two ago I was looking at a BlenderGuru video that mentioned CrazyBump as a tool for creating a variety of maps from a texture image. But that's $99.
While searching for more information I found this which led me to these GIMP plugins:

normalmap -   (haven't tried this)
Insane Bump (Python) -    (tried it but it needs normalmap?)
Insane Bump (C) -  (with the DLL in the same folder this works)

My first play with it (the C version) worked nicely. Here's thumbs of the maps created from one of my photos:

Here's a Poser 9 render using these maps together:

Here's the shader I used:

And here's what the render was like with just the texture:

I did some checks and confirmed that the normal maps created by the plugin are correctly oriented for Poser. They're tangent space, with green being down-up (0 is down, 1 is up) and red left-right (0 is left, 1 is right) when viewing the normal map in GIMP. That makes sense to me even if it doesn't to you!  ;o)

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