However, the author of the plugin recommends the Prewitt 5x5 filter. The default options will work fine, except that you should invert the Y axis (as OpenGL vectors origin is the bottom left rather than top left).If this is not present, you haven't installed the normalmap plugin as described above. Now we need to convert the height map to a normal map.Once you are satisfied with your height map, delete the background layer, increase the opacity back to 100% and save it as a new file.If you want well-defined edges, draw using a sharp-edged tool. Now use whatever painting technique you wish to draw the height.So, at the moment the entire height map is at sea level. This layer will be a height map, with black representing low points, and white representing very raised points. Adjust the opacity of the new layer so you can see the texture underneath.We'll use the existing texture as a guide to creating the normalmap. Open the texture in GIMP and create a new layer with black as the background color.The same texture coordinates will be used for the normal map. Given that most aircraft textures are sensibly organized, this should be straightforward. Find the part of the texture (the texture coordinates) that apply to the object.Identify an object that you intend to apply the normal map to using Blender AC3D etc.Once you have the GIMP plugin installed, create the normal map as follows. You can find more information on this approach, applied to blender, here On the other hand, we can create a high polygon density model of the object in a 3D editor, and generate the normal map from this model.Those on Ubuntu should be able to install it directly from the package manager. There is a good normalmap plugin for GIMP available. We can use a plugin that can convert a 2D texture representing height to a set of normals.To create the normal map, there are two options.
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