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Howto:Use the normal map effect in aircraft: Difference between revisions
Howto:Use the normal map effect in aircraft (view source)
Revision as of 11:22, 16 April 2010
, 16 April 2010Explain how alpha channel is used to alter shininess (the 'spec' part of bumpspec ;)
(Link to last revision of README.effects) |
(Explain how alpha channel is used to alter shininess (the 'spec' part of bumpspec ;)) |
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# Now we need to convert the height map to a normal map. To do this, use Filters->Map->Normalmap. 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. To do this, use Filters->Map->Normalmap. If this is not present, you haven't installed the normalmap plugin as described above. | ||
# 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). However, the author of the plugin recommends the Prewitt 5x5 filter. Once you are happy with the options, press OK, and your image should turn generally blue, but with some strange colours around the areas that you coloured white. This is the normal map. | # 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). However, the author of the plugin recommends the Prewitt 5x5 filter. Once you are happy with the options, press OK, and your image should turn generally blue, but with some strange colours around the areas that you coloured white. This is the normal map. | ||
# Optionally, modify the transparency of the map to alter shininess. Fully opaque texture means maximum shininess. Fully transparent means no shininess, but often other channel are also erased, so to not loose the normal information, always keep a little bit of opacity. You can alter the texture with the eraser tool or use a layer mask. You may want to try to use a noise pattern in the layer mask to simulate dirt and wear on the airframe. | |||
# Save off the normal map as a new png file in your aircraft directory, remembering the correct path. | # Save off the normal map as a new png file in your aircraft directory, remembering the correct path. | ||