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Du/dv map
(Redirected from Du/dv maps)
Note:
$dudvmap
is now defunct and is replaced by the Refract
shader. Though, the Water
shader still uses a du/dv map for $bumpmap
.du/dv maps are used for DirectX 8 refractions. If you're a Photoshop user, it's easy to create du/dv maps using nVidia's texture tools.
Creating a du/dv map from a normal map
A du/dv map can be easily created from a normal map in just two steps. You can also do this if you don't want to bother with the nVidia tools.
Note:Work from the source texture (such as a .tga) if possible.
Photoshop
- Open the normal map and invert the colours (Image > Adjustments > Invert or Ctrl+I).
- Go to Colors > Adjust > Brightness/Contrast.
- Check "Use Legacy"
- Set Brightness to -17
- Set Contrast to 100
Paint Shop Pro
- Open the normal map and invert the colours (Colors > Negative Image).
- Adjust the contrast as high as it will go.
You now have a finished du/dv map. When converting to a VTF, set the format to UV88.
See also
- Normal2dudv - utility to convert normal maps to dudv maps
- Height2Normal - utility to convert height maps to normal maps
- Filter Forge