Create hairlines and bald spots using Ptex maps

You can create a Ptex-based map to mask out areas of your character mesh that you do not want hair or fur to appear. Follow this example to create a Ptex-based mask to define the hairline on a partially groomed character. Yon can use the same technique to create bald spots.

To create a hairline for your hair groom

1. In the XGen toolbar, clear the preview and turn off Update Preview Automatically.

   Click the Primitives tab.

   In the Generator Attributes section, click beside Mask then select Create Map from the menu that appears.

2. In the Create Map window, type a name for the map such as mask_Hairline.
3. Set the following:
   • Map Resolution to 30.

     This sets the number of texels per-face for the Ptex map.

   • Start Color to Black

     This sets the map value to 0, which masks out the mesh surface so no splines generate. When painting on the mesh, you use white. This sets the painted areas to 1, which generates splines on the surface.

4. In the Tool Settings window, set the following:
   • Beside Artisan, select a brush.
   • In the Color section, click the color swatch and select white.
   • In the Paint Operations sections, set Blend mode to Default.
   • In the Stroke section, turn on Reflection.
   • In the Stylus Pressure section, turn off Stylus Pressure.
   Note: If the 3D Paint Tool window does not appear, click this icon in the Tool Box to open it.
5. Use the 3D Paint Tool to paint the areas of the scalp that you want hair to appear.
6. Click this icon to save the Ptex map.
7. Preview the Description.
   
8. (optional) Continue to modify the map by clicking this icon beside Mask, painting on the mesh, and then clicking to save your changes.