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This tool is useful for interactively modifying the amount of white hairs. It allows you to manually paint the density of white hairs on the skin geometry.
You must render your image to see the white hairs. Using this tool will not change the appearance of the fur in the viewport.
After adding fur with the Add Fur tool, use the Comb Fur tool and some of the paint tools to style the fur. Finally, use the Add Dynamics tool to make the fur react to the character’s motion and external forces.
Using Paint White Hair Density
Click the Paint White Hair Density tool on the Hair tab.
Select the fur object to paint and press Enter to confirm your selection.
Set the FG multiplier field to the amount of white hair you would like to paint. For example, 0 will remove all white hairs, 1 will not change the amount of white hairs, and 10 will paint all white hairs.
Drag the brush over the surface to paint it.
You can change the Radius of your brush by holding ⇧ Shift + and dragging or by changing the value in the Operation Controls toolbar. You can also alter the Opacity in the Operation Controls toolbar.
For specific parameter help see the Paint node help.
The parameters on this tool are associated with the parameters on the Hairs > White tab of the Fur Object. The Ratio parameter on this tab scales the effect of the Paint White Hair Density tool. There are also parameters for further customization, such as White Map that will that will allow you to use texture maps.
Houdini will recook each time a brush stroke is made. To improve responsiveness while painting, reduce the Display Density on the Basic tab of the Fur Object. If this does not speed up Houdini enough, you can turn off the Display checkbox which will disable the display of hairs for improved responsiveness while you paint the geometry.
If you simply want to turn off the display of hairs for a moment when painting, you can hide other objects in the viewport by clicking in the viewer toolbar and selecting Hide Other Objects. This has the same effect on performance as turning off the Display checkbox on the fur object. Once you are done painting you can click and choose Show All Objects to display the fur again.
Once you paint the white hair density, you may want to use some of the other paint tools to style the fur, such as: Paint Density, Paint Length, Paint Clumping, Paint Base Color, Paint Frizz, Paint Guard Hair Density, or Paint Guard Hair Length.
You may also want to use the Add Dynamics tool to make the fur react to the character’s motion and external forces.