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Animals have a layer of longer course hairs which protect the softer fur underneath. These hairs are called guard hairs.
This tool is useful for interactively modifying the amount of guard hairs. It allows you to manually paint the density of guard hairs on the skin geometry.
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 Guard Hair Density
Click the Paint Guard Hair Density tool on the Hair tab.
Select the fur object to paint and press Enter to confirm your selection.
Modify the FG multiplier field to increase or decrease the amount of guard hairs to paint. A value of 0 will remove guard hairs, 1 will not change the amount of guard hairs, and anything larger than 1 will add guard 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 > Guard tab of the Fur Object. The Ratio parameter on this tab scales the effect of the Paint Guard Hair Density tool. There are also parameters for further customization, such as Guard 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 guard 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 White 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.