Houdini 17.0 Shelf tools Guide Brushes tab

Draw Hair shelf tool

Lets you add freehand-drawn hair guides to a fur object.

On this page

This tool creates hair guides as you draw curves in the viewport. It is like the Add Fur tool; however, instead of selecting an object and adding fur all over it, you are able to interactively draw where you want the hair in the viewport. No guides are generated procedurally. Guides can be drawn in the screen plane or along the skin geometry. This tool is typically used for the basic setup of long hair.

Once the curves are drawn, you may want to add more style to the general direction of hairs. This can be easily done using the Comb on Screen or Surface Brush shelf tools.

Using Draw Hair

To...Do this

Draw a guide away from the skin

  1. Click the Draw Hair tool on the Grooming tab.

  2. Select the geometry to draw hair on and press Enter to confirm your selection.

  3. Rotate the camera to look at the skin where you want to draw the hair. Hair will be drawn on a plane that is parallel to the camera.

  4. Click the surface of the object in the spot you want to draw the hair, and drag your cursor to draw the hair from the root to tip.

Draw short fur onto Skin

  1. Click the Draw Hair tool on the Grooming tab.

  2. Select the geometry to draw hair on and press Enter to confirm your selection.

  3. Change the Draw On parameter to Skin. This will project the hairs onto the surface of the skin.

  4. Turn on the Limit Curve Length checkbox and set the length of the fur you want to draw. You can also turn on Create Roots Along Stroke, if you want hairs to be created as you drag.

  5. Click the surface of the object in the spot you want to draw the hair, and drag your cursor to draw the hair from the root to tip.

Tip

Scrolling the mouse wheel or holding ⇧ Shift while dragging will let you resize your brush.

Note

Hair length can easily be adjusted afterward using the Length Adjust tool.

For specific parameter information, see the Draw Hair Guides help.

Tips

Turn off Display > Object Visibility > All Other Object Types when grooming, so that you don’t see another version of the guides when animating. This is especially important when adding dynamics to fur, since they will recook as you groom. You may want to do this even if you are not animating. Visually it won’t make a difference, but it will be slower since the fur is being drawn twice.

To...Do this

Control how dense the fur is drawn

Adjust the Guide Spacing parameter on the Root Creation tab.

Control specifically where hair is drawn

Create a group for the geometry you want to draw hairs on, and reference it in the Skin Group parameter.

For example, it is useful to create a scalp group for human characters, to avoid accidentally drawing hair on the forehead and neck.

Push hair away from the skin

Increase the Skin Normal Force on the Guide Advection tab. This makes the hair stand up off the skin, instead of laying flat.

Hide guides and see the roots as points on the skin

Turn on the Display Roots Points Only on the Root Creation tab.

Guide Brushes tab