# Edit components

To...Do this

Move, rotate, or scale points, faces, and edges

1. Select points 2, faces 3, or edges 4.

2. Click Move, Rotate, or Scale in the toolbox down the left side of the viewer.

3. Use the handle in the viewer to move, rotate, or scale the selected components.

When moving points, you can use the Soft radius control in the operation toolbar to add a soft fall-off to each movement.

When Soft radius is greater than 0, moving the selected point(s) also moves surrounding points by a smaller amount based on distance.

Edit points by painting

Use the Sculpt tool on the Model shelf to push, pull, or smooth points. See how to use brush tools for basic information on the brushing interface.

You can also use the Paint surface node to paint color or other attributes onto a surface.

Edit normals

Houdini has four types of normals: plane normals, point normals, vertex normals, and surface normals. They indicate the orientation (direction) of a point, plane, vertex, or surface curve.

If a curve is planar and does not share its points with other primitives, its default point, vertex, and primitive normals are identical: perpendicular to the plane of the curve.

Use the icons in the display toolbar (on the right side of the viewer) to show or hide point normals and/or face normals.

Use the Comb tool on the Character tab of the shelf to reorient normals by painting.

Use a Point node to set the normal vector of points manually.

# Geometry

## Understanding ¶

• Describes how Houdini represents geometry using details, primitives, points, vertices, and attributes.

## Modeling ¶

• In Houdini you can not only edit the parameters of a surface node, you can reselect the geometry the operation applies to.

## Terrain ¶

• How to use Houdini’s height field tools to generate realistic terrain.

• A heuristic workflow using the heightfield tools, based on experience generating realistic-looking terrain.

## Fracturing ¶

• How to break different types of materials.

## Clouds ¶

• How to create 2D and 3D cloud patterns using the Sky Field node.

## Next steps ¶

• The appearance editor mode of the data tree pane lets you edit various controls for object viewport/rendered appearance in one place.

## Guru level ¶

• You can mark a chain of compilable SOPs as a compiled block which can execute much faster in parallel.

• Many geometry (SOP) nodes allow you to use them in Python scripts to generate geometry programmatically.

• Some nodes use a library that gives a speed boost for floating-point operations but can make the output vary between different computers. You can control how much the library tries to guarantee reproducible results.