# Houdini Nodes

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## Dynamic Nodes

`POP Sprite`

- Built-in Houdini sprite map titled "sphere_matte.pic".

`Pyro Solver`

- Preferred over the
`Smoke Solver`

since the`Pyro Solver`

includes similar options, but with additional parameters available.

## Geometry Nodes

`Create Meta Import Node`

Node is accessible via the `Block Begin`

and generates detail attributes *numiterations* and *iteration*, which can assist in randomizing by each iteration.

`L-System`

- L-System Rotation:
- Rotating an L-System to account for the tropism vector (gravity) can be implemented by prefixing the
*Premise*with a turn. Using a`Transform`

after the L-System may or may not coincide with the correct gravity vector.

- Rotating an L-System to account for the tropism vector (gravity) can be implemented by prefixing the
__Resources__

`Mountain`

Adds dimension and variation to the geo.

**Use Case:**Quick way to add animated noise to geo by including time delta via*$T*in*Time*.

`Subdivide`

**Use Case:**Subdividing the geo allows for greater resolution so that noise, such as`Anti-Aliased Flow Noise`

in a`Point VOP`

, can be refined.

`Trail`

This has the option to compute velocity on an animated geo in lieu of generating a trail of geo.

**Use Case:**Quick way of converting the inertia from a moving geo into a*v*attribute.

`Triangulate 2D`

Takes a 2D projection of points and converts it to triangulated polygons.

- Enabling
*Restore Original Point Positions*allows for the output to retain the points' 3D configuration, although the node still projects onto a 2D plane.

### Vellum

__Resources__

## VOP Nodes

`Anti-Aliased Noise`

Bounds are defined as [*-0.5*,*0.5*]. Outputs values in the range of approximately [*-0.3*,*0.3*]. Coordinate with a `Fit Range`

.

`Anti-Aliased Flow Noise`

Bounds are defined as [*-0.5*,*0.5*]. Outputs values in the range of approximately [*-0.3*,*0.3*]. Coordinate with a `Fit Range`

.

`Length`

Gets the magnitude of a vector.

**Use Case:**Get speed from a velocity vector field.

## Node Combos

### Volume Visualizer

The following setup can be used to visualize a volume's field/s:

`Volume Slice`

- Set the Attribute parameter to the attribute in the volume intended to be visualized.
- This creates a plane through the volume and expresses the data on the plane using the defined Visualization Ramp setting.

`Volume Trail`

- Disable the Detect Range option and adjust the Maximum parameter to hone in on the min/max range to the specific data in the volume.