Houdini 22.0 Shelf tools

Magic Trail A shelf tool

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Overview

This shelf tool sets up a particle simulation of a star shape that emits fairy dust particles and smoke generated with a sparse pyro simulation. It serves as a useful example of how to create, layer, and render multiple effects simultaneously within a single setup.

Important nodes

spiral1

Controls the path the star shape will travel along.

carve1

Controls how fast the star shape is moving along the path.

attribadjustinteger2

Generates a variant integer point attribute based on the current particle id. This is useful to assign the particles into different groups after the simulation.

popnet1

Simulates the particles moving along the spiral path.

pyrosolver1

Controls the smoke simulation emitted from the particles.

lopnet1

This network is used to the render all the layers in the particle effect.

copnet1

This network is used to composite all the layers in the particle effect.

camera1

A SOP-level camera that is used for the rendering of the particle effect.

Learning from this example

To...Do this

Change the travel time on the spiral.

Shift the animation keys on the First U parameter located on the carve1 node to control how long it takes to travel through the spiral.

Increase the amount of simulated particles

The Point Separation parameter on pointsfromvolume1 controls the number of source points used by the particle simulation. Lowering this value generates more source points, but it will also increase simulation time.

Change particle simulation

Dive inside the popnet1 node and adjust the two popwind nodes to adjust the turbulent motion of the particles.

Change the color of the particles

Use the ramp parameters on attribadjustcolor1 and attribadjustcolor2 to modify the particle colors.

Shelf tools

Using the shelf

  • Customize the shelf

    How to change the look of the shelf, change and rearrange its contents, and create your own shelf tools.

Technical