Houdini 21.0 Shelf tools

Aerial Ground Barrage shelf tool

Creates a large scale aerial explosion that moves towards the ground.

On this page

This tool sets up a sparse pyro simulation of a large scale aerial explosion with density trails that shoot towards the ground and create shockwaves. The explosion simulation consists of a main blast and long trails of density that fly out much further and faster than the main explosion.

This tool is similar to the Aerial Barrage shelf tool, but moves downward instead of horizontally. Additionally, the density trails are made to mimic projectiles that hit the ground and create shockwaves and dust explosions.

The shockwaves and dust explosions occur where the pyro trail path impacts the ground.

Pyro simulation in the viewport. Color space: ACES, Voxels Size: 0.1.
Pyro simulation rendered with Karma. Color space: ACES, Voxels Size: 0.1.

Important Nodes

add1

The add1 node controls the location of the explosion.

adjust_N1

This node controls the direction of the main explosion. It creates a normal attribute used inside the pyroburstsource1 node.

adjust_startframe1

Controls the timing of the ground elements and explosion using the Constant Value parameter.

pyrotrailsource2

The pyrotrailsource2 node creates a trail_temperature VDB that is used in the shader to add fire to the tips of the density trails. This is controlled in the Secondary Fire tab in pyrobakevolume1.

Learning from this example

To...Do this

Change the shape of the explosion

Adjust the Shape Offset parameter on the pyroburstsource1 node.

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