This is a child page. You can use Parent in the quick nav bar at the top or the bottom of the page to navigate directly back to the parent of this page. Some child pages are more than one level deep, and in that case will require more than one Parent click to reach the outermost document level.

### 16.94.12 - Vortex Particle System Example

Particle Definition

To create the vortex, we used 500 very large particles (32 to 42.) We use a time advance of 1.0 to distribute their lifespans evenly across the lifespan of the system, and started the thing near the bottom of the image using a Center of .95 on Y. It's a 3D distribution with the particles forced out into the ring wall of the vortex, just as a tornado or waterspout would form. Particle palette colors also are spread out along the length of the palette so we have completely varied shades for them.
Force 1

This force makes the particles rise, and it also holds them at 50% transparency. Note that this is the only way to get partially transparent particles — via a force modifier. Otherwise, they're basically opaque, either additive or matte.
Force 2

This force causes the vortex to expand radially at it rises from the base of the image.
Force 3

This force is what causes the vortex to rotate. It also applies some turbulence, because we expect a vortex of any type to wander and twist to some degree. Note: Experimenting with the turbulence really changes the character of the vortex.
Palette

The palette varies from grey towards black. That's because in a wind vortex (tornado, hurricane, dust devil) the opacity and reflectivity varies by the amount and character of the material bring carried in the ring wall; this is being simulated by large differences in the brightness of the particles.
, Previous Page . Next Page t TOC i Index o Operators g Glossary
WinImages F/x, Morph and all associated documentation
WinImages F/x Manual Version 7, Revision 6, Level A

This manual was generated with wtfm
wtfm uses aa_macro and SqLite
aa_macro uses python 2.7
Page 257