Eyeon:Manual/Fusion 6/pCustom
From VFXPedia
[ Main Manual Page ]
pCustom [pCu] | |
|
|
The pCustom tool is used to create custom expressions that affect the properties of particles. This tool is almost identical to the Custom tool, except that the calculations affect properties of the particles rather than the properties of a pixel. |
Contents |
General Concept
The following particle properties are exposed to the pCustom control :
| px, py, pz | particle position on the x, y, and z axis |
|---|---|
| vx, vy, vz | particle velocity on the x, y and z axis |
| rx, ry, rz | particle rotation on the x, y, and z axis |
| sx, sy, sz | particle spin on the x, y, and z axis |
| pxi1, pyi1 | the 2D position of a particle, corrected for image 1's aspect |
| pxi2, pyi2 | the 2D position of a particle, corrected for image 2's aspect |
| mass | not currently used by anything |
| size | The current size of a particle |
| id | (5.2) The particle's identifier |
| r, g, b, a | The particles Red, Green, Blue and Alpha color values |
| rgnhit | This value is 1 if the particle hit the pCustom tools defined region |
| rgndist | This variable contains the particles distance from the region |
| condscale | The "strength" of the region at the particle's position |
| rgnix, rgniy, rgniz | Values representing where on the region the particle hit |
| rgnnx, rgnny, rgnnz | region surface normal of the particle when it hit the region |
| w1, h1 | Image 1 width and height |
| w2 h2 | Image 2 width and height |
| i1, i2, i3, i4 | The result of the intermediate calculations 1 through 4 |
| s1, s2, s3, s4 | The result of the setup calculations 1 through 4 |
| n1..n8 | The values of numeric inputs 1 through 8 |
| p1x, p1y, p1z .. p4x, p4y, p4z | The values of position inputs 1 through 4 |
| time | The current time or frame of the compositions |
| age | The current age of the particle |
| lifespan | The lifespan of the current particle |
Additional information on the custom class of tools can be found in documentation for the Custom tool. All of the operators, functions and conditional statements described for that tool apply to pCustom as well, including pixel-read functions for the two image inputs (e.g. getr1w(x,y), getz2b(x,y) etc).
Conditions and Regions Tab
Please see 'Particle Common Controls' in the Particles chapter.
Tips for pCustom (edit)
There are more particle tips in the Tips & Techniques section.
To better visualize what the particle ID does, create a pEmitter with the emission rate set to 1 per frame. In a pCustom tool enter id/50 as red expression and if(id=4,0.3,0.1) as size expression. (source: this pigsfly post by Gringo)
In case you are looking for the docs for pCustomForce, hopefully this tip will show up in your search. The controls for pCustomForce are very similar to those of pCustom.
| The contents of this page are copyright by eyeon Software. |
