raster data expressions

[Dan Ebberts]

To sample the pixel data of a camera view (is that what you’re asking?) you’d have to turn the comp into a precomp and drop it as a layer into another comp, where you could use sampleImage()on it to get at the pixel data. You’ll get back the averaged RGBA values for a rectangular area that you specify. Then you should be able to use rgbToHsl() to do the conversion (I think).

Dan

[Ben Insler]

Gotcha. Thanks.

Turns out I’m using AFX 6.5 (i know…I know…), and that function wasn’t introduced until CS3. So I’ve come up with a new idea for driving the effect I’m looking for, but I’m having trouble with the driving expression. Can you have one expression, in one layer, drive many other layers. For example, if I have 10 solids (solid01 – solid10) in compA, and another solid (driver01) in CompB, can an expression use driver01.rotation to control the rotation of all 10 solids, without writing an expression for each?

I was hoping to do something along the lines of this in the rotation attribute of the driver solid (and I don’t know if the syntax is write here, just using it as an example):

for(i = 1, i<=10, i++) comp("compA").layer(i).rotation = rotation; The results of this don't calculate onto solid01 - solid10. However, if I write an expression for each solid's rotation in compA referencing the driver's rotation, everything works. Any way to just have one expression drive all? Thanks again! Ben

[Dan Ebberts]

Nope, sorry. An expression can’t control anything except the property to which it’s applied.

Dan