I have an image sequence formatted in .tga with an alpha channel, 32 bit, that blinks transparent to opaque. What I'm looking to do is put the numerical value of 0-1 from the alpha of the image sequence and apply it to other attributes of my animation.
I know the alpha works, because I have the image sequence plugged into a lambert and it's transparency blinks.
I've tried a whole ton of things (using the connection editor) but nothing seems to work. The numerical value always seems to stay locked (on the attribute that the alpha is connected to) at either 1 or 0 throughout the image sequence animation.
The color or the alpha of an image is not a single value, so if you want to get one value that you can use for something else, as in for example, a the translation of an object, you have to tell Maya which pixel to look at. Maya has the colorAtPoint command for this purpose.
Here's an example of an expression that will set the .translateY of a cylinder to the alpha value of a texture.