here is a prototype/demonstration of using your own image kernel in vdmx. rather than being an effect, this is an A/B mixer that means you can use vdmx in the ‘old skool’ way, by mixing together two video streams rather than rendering the whole stack of layers. it also has controls like a DJ scratch mixer, so as well as a crossfader, you’ve got a fader for each channel, and a fader curve control.
to use, make a layer or group for the A channel and another for the B channel, and a layer at the top of the stack for your output. trigger the qc patch in the output layer, and assign the A and B layers/groups to its video input drop downs.
if you open the qc patch, you’ll see the video inputs get resized to the output res, as image kernels don’t handle different sized inputs too well, and then all the inputs are fed into an image kernel, ie a little filter written specially for the graphics card. in that there is some basic maths for applying a variable crossfade curve, and a line that adds the two inputs together. take a look, its not so hard; i have far more trouble with doing things like translating the crossfader curves into a mathematical expression than with the code itself.
so take this as a starter for ten if you’re interested. attached below.
i have my own mixer now that does three channel mixing just how i want, and its really cleaned up my vdmx interface* let alone the directness of the processing. sweet. http://tobyz.net/tobyzstuff/diary/2007/05/spkmxr-image-kernels-are-go
- no more layer masks or fade to blacks getting in the way in the different layers and the preview window are now just post fx and not post masking/mixing fx as well.