As you can see in the attached patches (MultiTrailsExample_NOGL.maxpat), my first attempt to mix the rendered trails and the video was made in the "matrix world", using jit.op to overlay the two matrices.
But I was looking to obtain the same effect in "GL world" (MultiTrailsExample_GL.maxpat), in order to achieve some performance benefit by using the GPU: I got it to work using jit.gl.videoplane.
And here come the questions:
1) in the first case (NO GL), I'm forced to send the overlayed video to a jit.pwindow, because as I try to switch to a jit.window I get lots of buffer underflow and overflow messages (actually, the video is correctly displayed, but I get this bunch of errors which I'm afraid of...).
2) in the second case (GL), it seems that the "erase_alpha" is ignored, and so I have no "motion blur" effect when the circles move. Is there a way to obtain that effect?
3) the patch works on Max 5, but it seems not to work at all on Max 6. Any ideas?
Thanks in advance