Unexpected behavior with 3d track motion

TeetimeNC wrote on 10/15/2009, 2:11 AM

Can anyone explain why this doesn't work as expected?

All 3 tracks have 3d alpha enabled, and:

Track 1: parent to tracks 2&3.
Track 2: small yellow generated media square.
Track 3: small checkerboard generated media square, same size and position as track 2 EXCEPT z position is 1 instead of 0.

Now, using the track 1 controller I rotate the track2/3 composite 180 degrees about the x axis. Because of the z position offset between tracks 2 and 3, I expect the visible face to change from yellow to checkerboard as the composite rotates through 90 degrees. However, the checkerboard never becomes visible. Shouldn't this work?

EDIT: I also observe a "smearing" to the left as the composite passes through 90 degrees. This looks like some kind of motion blur but I have not defined any and I have motion blur bypass set for all tracks.

Jerry

Comments

Grazie wrote on 10/15/2009, 2:50 AM

What version of Vegas?

Grazie

TeetimeNC wrote on 10/15/2009, 3:27 AM

Hi Grazie. I'm using 9b. I just discovered the cause(s) of my problem. In the spirit of further documenting how dense I can sometimes be:

1. On the parent track I had parent composite mode correctly set to 3d alpha, but had the standard track composite mode set to alpha. This was the cause for the smearing.

2. I don't quite understand why this would be required, but on the bottom track, I ran the z position down until just the point where it appeared in front of track 2 item. This turned out to be -260, instead of the -1 I assumed would work.

Now, it works a treat.

Jerry