#Special Effects for TV
5 messages in this thread
Just got off the phone from Brian and he could still use some help on this
process.
What he's doing is blowing up a person by taking a video tape of a person,
going to the last frame the person exists before blowing up, then capturing
that frame. He then uses software to cut out the person.
He uses this image as a background in the 2D Shaper and traces it. In the 3D
Editor he loads this shape and tesselates it. He then maps the image of the
person onto the outline and renders the image with exploding IPAS routines.
Finally, he maps the result onto the video. Problem is, he's having trouble
aligning things up.
He's using the camera to help move the image around to get things aligned.
Also, he's rendering to 720x486x.9091.
Any thoughts? Thanks?
<< GAry responded earlier with this >>
I'm glad to hear about the succesful TV work you've been doing with 3DSr3 and
the IPAS routines. How about submitting some of that to us for our NAB demo
reel? (have you seen my msg 79006 about that?)
Here are some comments to your questions:
Re tracing… the image won't rescale when using the proxy if you've got the
BKGND-PRESERVE-RATIO switch on in the System Options dialog (and/or 3DS.SET
file). Try it… works great.
>>When I render the image I need to put it on the scene accurately so >>there
are no hits and It looks realistic.
I'm not sure what you mean by "hits". Please elaborate.
>>Any hints on Tessellating the objecting, the object needs to become >>very
small pieces or chunks.
I use edge tessallation with a value of 0 for that kind of stuff. Just do it
once (ideally).
>>Any hints on exploding the object using the explode routine I >>need to
explode the object outward like a real explosion.
There are some example files on the IPAS Disk#4 that show how to explode
outware like explosions. Best to learn from those.
Good luck and have fun!
– G
It sounds like it should be pretty straight forward. How is he having
trouble lining things up? Is it that the mapped object won't fit back in
seamlessly, or is there a camera move during the shot? If the background plate
was locked off, then lining things up should be easy, but you mentioned he was
using the camera to line things up. The cameras perspective might be screwing
things up, due to FOV and/or slight variations in angle. With a locked shot,
all adjustments should be made in an ortho viewport, and be rendered from the
same.
On the other hand, if there is camera movement, then that naturally
complicates things quite a bit. My only suggestion there would be to find out
the lens used and the distance of the subject from the camera (the first from
the camera report, the second…?) to do a basic lineup and then key every
frame for the best accuracy. This of course can be quite time consuming, but
probably neccesary for that kind of situation.
Given what you mentioned, thats all I can think of without further
details. I hope its of some help, or at least insight.
David
Off the top of my head bkgnd preserve ratio on would be the way to go. Does he
have this switch set?
John Tissavary (La Luna cie)
Ooops, just noticed Gary and Nik posted the same thing. Did Brian already try
this and it didn't work? I'm very curious about the results, I may be doing
similar effects on an upcoming project.
John Tissavary (La Luna cie)