MSP8: How to: In, through & around effect

MediaStudio

Moderator: sjj1805

Post Reply
User avatar
sjj1805
Posts: 1121
Joined: Fri Oct 27, 2006 12:45 am
operating_system: Windows 10 Pro
motherboard: Hewlett Packard 2AF7
system_drive: C
32bit or 64bit: 64 Bit
processor: 2-90 gigahertz Intel Core i5 4460S
ram: 8 GB
video card: NVIDIA GeForce GT 705
sound card: P40D100-4 NVIDIA High Definition Audio
Hard_Drive_Capacity: 8 TB
Location: Birmingham UK
Contact:

MSP8: How to: In, through & around effect

Post by sjj1805 » Thu Nov 02, 2006 5:02 pm

Author: Terry Stetler
How to move an object like a ball around or behind portions of the background, say the columns or windows in a building, without using 3D software?

Basically this effect only requires compositing multiple layers consisting of the ball, the building and the parts of the building you want the ball to pass behind.

You start out with the picture of your building. In this case I chose Benicia, the old capital building in California;

Image

In an image editor cut out its columns and door (I used PhotoImpact 11) and paste them as a new image. Next cut out the door between them and select the background color. Now invert the selection before saving it as a *.tga, *.png etc. with transparancy. This gives you an image + alpha channel overlay of just the columns;

Image

I also exported a *.tga w/alpha channel of the globe object from Cool3D Production Studio;

Image

Now these were all assembled on the MSP8 timeline, or MSP7 with appropriate changes. I used a 2D moving path to both align & scale the columns with the building. The ball was placed on a track between them;

Image

and the globe animated using a moving path;

Image

The globe starts out of frame to the left and large, then shrinks as it moves to a point just to the left of the left column. It then bounds back & forth twice before moving out of frame to the right and large again.

Note the repeating keyframes in the middle that are used to make the ball bound back & forth. I only keyframed the first and last of these, copy/pasting their settings to the other alternately placed ones (Lt/Rt/Lt/Rt) for consistancy.

As long as the globe is in front of the building or in the columns alpha channel (between them) it's visible, but as soon as it exits the alpha channel and into the columns image data it's \"behind\" them.

When exported you get this (right-click + Save As please);

http://digitalvideo.8m.net/globeanim.wmv

Poof!!

If you export an animated object from C3DPS or whatever using a 32 bit *.avi or *.tga image sequence the effect would be even cooler.

If the background were a video file that doesn't pan etc. just save a single frame and cut out only that portion of the background that the animated object would pass behind for use as the overlay. Now you can have people walking by while it \"invades\" their space :D

Another alternative is to do the compositing in Video Paint. This has a steeper learning curve, but is more flexible in that it lets you create video mattes for those times when the background object isn't stationary in the shot.

More on that in another tutorial :D

Post Reply