3D compositing in Vegas planet with ring
0includes screen shots of the time line with notes .
no moving parts to this. 3D composites to one image.
The goal is to see how vegas does 2D and 3D compositing on the time line.
uploaded as wmv7 1366 x 768
how to calculate the perfect aspect ratio for vegas.
vegas accepts manual digits for pixel aspect ratios.
( 704 / 480 ) x 1.2121 ==== 1.777746667 very close to a perfect 16:9
but who wants to use 704 ?
( 704 / 480 ) x .9091 ==== 1.333346667. very close to a perfect 4:3
the defacto DVD spec. is 720 x 486 yep !
( 720 / 486 ) x 1.2000 = a perfect 1.77777777 16:9
( 720 / 486 ) x .9000 = a perfect 1.33333333 4:3
adobe Encore accepts 720 x 486 so, in vegas,
export as 720 x 486 1.2 , import the video into Encore as 720 x 486
with manual aspect selection of 1.2 then the mp2 will be a perfect 16:9 at
720 x 480 . Yeah, all authoring always results as 720 x 480 , but it will
look aspect correct as interpolated, IF the video is setup correctly , from the start.
( 720 / 480 ) x 1.1852 ==== 1.7778 very close to 16:9
( 720 x 480 ) x .8888 ==== 1.3332 very close to 4:3
why are these needed in vegas ? well, uncompressed AVI has no header
so vegas always uses a default( guess ) pixel aspect ratio upon import,
which is usually incorrect.
You must know what the source footage aspect ratio is and set it manually.
png bmp or video footage must be recognized properly on import
or it will never look right .
there is no such thng as a 1.2 non-rectangular pixel, it's just an act of interpolation
combined with the physical pixel dimensions such as 720 x 486 ,
to give a complete result that looks aspect correct.
If you look at the data per pixel there are just 3 bytes( 24 bit ) that's it.
There is no pixel aspect about it. Just an interpolation.