From: Changhee Han (changhee++at++ict.usc.edu)
Date: 06/15/2001 11:54:55
Dear performer people:
Thank you especially all who responded to my stupid previous question.
I have a still problem. So please let me know your valuable idea.
What I want to make is that:
Making audiences to see the original demostration image, I(an agent) want to
do my own computation in my memory. For doing this, Back buffer can be used
for the audience and Auxilary buffer can be used for me(an agent).
Like in performer manual, saying pfDraw() can be called more than twice, I
can use 2 times drawings onto BACK and AUX buffers in one drawing callback
function by using chan->setTravFunc().
In this case, the image for audience looks like no lighting ghost city (most
of images are black and samll center places get only light like having
fog(?))
When I do this purpose by vega function like vgAddFunc() with some part of
above my whole procedures, the image for audience seems to be drawn always
correctly.
But because my purpose needs 2 times drawing, based on my poor background
(never taken graphics course, I will), I think vega DRAW callback, not post
or pre, function should be needed. Or there will be some way for this by
only using vgAddFunc, which I didn't know before. Based on my current
knowledge, it can have only pre and post drawing callback function.
Because of poor english, please let me summarize.
Audience should see correct original demo image. I need some computation in
another place(buffer).
By performer channel draw function like setTravFunc, two times drawings can
be done. But by some reason maybe with bug from our code, the image is
blacken.
It will be more stable to know vega DRAW callback fuction, meaning that I
want to do two times drawings inside vega function.
Thanks in advance,
changhee
This archive was generated by hypermail 2b29 : Fri Jun 15 2001 - 11:52:03 PDT