| lighting; alternatives to xinteranimate [message #34533] |
Wed, 26 March 2003 22:36  |
twright
Messages: 4
Registered: July 2002
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Junior Member |
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1. How does one produce uniform lighting of a surface, such as
topography from a DEM, during rotation. I have experimented with
idlgrlight with type set to 1, and with both a fixed light source and
one that rotates with the model, but seem to get quite variable, and
even spotlight-like, light intensities during rotation.
2. I am making animations of earthquakes seen beneath a transparent
topographic surface. At present the memory limitation imposed by my
video card limits me to about 150 frames. For xinteranimate each frame
consists of an image of both the earthquakes and topography. The
earthquakes change with each frame, but the topography remains the
same. Thus it would be advantageous to produce frames with only the
earthquakes, then play the animation using a single image of the
topography as a constant background to each frame. I figure this could
save much memory, allowing many more animation frames to be created.
Does an alternative to xinteranimate (with the same ability to control
the rate of animation) exist that could do this?
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| Re: lighting; alternatives to xinteranimate [message #34595 is a reply to message #34533] |
Sun, 30 March 2003 13:51  |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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"Thomas Wright" <twright@usgs.gov> wrote in message
news:aee1db91.0303262236.1bf58dc2@posting.google.com...
> 2. I am making animations of earthquakes seen beneath a transparent
> topographic surface. At present the memory limitation imposed by my
> video card limits me to about 150 frames. For xinteranimate each
> frame consists of an image of both the earthquakes and
> topography. The earthquakes change with each frame, but the
> topography remains the same. Thus it would be advantageous to
> produce frames with only the earthquakes, then play the animation
> using a single image of the topography as a constant background to
> each frame. I figure this could save much memory, allowing many more
> animation frames to be created.
>
> Does an alternative to xinteranimate (with the same ability to
> control the rate of animation) exist that could do this?
My Motley library at...
http://www.dfanning.com/hadfield/README.html
...includes animators implemented using various approaches with OG and
DG. None is as fast as XINTERANIMATE, but on some problems they can
use *much* less memory. They share a common playback interface, which
allows control of frame rate, looping, random access, etc. Start by
having a look at MGH_EXAMPLE_ANIMATE, MGH_EXAMPLE_DGANIMATE &
MGH_EXAMPLE_IMAGE_SEQUENCE.
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