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I've created a model of flapping wings. There are ribs, with bicubic
patches forming the 'skin' between the wings. The wings are generated with
a macro that takes "spread" and "flap" values to determine their position -
which can in turn be based on the clock.
What I'm trying to add now is a way to have the 'skin' stretch as if
experiencing wind resistance. To do that - I need someway to know the
motion of the wing (i.e. up or down) but I'm stumped about how to do this
since each frame is rendered individually. Is there an easy way for me to
track what the last frame rendered was, so that I can then determine which
way to stretch the bicubic patch?
Thanks all!
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Ross Del Duca <ros### [at] delducagroup net> wrote:
> I've created a model of flapping wings. There are ribs, with bicubic
> patches forming the 'skin' between the wings. The wings are generated with
> a macro that takes "spread" and "flap" values to determine their position -
> which can in turn be based on the clock.
>
> What I'm trying to add now is a way to have the 'skin' stretch as if
> experiencing wind resistance. To do that - I need someway to know the
> motion of the wing (i.e. up or down) but I'm stumped about how to do this
> since each frame is rendered individually. Is there an easy way for me to
> track what the last frame rendered was, so that I can then determine which
> way to stretch the bicubic patch?
>
> Thanks all!
Hey Ross-
Create a text file in the same folder as your .pov.
Use the #fopen statement with #read to get the value in the text file, and
with a #if statement check the previous wing position, then do with it what
you need to. Then at the end of your code #fopen and #write the new value
you want for the next frame.
example: (right in povray)
#declare wing_position = 0;
#fopen MyFile1 "wings.txt" read
#read (MyFile1, wing_position)
#fclose MyFile1
#if (wing_position = 1) // open
// do something
#declare next_position = 0;
#else // closed
// do something else
#declare next_position = 1;
#end
// povray code
#fopen MyFile1 "wings.txt" write
#write (MyFile1, next_position)
#fclose MyFile1
// this will make every other frame have an "open" or "closed" value
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