Nutcracker, new effect: user_defined. Do you want to create your own animation c

smeighan

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Would you like to write your animations? The new effect, user_defined allows you to do this.

The audience for this effect will be anyone who has some programming knowledge. You are going to provide a code snippet in the PHP language.

When you select user_defined, the Nutcracker will call a routine called user_defined.

here is the wrapper for the call
$maxFrame=80;
Code:
for($frame=1;$frame<=$maxFrame;$frame++)
   for($s=1;$s<=$maxStrand;$s++)
       for($p=1;$p<=$maxPixel;$p++)
             $rgb=user_defined($frame,$s,$p,$maxFrame,$maxStrand,$maxPixel,$user1);



So your job is to create code that will return a rgb value for every frame, strand and pixel.






Lets have some examples:
Example #1
Code:
if($frame%4==0) $rgb=hexdec("#FFFFFF");  // WHITE
if($frame%4==1) $rgb=hexdec("#FF0000"); // RED
if($frame%4==2) $rgb=hexdec("#00FF00"); // GREEN
if($frame%4==3) $rgb=hexdec("#0000FF");  // BLUE



hexdec(string) converts hexadecimal string into a decimal.

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER1
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 200
sparkles 0
param1 1
param2 2
seq_duration 2
php_program if($frame%4==0) $rgb=hexdec(\"#FFFFFF\"); if($frame%4==1) $rgb=hexdec(\"#FF0000\"); if($frame%4==2) $rgb=hexdec(\"#00FF00\"); if($frame%4==3) $rgb=hexdec(\"#0000FF\");
submit Submit Form to create your effect
OBJECT_NAME user_defined















Example #2
Code:
$rgb=0;
if($s%2==0)
{
if($p<=$frame)
$rgb=hexdec("FF0000");
}
else if($s%2==1)
{
if($p>=($maxPixel-$frame))
$rgb=hexdec("0000FF");
}

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER2
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 100
sparkles 0
param1 1
param2 2
seq_duration 2
php_program $rgb=0; if($s%2==0) { if($p<=$frame) $rgb=hexdec(\"FF0000\"); } else if($s%2==1) { if($p>=($maxPixel-$frame)) $rgb=hexdec(\"0000FF\"); }
submit Submit Form to create your effect
OBJECT_NAME user_defined









Example #3
Code:
$H=$S=$V=0;
if($s%2==0)
{
if($p<=$frame)
   {
   $H=$p/$maxPixel;
   $S=$V=1;
   }
}
else if($s%2==1)
{
if($p>=($maxPixel-$frame))
   {
   $H=1- ($p/$maxPixel);
   $S=$V=1;
   }
}
  $rgb=HSV_TO_RGB ($H, $S, $V);

Now we get to using a function that will use HUE, SATURATION and VALUE. H is a value between 0 to 1.0. This varies the hue through the color specturm.
$S, saturation, is a 1 if we are fully saturated. S=0 means we have a WHITE. $V is the brightness value. $V=1 full brightness, $V=0 = black.


H,S,V is much better for creating animations because of the ease of sliding through the colors. I wrote a function, HSV_TO_RGB to change HSV into an rgb value.

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER3
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 100
sparkles 0
param1 1
param2 2
seq_duration 2
php_program $H=$S=$V=0; if($s%2==0) { if($p<=$frame) { $H=$p/$maxPixel; $S=$V=1; } } else if($s%2==1) { if($p>=($maxPixel-$frame)) { $H=1- ($p/$maxPixel); $S=$V=1; } } $rgb=HSV_TO_RGB ($H, $S, $V);
submit Submit Form to create your effect
OBJECT_NAME user_defined











Example #4
Code:
$s_ratio=$s/$maxStrand; $p_ration=$p/$maxPixel;
$H1=sin($s_ratio) * cos($p_ratio);
$H = $H1 * $frame;
if($H>1) $H=$H- intval($H);
$S=$V=1;
$rgb=HSV_TO_RGB ($H, $S, $V);

We can use math functions (sin, cos .etc). We need to make sure $H is never greater than 1.

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER4
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 200
sparkles 0
param1 4
param2 2
seq_duration 2
php_program $s_ratio=$s/$maxStrand; $p_ration=$p/$maxPixel; $H1=sin($s_ratio) * cos($p_ratio); $H = $H1 * $frame; if($H>1) $H=$H- intval($H); $S=$V=1; $rgb=HSV_TO_RGB ($H, $S, $V);
submit Submit Form to create your effect
OBJECT_NAME user_defined











Example #5


Code:
$s_ratio=$frame*$s/$maxStrand; $p_ration=$frame*$p/$maxPixel;
$H1=sin($s_ratio) * sin($s_ratio) +  cos($p_ratio)* cos($p_ratio);
$H = $H1 * $p/$maxPixel;
if($H>1) $H=$H- intval($H);
$S=$V=1;
$rgb=HSV_TO_RGB ($H, $S, $V);

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER5
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 200
sparkles 0
param1 4
param2 2
seq_duration 2
php_program $s_ratio=$frame*$s/$maxStrand; $p_ration=$frame*$p/$maxPixel; $H1=sin($s_ratio) * sin($s_ratio) + cos($p_ratio)* cos($p_ratio); $H = $H1 * $p/$maxPixel; if($H>1) $H=$H- intval($H); $S=$V=1; $rgb=HSV_TO_RGB ($H, $S, $V);
submit Submit Form to create your effect
OBJECT_NAME user_defined









Example #6




Code:
$rgb=hexdec("#FFFFFF");
$H=$S=$V=0;
$p_half = $maxPixel/2; // find half way point going down tree
$p2=$p*2;  // double speed of pixel movement
if($p2<$p_half) $p_working = $p2;
else $p_working = ($p*2-$p_half);
if($s%2==1)
{
   $H=$p_working/$maxPixel;
   $H = $H*$frame/$maxFrame;
   $S=$V=1;
}
else
{
   $H=1-$p_working/$maxPixel;
   $H = $H*$frame/$maxFrame;
   $S=$V=1;
}
$rgb=HSV_TO_RGB ($H, $S, $V);
return $rgb;

array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER6
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 200
sparkles 0
param1 4
param2 2
seq_duration 2
php_program $rgb=hexdec(\"#FFFFFF\"); $H=$S=$V=0; $p_half = $maxPixel/2; // find half way point going down tree $p2=$p*2; // double speed of pixel movement if($p2<$p_half) $p_working = $p2; else $p_working = ($p*2-$p_half); if($s%2==1) { $H=$p_working/$maxPixel; $H = $H*$frame/$maxFrame; $S=$V=1; } else { $H=1-$p_working/$maxPixel; $H = $H*$frame/$maxFrame; $S=$V=1; } $rgb=HSV_TO_RGB ($H, $S, $V); return $rgb;
submit Submit Form to create your effect
OBJECT_NAME user_defined











Example #7


Code:
# function user_defined($frame,$s,$p,$maxFrame,$maxStrand,$maxPixel,$param1,$param2,$start_color,$end_color) 
$rgb=hexdec("#FFFFFF");
$H=$S=$V=1;
$slice=$param1; // use first parameter passed in from user
$slice_size=$maxPixel/$slice;
$H0 = (($frame% $slice) * $slice_size);
$H=($p+$H0)/$maxPixel;
if($H>1) $H = $H-intval($H);


$rgb=HSV_TO_RGB ($H, $S, $V);
//echo "<pre>f,s,p=$frame,$s,$p. slice_size=$slice_size. H0=$H0, H=$H</pre>";
//echo "<pre> maxP=$maxPixel. H,S,V=$H,$S,$V, rgb=$rgb</pre>";


return $rgb;
Here you see we are using the passed in parameter from the user form, $param1. You have 4 variables you can use:
$param1, $param2, $start_color, $end_color.


Also, see how to debug your code by outputting a echo "<pre>stuff to see</pre>\n"; These debug statements are currently commented out.


array_to_save
username f
user_target ZZ_ZZ
effect_class user_defined
effect_name USER7
window_degrees 180
start_color #FFFFFF
end_color #FFFFFF
frame_delay 200
sparkles 0
param1 3
param2 2
seq_duration 2
php_program 1) $H = $H-intval($H); $rgb=HSV_TO_RGB ($H, $S, $V); //echo \"
f,s,p=$frame,$s,$p. slice_size=$slice_size. H0=$H0, H=$H
\"; //echo \"
maxP=$maxPixel. H,S,V=$H,$S,$V, rgb=$rgb
\"; return $rgb; ># function user_defined($frame,$s,$p,$maxFrame,$maxStrand,$maxPixel,$param1,$param2,$start_color,$end_color) $rgb=hexdec(\"#FFFFFF\"); $H=$S=$V=1; $slice=$param1; // use first parameter passed in from user $slice_size=$maxPixel/$slice; $H0 = (($frame% $slice) * $slice_size); $H=($p+$H0)/$maxPixel; if($H>1) $H = $H-intval($H); $rgb=HSV_TO_RGB ($H, $S, $V); //echo \"
f,s,p=$frame,$s,$p. slice_size=$slice_size. H0=$H0, H=$H
\"; //echo \"
maxP=$maxPixel. H,S,V=$H,$S,$V, rgb=$rgb
\"; return $rgb;
submit Submit Form to create your effect
OBJECT_NAME user_defined







Well, have fun creating your own animation effects. If you find a cool one, please post it. I will add it into the effects library.


thanks


sean
 
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