Assignment 3: 3/5/2011

RGB Color Cube

The above RGB Color Cube was created with the following code:

string $name;
string $tmp;
for ($x=0; $x<8; $x++)
{
    for ($y=0; $y<8; $y++)
    {
        for ($z=0; $z<8; $z++)
        {
            $name = `shadingNode -asShader blinn`;
            $tmp = $name + ".color";//blinnShader1.color
            setAttr $tmp -type double3 ($x/7.0) ($y/7.0) ($z/7.0);
            polySphere -ch on -o on -r .03;
            xform -translation ($x/7.0) ($y/7.0) ($z/7.0);
            hypershade -assign $name;
        }
    }
}

RGB Color Wheel
$numHues = 6.0;
$w= 360.0/$numHues;//width
$s = 1.0/10.0;
$value = 1.0;
$n = 6;

for ($i=0; $i<$numHues; $i++)
{
      for($j=0; $j<$n; $j++)
     {
            $sphere = `polySphere -ch on -o on -r .3`;
            move 10deg 0 10deg $sphere;
            xform -r -ro 10deg 0 10deg;      
           $sat = $j * $s; // translate by number
           $angle = $i * $w; //rotate ball
           $hue = $angle/360.0;
           //vector $v = <<1, 2, 3>>;
           //shadingNode -asShader blinn;
           //sets -renderable true -noSurfaceShader true
            // -empty -name blinnSG;
          //connectAttr -f blinn.outColor blinnSG.surfaceShader;
          //assignCreatedShader "blinn" "" blinn "pSphere";
          //sets -e -forceElement blinnSG;
         //vector $c = hsv_to_rgb($v);
         //xform -translation ($c.x) ($c.y) ($c.z);
         //hypershade -assign $name;
     }
};

I have worked and reworked this code so many times and I don't understand it.

Artistic Color Wheel

$w= 360.0/6;//width
$s = 1.0/2.0;
$value = 1.0;

//string $sphere [];
//$sphere = `polySphere -ch on -o on -r .5`;
$a1= 0.0;
$a2 = 60.0;
$h1 = 0.0;
$h2 = 60.0;
//$angle = $w / 6;
$n= 10;
$dhue = $h2 - $h1;
$sh = $dhue/$n;
$dangle = $a2 - $a1;
$sa = $dangle /$n;

$hues[];
$hues[0] = 0;
$hues[1] = .16;
$hues[2] = .32 ;
$hues[3] = .48;
$hues[4] = .64;
$hues[5] = .8;
$hues[6] = 1;

// $hues []= { 0,.16, .32, .48, .64, .8, 1}
for ($k=0; $k<6; ++$k)
{   
          $dhue = $hues[$k + 1] - $hues[$k];
          $dangle = $hues [$k + 1] - $hues [$k];

          for ($i=0; $i,6; ++$i)
         {
                  for($j=0; $j<6; ++$j)
                 {
                          $ca = $a1 +$i * $sa;
                          $ch = $h1 +$i * $sh;
                         string $sphere [];
                         $sphere = `polySphere -ch on -o on -r .5`;
                         move $sphere 10deg 0 10deg;
                         xform -r -ro 10deg 0 10deg;
                         $sat = $j * $s; // translate by number
                         $angle = $i * $w; //rotate ball
                         $hue = $angle/360.0;
                         vector $v = <<1, 1, 1>>;
                         shadingNode -asShader blinn;
                         sets -renderable true -noSurfaceShader true
                          -empty -name blinnSG;
                         connectAttr -f blinn.outColor blinnSG.surfaceShader;
                         assignCreatedShader "blinn" "" blinn "pSphere6";
                         sets -e -forceElement blinnSG;
                         vector $c = hsv_to_rgb($v);
                         xform -translation ($c.x) ($c.y) ($c.z);
                         //hypershade -assign $name;
                 }
        }
}

I understand the basic concepts from class such as the color wheel divided into 6 parts. But no matter what I can't get the code to work. My classmates, Casey and Rachel, gave me some advice about how to fix the problem, like including these lines in the saturation for loop:

string $sphere [];
$sphere = `polySphere -ch on -o on -r .5`;

and not using xform translation or adding angles.

I understand the basic concepts on paper, but coding them into Mel is confusing. Documentation is not always helpful. I will be getting a tutor immediately.