Away3D Forum Recovering distance from distanceBased depth map

Jonathan, Newbie
Posted: 24 April 2014 05:04 PM Total Posts: 7

As the title says I would like to recover the original distance from a distance based depth map. I understand that the code used to generate the map is located in distanceMapPass.as but I have a hard time finding the code necessary to revert from the tex component back to the original distance.

Anyone can help with this?

code = “dp3 ft2.z, v0.xyz, v0.xyz \n” +
“mul ft0, fc0, ft2.z \n” +
“frc ft0, ft0 \n” +
“mul ft1, ft0.yzww, fc1 \n”;

if (_alphaThreshold > 0) {
code += “tex ft3, v1, fs0 <2d,”+filter+”,”+wrap+”>\n” +
“sub ft3.w, ft3.w, fc2.x\n” +
“kil ft3.w\n”;
}

code += “sub oc, ft0, ft1 \n”;

Jonathan, Newbie
Posted: 25 April 2014 04:22 AM Total Posts: 7 [ # 1 ]

Nevermind, a simple dot product is all it took.

theMightyAtom, Sr. Member
Posted: 25 April 2014 08:21 AM Total Posts: 669 [ # 2 ]

I thought the pixel value was the distance?

gonchar, Newbie
Posted: 25 April 2014 05:01 PM Total Posts: 7 [ # 3 ]

Please check out Filter3DHDepthOfFFieldTask class

override protected function getFragmentCode():String
  {
   var code:String;
   var numSamples:uint = 1;
   
   // sample depth, unpack & get blur amount (offset point + step size)
   code =
    "tex ft0, v0, fs1 <2d, nearest> \n" +
    "dp4 ft1.z, ft0, fc3    \n" +
    "sub ft1.z, ft1.z, fc1.z   \n" + // d = d - f
    "rcp ft1.z, ft1.z   \n" + // screenZ = -n*f/(d-f)
    "mul ft1.z, fc1.w, ft1.z   \n" + // screenZ = -n*f/(d-f)
    "sub ft1.z, ft1.z, fc0.w   \n" + // screenZ - dist
    "mul ft1.z, ft1.z, fc2.x   \n" + // (screenZ - dist)/range
    
    "abs ft1.z, ft1.z     \n" + // abs(screenZ - dist)/range
    "sat ft1.z, ft1.z     \n" + // sat(abs(screenZ - dist)/range)
    "mul ft6.xy, ft1.z, fc0.xy   \n";
   
   code += "mov ft0, v0 \n" +
    "sub ft0.x, ft0.x, ft6.x\n" +
    "tex ft1, ft0, fs0 <2d,linear,clamp>\n";
   
   for (var x:Number = _realStepSize; x <= _maxBlur; x += _realStepSize) {
    code += "add ft0.x, ft0.x, ft6.y \n" +
     "tex ft2, ft0, fs0 <2d,linear,clamp>\n" +
     "add ft1, ft1, ft2 \n";
    
    ++numSamples;
   }
   
   code += "mul oc, ft1, fc0.z";
   
   _data[2] = 1/numSamples;
   
   return code;
  } 

Recovering distance from distanceBased depth map Software: Away3D 4.x

Jonathan, Newbie Posted: 24 April 2014 05:04 PM Total Posts: 7 As the title says I would like to recover the original distance from a distance based depth map. I understand that the code used to generate the map is located in distanceMapPass.as but I have a hard time finding the code necessary to revert from the tex component back to the original distance. Anyone can help with this? code = “dp3 ft2.z, v0.xyz, v0.xyz \n” + “mul ft0, fc0, ft2.z \n” + “frc ft0, ft0 \n” + “mul ft1, ft0.yzww, fc1 \n”; if (_alphaThreshold > 0) { code += “tex ft3, v1, fs0 <2d,”+filter+”,”+wrap+”>\n” + “sub ft3.w, ft3.w, fc2.x\n” + “kil ft3.w\n”; } code += “sub oc, ft0, ft1 \n”;
Jonathan, Newbie Posted: 25 April 2014 04:22 AM Total Posts: 7 [ # 1 ] Nevermind, a simple dot product is all it took.
theMightyAtom, Sr. Member Posted: 25 April 2014 08:21 AM Total Posts: 669 [ # 2 ] I thought the pixel value was the distance?
gonchar, Newbie Posted: 25 April 2014 05:01 PM Total Posts: 7 [ # 3 ] Please check out Filter3DHDepthOfFFieldTask class override protected function getFragmentCode():String { var code:String; var numSamples:uint = 1; // sample depth, unpack & get blur amount (offset point + step size) code = "tex ft0, v0, fs1 <2d, nearest> \n" + "dp4 ft1.z, ft0, fc3 \n" + "sub ft1.z, ft1.z, fc1.z \n" + // d = d - f "rcp ft1.z, ft1.z \n" + // screenZ = -nf/(d-f) "mul ft1.z, fc1.w, ft1.z \n" + // screenZ = -nf/(d-f) "sub ft1.z, ft1.z, fc0.w \n" + // screenZ - dist "mul ft1.z, ft1.z, fc2.x \n" + // (screenZ - dist)/range "abs ft1.z, ft1.z \n" + // abs(screenZ - dist)/range "sat ft1.z, ft1.z \n" + // sat(abs(screenZ - dist)/range) "mul ft6.xy, ft1.z, fc0.xy \n"; code += "mov ft0, v0 \n" + "sub ft0.x, ft0.x, ft6.x\n" + "tex ft1, ft0, fs0 <2d,linear,clamp>\n"; for (var x:Number = _realStepSize; x <= _maxBlur; x += _realStepSize) { code += "add ft0.x, ft0.x, ft6.y \n" + "tex ft2, ft0, fs0 <2d,linear,clamp>\n" + "add ft1, ft1, ft2 \n"; ++numSamples; } code += "mul oc, ft1, fc0.z"; _data[2] = 1/numSamples; return code; }

Recovering distance from distanceBased depth map

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