   int volumeId;
   mat4 objectToDatasetMatrix;
   int transferFunctionRow;
-  // int transferFunctionRowCount;
 };
 
 layout(std430, binding = 1) buffer CB1

    sampleColor += currentColor;
  }  // per active object loop

  // clamp cumulatie sample value
  return clampColor(sampleColor);
}


    if (fragmentColor.w > 0.999)
      break;

    startPos_eye += step_eye;
  }  // sampling steps

