Please help with volume rendering preset

[gzt036]

In presets.js it has a collection of parameters to be used in creating a CT 3D actor by calling
applyPreset(actor, preset);

The question I have is How to adjust these parameters to make a proper 3D volume rendering. For example, the CT-Bone preset below will pick up Bone pixels and show it in red-orange color and semi transparent way. I would like to be able to disable the transparency and show it in a more nature color (e.g,. yellow or gray). How should I change the preset?
{
name: 'CT-Bone',
gradientOpacity: '4 0 1 255 1',
specularPower: '10',
scalarOpacity: '8 -3024 0 -16.4458 0 641.385 0.715686 3071 0.705882',
id: 'vtkMRMLVolumePropertyNode3',
specular: '0.2',
shade: '1',
ambient: '0.1',
colorTransfer:
'16 -3024 0 0 0 -16.4458 0.729412 0.254902 0.301961 641.385 0.905882 0.815686 0.552941 3071 1 1 1',
selectable: 'true',
diffuse: '0.9',
interpolation: '1',
effectiveRange: '-16.4458 641.385',
}

Is there any place explain these parameters and how it should be defined?

[FMCalisto]

Did you solve this issue?