LIE through projection like Iray Decals
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Iray Decals have certain limits in handling and exporting, and handling LIE through the LIE editor is, well, only fit for easy tasks as well. If you want to add a local texture element on characters, say a scratch, mud splat, vampire bite, whatever in a specific spot you have to do it yourself.
This means exporting to an external program, re-import etc.
If we had a projection system that lets you position a decal in Daz, not Iray, then bake it into the LIE layer by command we could have arbitrary positioning.
Artists could sell elements instead of fixed position overlays.