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Scanner Man
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Object color, texture variations, highly reflective surfaces, ambient lighting and translucency to name a few. White light technology does not suffer from these same issues.
Red laser systems - Most are triangulation with 1 or 2 cameras, Some use interferometric techniques which have completely different strengths and weaknesses than the triangulation systems.
White light projection systems do have issues with color, translucency and highly reflective surfaces.
Please note that all the systems do not suffer to the same degree and allot of factors can affect if a system can measure something. So the following is a general rule but you can always find exceptions where they will work.
Laser systems that use a camera will suffer from:
Ambient light
Object Color
Highly reflective materials
translucency
Interferometric techniques suffer from:
Highly reflective materials
surface texture
translucency
White Light systems suffer from:
Object Color - (Try and measure Impregum on a white light system)
translucency
highly reflective materials