How to 3D Scan Shiny, Dark and Clear Objects: A Plain-English Guide

Why these three surfaces are hard

The physics is not in dispute, and the vendors describe it consistently.

Dark. Einstar puts it plainly: "Dark surfaces absorb most of the projected light instead of reflecting it back to the scanner's cameras." There is nothing coming back for the cameras to triangulate.

Shiny. The same page: "Glossy, metallic, or mirrored surfaces reflect light unpredictably, creating glare or overexposed spots." Too much light returns from some angles and none from others.

Clear. Revopoint's own guidance is the bluntest on this: "Light passes through transparent objects, making them invisible to 3D scanners."

Revopoint is also willing to say where the technology simply stops: "A fully mirrored surface is nearly impossible to scan, regardless of the type of 3D scanner used, because it deflects too much light away from the scanner's sensors." That is a scanner manufacturer telling you that no scanner, including theirs, will do the job — worth noticing, because the reputation of this industry is that nobody ever says it.

The fix everyone agrees on

Coat the surface so it scatters light evenly. Revopoint describes the spray as something that creates "a micron-thin layer that the 3D scanner can easily see." Creality recommends a developer spray applied from "about 150mm-200mm from the scanned part". EinScan frames it as pre-treatment "so that the projection light can reflect off the object surface diffusely". 3DMakerPro suggests "a thin layer of white powder or paint to create a diffuse surface that the scanner can detect".

If you do not have scanning spray, several vendors point at household substitutes. Revopedia suggests "a fine powder like baby or makeup powder"; Revopoint's blog adds "dry shampoo, foot spray, or skin foundation". These work on the same principle and are worth knowing about before you buy anything.

The advice everyone gives is also consistent: keep the layer thin. Revopedia says to "lightly and evenly coat the object's surface. Avoid spraying too closely or applying spray only to small local areas." Creality warns against "excessive spraying from causing sagging and affecting accuracy". PADT's guidance is "to use as little spray as needed to properly scan the part, minimizing any additional thickness caused by the powder."

The number nobody gives you

Here is the gap. Thirteen published pages were surveyed for this guide — seven from scanner manufacturers, six from resellers, service bureaus and trade publications, all listed at the end. Every one of them that discusses spray tells you to keep the coating thin. Not one of the thirteen converts that into a stated measurement error. That is a claim about the text of those pages. One of them links a video we were unable to transcribe, and it is listed at the end.

Three of them say it matters. Revopoint warns that if you do not apply a thin layer, "details will be obscured, and you may alter the item's dimensions." Creality links over-spraying to "affecting accuracy". GoMeasure3D says "If you have a heavy thick coating it will influence the accuracy of the 3D scans." Those are all true and all qualitative. None of them, and none of the other ten, turns it into a number.

That matters because the coating is not negligible, and there is a measurement.

A 2023 study in Materials tested eight sublimating scanning sprays using an automated spraying system, so that every spray was deposited under identical conditions. Its finding: "All tested scanning sprays created coatings with thicknesses in the order of tens of micrometers that were detectable by the 3D scanner Atos III Triple Scan." The measured single-layer thicknesses ran from 23.7 µm to 43.4 µm depending on the spray. The authors' own conclusion is the sentence to carry away: "The coatings must be applied carefully when accurate measurements are required."

Detectable by the scanner means exactly what it sounds like. The coating is not an invisible aid to seeing the object; on a scan of that resolution it is part of the object's measured surface.

What the manufacturers publish, and what they don't

Of the seven scanner-manufacturer pages surveyed, none states a coating thickness figure at all. The thickness numbers in the set come from elsewhere, and there are more of them than you might expect. GoMeasure3D, a spray reseller, publishes the spray maker's own specification for every product in the AESUB range — eight separate layer-thickness figures, from "approximately 0.5 to 1 microns" at the thinnest to "Layer Thickness: ~ 15-20 μm" at the thickest, with "Layer Thickness: ~ 7 μm" and "~ 8-15 μm" among them. PADT, a service bureau, puts it more loosely: published thicknesses can be "as little as a few microns thick".

None of those is an error figure, and the distinction is worth being exact about rather than glossing. A thickness specification tells you how much material the maker says the can lays down under the maker's own conditions. It does not tell you what your coat measured, and it does not tell you what that did to your part. It is still the closest anything in the set comes to a number, and a reader with that page open deserves to be told so.

This distinction is worth stating precisely, because it is easy to overstate. The resellers are not hiding the numbers — one of them publishes them. What no page in the set does is close the loop between the two: the specification describes an ideal coating, the study measured what an automated system actually deposited, and the difference between the two is a factor of several. A person with a rattlecan is not an automated spraying system. If your scan needs to be a measurement rather than a likeness, that gap is yours to manage, and nothing you will read tells you how large it is on your part.

The merchant has the number, on a different page

Revopoint is the retailer this guide links to, so it is worth being exact about what the company publishes and where.

Its blog post "How to 3D Scan Any Object" carries the warning. Apply a thin layer, it says, "or details will be obscured, and you may alter the item's dimensions."

Its Revopedia object-handling documentation — the reference page for this exact task, last edited 19 May 2026 — says only: "Use scanning spray to lightly and evenly coat the object's surface. Avoid spraying too closely or applying spray only to small local areas." Dimensions are not mentioned.

A third Revopoint blog post, which falls outside the thirteen pages surveyed here and is quoted only for what it says, gives a figure: "Scanning sprays form a layer 8 to 15 microns thick, ensuring dimensional accuracy."

So: one page from this company warns that the coating can alter dimensions, one gives a thickness and describes it as ensuring accuracy, and the documentation you would have open while actually scanning something mentions neither. We are not going to tell you what to make of that. We are telling you the information exists, and that whether you meet it depends on which page you happen to open.

Two smaller things worth knowing

"Residue-free" is doing some work. Creality says of its developer that "the developer will automatically evaporate without residue", and one scanning studio writes that the spray it uses "cleanly evaporates from the subject within a few hours and leaves no residue". The Materials study found otherwise on a mirror-like test surface: "All coatings left visible traces on the mirror-like surface. They were easily wiped off with a cloth." Different sprays and different substrates, so this is not a contradiction — but "residue-free" is a stronger word than the measurement supports, and if you are scanning something you cannot wipe, it is worth a test on a hidden area first.

Sublimating sprays are not fast. The same study measured how long single-layer coatings took to disappear: from 47 minutes for the quickest to 444 minutes for the slowest. Vendor guidance quotes much shorter figures for the drying step before you scan — Creality says "Air dry for 2-3 minutes after spraying", Einstar refers to "the 2–5 minutes dry time" — which is a different measurement from how long the coating takes to vanish afterwards. If you need the object clean by a deadline, plan against the second number, not the first.

When not to spray at all

Einstar's spray guide is the one page in the set that treats this properly, and its list is worth repeating. Do not spray "museum artifacts, historic bones, or untreated leather", because "the pigment can permanently stain delicate materials". Avoid it in "Cleanroom or Medical Environments", where "introducing fine airborne particulates is a contamination risk". Be careful with assemblies: spraying one "without perfect masking can leave residue in bearings or seals, potentially causing mechanical failure."

On handling the aerosol itself, GoMeasure3D offers the only practical note in the thirteen: "To minimize the particles in indoor space, you can spray the part in a spray booth or outdoors." Read the can before you use it indoors.

What to do instead of spraying, where you can

Several vendors point at technique before chemistry, and it is the cheaper thing to try first.

Exposure control comes up repeatedly: Creality's advice for black objects is to "Adjust the IR exposure until the previewed point cloud model is clear and complete", and Einstar suggests adjusting "the exposure level bar until the camera preview shows a slight reddish tint". Angle matters too — 3DMakerPro suggests polarising filters, and holding the scanner at an angle to a shiny surface rather than square-on is standard advice across the set.

Revopoint's documentation is also specific that whether you need spray at all depends on the scanning mode. Its table lists laser-line modes as needing no spray for matt, black reflective and metal reflective surfaces — only for transparent and specular ones — while structured-light and full-field modes need it for four of the five surface types. If your scanner has a laser mode, that is the first thing to try on a dark part.

Finally, markers. For featureless or symmetric objects, Revopedia's guidance is that markers give "Stable Tracking", "Reliable Stitching" and "Increased Accuracy: Reduces cumulative errors during long-path or large-scale scanning." A shiny featureless object often needs both markers and spray, not one or the other.

The short version

Dark, shiny and clear surfaces fail for three different optical reasons, and matte scanning spray fixes all three. Try exposure, angle, laser mode and markers first, because they cost nothing and add no material to your part. When you do spray, spray lightly — every vendor agrees on that, and they are right.

Just know what you are agreeing to. The coating is thick enough for the scanner to see, the one published measurement puts it at tens of micrometres, and no manufacturer will tell you what it does to your particular part. For a likeness, that is irrelevant. For a measurement, it is the whole question.

How this guide was made

This guide is based on a survey of thirteen published pages, plus one peer-reviewed study. The surveyed set was every page published by a 3D-scanner manufacturer, reseller, service bureau or trade publication that appeared on the first results page of two searches run on 21 August 2026 for how to scan shiny, reflective, black and transparent objects — plus both of Revopoint's own scanning-spray pages, included because Revopoint is the retailer this guide links to and leaving it out would have rigged the result.

The seven manufacturer pages: Einstar's guide to dark and shiny objects; Einstar's scanning-spray guide; EinScan's scan-spray application note; 3DMakerPro's guide to reflective, transparent and black objects; Revopoint's "How to 3D Scan Any Object"; Revopoint's Revopedia object-handling documentation; and Creality's wiki page on black, reflective and transparent objects.

The six others: GoMeasure3D's AESUB product page and its blog post on dark, shiny and clear surfaces; PADT's article on transparent materials and shiny surfaces; 3D Scanner Supply's knowledge-base article; 3D Mag's guide to choosing a scanning spray; and Arkify3D's post on shiny and transparent objects.

The study is "Comparison of Sublimation 3D Scanning Sprays in Terms of Their Effect on the Resulting 3D Scan, Thickness, and Sublimation Time", published in Materials in 2023 and available open access.

Six sources were considered and not surveyed, and it is only fair to say which: a Springer paper on sublimating coatings in optical coordinate measurement, which is paywalled; a second study on surface material and measurement accuracy, which would not load; a manufacturer page on scanning black, shiny and transparent objects with the iReal M3, which returned a "page does not exist" error on the date of the survey; two Revopoint blog pages whose content duplicated the two Revopoint pages already in the set; and a video linked from GoMeasure3D's blog post, which that post describes as reporting an analysis of adding a spray coating. We could not obtain a transcript of it.

That last one is why the claim in this guide is worded as a claim about the text of the thirteen pages. If the video states a deviation figure, the claim about the text still stands and the wider point stands less well — and you would be right to weigh it accordingly.

One further page is quoted here without being counted: the third Revopoint blog post above, which gives a layer-thickness figure. It falls outside the selection rule, so it is cited for what it says and forms no part of the survey the claim rests on.

We have not tested the products discussed ourselves. TaviGam has an affiliate relationship with Revopoint, disclosed above; that relationship does not change what we would tell a friend, and one of the observations in this guide is a mild criticism of Revopoint's own documentation. Prices are deliberately absent — check the vendor's site for current pricing and terms.