PBR Maps
Technical specification of the maps generated by the colormass Scanner
Frequently Asked Questions (FAQ)
What is the maximum scan area and resolution?
Please find the scanner specifications here.
What is the recommended sample size for scanning?
If the material has a repeating pattern, we require a sample that includes the full pattern in both horizontal and vertical directions, plus an additional 25%. This ensures that the scan can be made tileable. For solid textures with minimal or no pattern, we recommend samples approximately 60 x 60 cm (24 in x 24 in). Although the repeat may be smaller, scanning this larger area allows for a more natural texture, provided there is sufficient variation across the surface.
We understand that larger samples may not always be available or cost-effective, especially when dealing with standard swatch sizes that are only a few centimeters or inches. Therefore, we can accommodate smaller samples if necessary.
For leathers, woods, and other natural materials that do not have a repeat due to their organic nature but still possess distinct patterns, please contact us for a consultation. We can help determine the most appropriate sample sizes for scanning. You can find information about shipping samples here.
Why is there value in the metalness? This looks like a fabric sample.
The maps we provide are parameters according to the standard Disney principled BSDF model that were fitted to the observed images captured under different illumination directions. We optimize for all the channels, even though some samples (materials) do not contain metal or are isotropic in a physical sense. However, the fitted model gets closer to what is being observed in the captured images when these maps are also optimized, as the algorithm has more degrees of freedom to tweak its appearance. Depending on the specific material we could also easily constrain these maps to be zero. However, this would yield a slightly larger fitting error (it is never possible to fit the model to the observations 100%). Our goal is to get as close as possible to the visible/observed appearance of the captured sample.
Normally the primary goal is to obtain the most realistic and accurate scans of real-world materials. This aligns perfectly with our approach. Our fitting process employs all available degrees of freedom (PBR maps) to capture the true essence of each sample.
While we provide individual PBR maps for convenience (easy use in different rendering tools), analyzing them in isolation within a traditional 3D workflow might be misleading. Instead, consider the entire set of maps as a unified entity. You should assess the final, rendered results for a comprehensive understanding of the material's appearance by directly plugging the fitted maps into your shader.
Color accuracy is very important for us. Why do you have lighting/shadows/specular components baked into the diffuse map?
Color accuracy is also one of our top concerns, and we take great care to ensure that we get the best possible data from our scanning system. This is a very deep topic, and there are a huge number of factors to consider when discussing how accuracy is measured and evaluated. Ultimately, what should be judged is the final render, rather than the isolated maps, since there are numerous shading effects that can influence color perception.
Shadows can occur in the diffuse map due to self-occlusions within the 3D structure of the surface. While it may seem strange that these are present in the diffuse/albedo map, they must be accounted for by some parameter in order for the rendered results to match the original sample. In a typical top-down 3D workflow, an artist would have these separated out into different maps for ease of editing, but the final rendered result would be very similar once all the maps are combined in a shader.
Why do you have anisotropy maps for isotropic materials?
Many seemingly isotropic materials are actually anisotropic when viewed at a small enough scale, and our scanner is able to resolve this. When viewed at a distance, the various anisotropies will average out to give the appearance of isotropy. Rather than have special cases for different types of surfaces, we always calculate anisotropy-related parameters, since their inclusion almost always increases the accuracy of the final render. (It should be noted that if a sample has particularly high roughness or low specularity, then high anisotropy values will contribute less of an effect towards the end result. Therefore, a high anisotropy value should not immediately imply that the material is highly anisotropic—it needs to be taken in context with the other parameters.)
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