Typical scenarios could be a small tip portion of the model missing, or some part of the model appearing thinner than the original or sometimes even a big part of the model cut out. This could happen because one of the following:
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Problems with the setup
The amount of cutting out or thinning can depend on the degree by which the setup went wrong. One assumption that IBModeler makes for the photographs taken using the rotating stand setup is that the camera lens is parallel to the axis of rotation of the disc. We can try to achieve it by levelling up the disc's plane and the camera's plane. The below image shows how IBModeler expects the disc and camera to be aligned and the scenario (in red) when the calculations could go wrong leading to cut out models.
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The missing part was marked as part of background during identifying the background screen
If the original model had parts with colors same as the background screen, then it will be marked as background by IBModeler during the process of stripping the background screen. Sometimes, light might reflect back from the backscreen on top of the model which again could give the backscreen color to parts of the model. To validate if this was the cause of the missing part in the output, have the 'save my inputs in a subfolder' option checked on the create script input dialog and checkback the bitmap images in the subfolder to see if any part of the model is marked with the background marking color. Such a type of wrong marking, even in one image, can make parts of the model disappear. -
Wrong markings during input
If you misplaced your marking on any of the image, you could end up with cut portions or thinned out models. You can use the above troubleshooting method to verify your markings and try creating the script again. -
Wrong camera callibration
See camera callibration dialog documentation in the help files to know how the camera's view angle is calculated. If the camera is not at sufficient distance from the model, we cannot use the first option of camera at infinity. And if we are using the second option, then we should cross check each of the marked images to see if the top portions of the model have been identified properly by IBModeler in each of the images.
This mostly happens due to lack of sufficient number of photographs from all angles. IBModeler allows you to create models with a minimum of five subsequent photographs. But it is hard to get a good output with such a low number of photographs unless the model is of a simple shape (for e.g. a cube shape). Depending on the complexity of the shape of the model, we should aim at providing as many photographs taken from angles 0 to 180 degrees. Usually an angle gap of 5 to 10 degrees between subsequent photographs have given good outputs. See the bottom image to see how the model starts to shape up as more and more photographs are supplied.
Since the rotating stand setup only gives the provision to take photographs while moving around the model in a horizontal plane, there might be parts of the model whose outline cannot be determined by any of the photographs and so we might not get the desired output for those hidden edges of the model using this setup. This is a limitation of the rotating stand setup and can be eliminated either by using a different setup to take photographs or trying to orient the model in such a way that all it's edges can be identified by moving the camera around the model. If it is a model with movable parts (like a toy with movable arms or legs) it would be a good idea to try to spread it's parts in different direction rather than keeping them cluttered for easily distinguishing the shapes of it's parts when viewed through different angles of rotation.
The smoothness of the edges of the model depends on the poly count level used to describe it. So to get smoother edges, try a higher poly count. This can be done while creating the mold file. Move the poly count slider to get the desired level of poly count for the model. Note that increasing the poly count of the model also means bigger file size.
If a model was created with a very high poly count (as discussed above), then it might require a lot of resources (memory and processing speed) to display it. To address this issue, you can either try creating a model with a lower poly count or you can go for creating only a section of the model, rather than creating the entire model.
At this time, IBModeler only uses two photographs to apply textures on the model. One from the front and one from the back. It tries to stretch these two images to cover up the areas on top, bottom and sides which were not visible in the front and back photographs. To work around this limitation, try to place the model at angle at which the maximum (or most important) areas of the model are covered within these two photographs.