Romer Absolut Arms Tutorial (Advanced)

In this tutorial you will working on scanning of a pens case (See figure)

Before reading the next point, try to guess what are the challenges in scanning this part

Challenges:

Multi color

Repeated pattern

You need to scan both interior and exterior that are separated by a thin wall

For scanning part with repeated feature, marker can be added to help for the scanning and alignment

Sticker marker is available for this purpose

Add the stickers in both the interior and exterior structure at a random manner

For scanning multi color part, you will need to adjust the exposure limit accordingly via RDS control panel

First you need to start by setting the exposure which is suitable for one color (Green)

You will need to switch the exposure limit back and forth to scan the entire case

Placed the pens' case into the scanning table

Make sure that your exposure limit is set to scan green color

Start scanning the exterior front, interior front of the part, and the base of the case as shown in the figure. Note: Front is side that facing you

You will get a partial scan of the object (See figure)

You don't need to force scanning the back section as you may end up with misaligned scan result or scan with a lot of noise

After you finish scanning the green color section of the object, don't push the Ok button (Don't turn on the mesh buildup wizard)

Open the RDS control panel and switch the exposure limit to the one suitable for scanning yellow color

Make sure to close RDS control panel

Continue running the scan, but now try to scan the section with yellow color

You should be able to get a complete scan with both color now (See figure)

You don't need to force scanning the back section as you may end up with misaligned scan result or scan with a lot of noise

When finished, run mesh buildup wizard for combining the mesh file

Normally, Hexagon Arms should produce results that are well align

However, when scanning a part with thin and repeated feature like this, there are chance of that there are some miss-alignment on the results (See figure)

Use the Best-Fit Aligning (The third under Mesh Buildup Wizard) for aligning of scan results which are not align well

In worst case scenario when the misalignment cannot be resolved, unselect the misaligned scan file under Data Preparation (The first under Mesh Buildup Wizard) and continue the file combining process without it

After you finish with the Mesh Buildup Wizard, you can delete the unselected file

Rotate the object so that you can scan the object from different angle

Redone step 4 to 6 to get a scan of the object from different angle

Make sure that there are common scan area between the scans to allow for alignment

If you face a challenge scanning the interior section, it is recommended to laid down the part in the table with a support support structor underneath so that you scan scan it in an angle (See figure)

Turn the part upside down so that you can scan the bottom section of the base

Follow the procedure explained in step 4 to 6 to scan the bottom section of the base

Make sure that there are common scan area between the scans to allow for alignment

Performed part alignment by using the marker as reference points for the alignment

Make sure to check carefully if both scan results have been align properly. Due to the repeated feature and thin wall, the part alignment may not working properly. If you don't get a good alignment, redone the process by adding more reference points

When you done, analyze the scan result for any missing scan. If you found any rerun step 7 and 8 to get a complete scan

Use Mesh Buildup Wizard for combining multiple scan results

Before running the mesh buildup wizard save the file under different name. You may need to go back depend on the result

Run the mesh buildup wizard to combine the mesh file

Use Data editing to remove any noise or unwanted scan

Use Best fit alignment if there is still misalignment between scan data

Use HD Mesh Construction for merging the scan results

You may wat to try different combination level of HD filter, Noise reduction level, and Fill Holes

Below are some example of the merging result based on different noise reduction level

Strong noise reduction level => Too much noise is removed. You may see a lot of holes on this result

Weak noise reduction level => You most likely will get a watertight result. However, the surface may be a bit rough

Medium noise reduction level => You will get a result in between

If you find some small inaccuracy in the scan, don't worry the next step will explain how to deal with those

If there is small hole in the combined result, as shown in the figure, you can use the fill hole option

Before running the fill hole option, you need to run the healing wizard

The healing wizard can be access via Polygon > Healing Wizard

Select the scan data where you want to apply the healing wizard. Then click the check mark

If you get a warning saying that the software is failed to heal some singularities select try again

Keep running the healing wizard until the count showing a small number (1-2 digits). If you no longer have option to select try again, you can rerun the process

The fill hole option can be accessed via Polygon > Fill Hole

Select the boundary of the holes. Then click the check mark

If you see a small bump on the combine scan as shown in the figure, you can erase the bump and use fill hole option to fill the hole

To erase the bump you need to re-run the mesh buildup wizard.

Use the data editing feature to remove the bump

After you remove the bump, select the check mark under mesh buildup wizard without going through the data merging process

When asked "Do you want to run the remain stage?" select skip

Use the fill hole method explained in the previous step

In case if you have a large hole or bump where the fill hole option cannot fill accurately, you will need to re-scan that particular area

For re-scan, it is better to start using the file before they are combine. If you already perform a parts combine and you use the file for another combine, you will lose accuracy. Remember the file you save at step 9 before you do the part combine.

If you have a bump you will, need to delete the area where the bump will be (See previous step for more detail about the deletion process). As now you are using un-combine model, you may want to open the combine file side by side to have a better idea where the bump location

Run another scan on the area where you have the hole / bump. Then align the new scan with the old scan result

You don't need to scan a large portion, just focus on the region that need to be re-scan

Rerun the mesh buildup wizard to combine the scan