For volumetric capture you need to apply the pointcloud filters. Depth sensors are not very precise, therefore they produce a lot of inaccurate depth data. These inaccuracies need to be completely cleaned in order to have a correct volumetric video.
In simple terms, your goal is to record only the most accurate depth data. Don’t be afraid of the changes the filters do – it will look like you’re deleting a lot of important data, but this is the only way to capture a good volumetric video.
Applying the pointcloud filters
To get the best view possible, you also need to adjust the pointcloud filters. These filters can sharpen your capture, create smoother edges or surface.
- To make these changes, scroll down to the Pointcloud Filters section and click the checkbox enable filters
- To adjust the intensity of filters move the slide bar to the left or right:
The most important filters are Noise Reduction and Steep Depth Removal. We will now lead you through the steps to apply these filters and later on, we will show you the rest.
- Firstly, in Calibration tab, you will need to scroll down to the Pointcloud Filters section and click Enable Filters:
Noise reduction filter
Cleans randomly positioned points in small groups. You can adjust the density of the group of these points, distance, and how many iterations (times) noise reduction filter will be applied.
- Zoom in your 3D view.
- Enable the Noise Reduction filter
- Slide the Density, Distance and Iterations bars to the biggest value at the right:
See the Noise reduction filter in action:
Steep Depth Pointcloud Removal
Surfaces facing depth camera are captured very well. However, surfaces that go from the edges forward is very inaccurate. That’s why Steep Depth Removal is the most important filter of them all.
When you apply the Steep Depth Removal filter to your volumetric capture, it may look like it cleans a dramatic amount of data, but actually the removed data is too inaccurate to create a good volumetric video. We recommend to use this filter at 100% in most of the cases.
- Scroll down in the Pointcloud Filters section and turn on the Steep Depth Pointcloud Removal filter:
- Move the Intensity slide bar to 100%
This is the Steep Depth Pointcloud removal filter in action:
Both of these filters need to be used to get the best results for your volumetric capture. Noise Reduction and Steep Depth Removal filters are the most important ones.
Multiple Filters Applied
You can apply more than one filter to get the most realistic volumetric capture. There are various possible filter combinations that you can apply. You need to decide which filters you will use by trying each one of them.
We have selected three sets of filters that we suggest to use:
- Noise Reduction + Edge Smoothing + Steep Depth Removal
- Edge Smoothing + Surface Smoothing + Steep Depth Removal
- Outline Removal + Steep Depth Removal
Removing the floor
If you want to upload your volumetric capture into a volumetric environment, you may want to remove the floor from your capture. This is done in the Bounding box section.
- Scroll to the Bounding box section and click the + sign. It will open your options to adjust the bounding box:
- You can adjust the X, Y, Z axes, and in the small squares next to them, the sides of the bounding box are marked.
- Select the Y axe, with a marked bottom of the square and raise the number up until the floor disappears: