If you are already working with, or looking at the benefits of offered by using point clouds, then Autodesk ReCap is a great tool. It comes as part of the AEC Collection and to begin a series of blogs offering tips and tricks for this product, I will give an overview of the ReCap Point Cloud Colour Settings.
ReCap allows you to change the point cloud appearance to communicate specific data about the scan more efficiently. Some methods, such as specifying colour modes, provide information about the point cloud surfaces and elevations.
Display points in the real-world colours as originally captured by a camera built into the scanner. This colour is based on RGB (red, green, blue) colour values.
Display point colours that reflect height or Z coordinates. This is a very useful mode for quickly ascertaining relative height on a large or small scale - showing the deviation in a floor slab for example.
Display Intensity by Colour
You can set point display to show intensity, which measures point reflectivity based on surface texture, surface angle, and the environment.
Display Point Normals by Colour
Display points with colours assigned to the X, Y, Z values associated with the direction of the normal for that point.
Display Scan Locations by Colour
Display the point cloud with each scan location differentiated by colour.
About Gradient Ramps
The gradient ramp is displayed on the left-hand side of the viewer when you view a point cloud in the elevation or intensity colour modes.
Depending on the current colour mode, the colours convey information such as height, normal directions or original scan locations. You can modify the number of colours on the gradient ramps, specify whether the colours are blended or distinct, or set them in order to use one of the several colour gradients, such as grayscale, reds, earth tones, or blues.
You can modify and save the gradient ramp settings that emphasize different details in the elevation and intensity colour modes. To edit your current gradient ramp or create a new one click on the settings icon in the upper left.
Editing Gradient Ramps
Once you’ve got the settings dialog set up, you’ll be able to adjust a number of variables associated with the current gradient ramp. These include selecting other default colour spectrums, adding colours to the current spectrum and removing colours from the current spectrum.
Set the Colour Ramp to a Pre-set Colour
You can select spectrum (the default) to any number of pre-set options. These include grayscale, reds, earth tone, or blues.
Add New Colour Nodes to the Ramp
To add a new colour node to the gradient ramp hover over the left edge of the gradient ramp and click the location where you want to add a colour. Once placed you can specify a different colour for the new node by clicking the colour node to open the Colour dialog box and making changes.
The ramp can be adjusted to alter the way the colours are displayed along the gradient. You can smooth blend the colours along the ramp, while any one of the 32-step, 64-step, or 256-step settings split the ramp into individual colours.
Edit Ramp Labels
Ramp labels can be adjusted at any time whilst editing a ramp. Just click on any label to get access to its settings:
'fixed' - distributes labels evenly
'floating' - allows for custom label distribution
'# of labels' - sets number of labels
'Start/End' - sets the label range
'Round values to' - sets the amount to round label value up to
Once you have finished just click save to confirm your changes.
To remove a label from the current Gradient Ramp just find the one you want to delete, click on it, and drag it off the gradient ramp.
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