waveform3d converts music or audio to a 3D STL file which can be printed by a 3D printer. It is possible to either retrieve information online (through The Echo Nest services) or convert a local file stored on the hard drive.

The output can be:

• waveform
• pitches/timbre list
• frequency components (i.e. audio spectrum)

• numpy
• librosa
• pyen
• stl_tools

Create a 3D model of the waveform of the song "No Surprises" by Radiohead:

from waveform3d import Waveform3d
wf = Waveform3d()

wf.online_music_3d("Radiohead", "No surprises")

Create a 3D model of the pitches of the song "No Surprises" by Radiohead:

wf.online_music_3d("Radiohead", "No surprises", mode="pitches")

Create a 3D model of the spectrum of the file "voice.wav" contained in the "data" folder:

wf.local_audio_3d("data/voice.wav", mode="stft")

• en_api_key: The Echo Nest API Key. It is possible to activate one here.
• output_folder: the name of the folder where the STL files will be exported
• height_Y: the height of the final model along the Y axis (i.e. its depth)
• height_Z: the height of the final model along the Z axis (i.e. its "vertical" height)
• ma_window: number of samples used by the moving average to process the waveform (for local files only)
• depth_factor: number of times a single STFT row is repeated on the Y axis (for local files, STFT mode only)
• min_absolute_value: the minimum height on the Y axis of the waveform
• n_waveform_bars: number of continous bars that will be merged. By varying this parameter it is possible to create an effect similar to the Soundcloud waveform with "squared" bars
• scale: scales the height (surface) of the resulting STL mesh. Tune to match needs (see here)
• mask_val: any element of the inputted array that is less than this value will not be included in the mesh (see here)

• Implement "more three-dimensional" shapes, such as circles/squares etc
• "Jewelry" option that will include holes in the 3D model
• Implement the option of including text (e.g. name of the track, text of the voice recording, etc) on the 3D model

In case of a "ValueError: zero-size array to reduction operation maximum which has no identity", try reducing the mask_val in the settings.