Light sampling

In this example we are demonstrating the sampling features in relation to light objects.

Usage

Execute in the BlenderProc main directory:

blenderproc run examples/basics/light_sampling/main.py examples/resources/camera_positions examples/resources/scene.obj examples/basics/light_sampling/output

  • examples/basics/light_sampling/main.py: path to the python file.

  • examples/resources/camera_positions: text file with parameters of camera positions.

  • examples/resources/scene.obj: path to the object file with the basic scene.

  • examples/basics/light_sampling/output: path to the output directory.

Visualization

Visualize the generated data:

blenderproc vis hdf5 examples/basics/light_sampling/output/0.hdf5

Steps

Light sampling

# Define a light
light = bproc.types.Light()
light.set_type("POINT")
# Sample its location in a shell around the point [1, 2, 3]
light.set_location(bproc.sampler.shell(
    center=[1, 2, 3],
    radius_min=4,
    radius_max=7,
    elevation_min=15,
    elevation_max=70
))
light.set_energy(500)

The focus of this example is the sampling of a location via the sampler.shell module which allows one to sample locations on a shell.

  • Sample location in a spherical shell, by setting the center, the minimum and maximum radius and the minimum and maximum angle of elevation in degree.

  • Set the light energy to 500