pysoltrace not plotting heat flux data for virtual stage

[oriolgalceran]

Hi,

I'm trying to plot the heat flux data for a virtual stage between my heliostats and collector. In the 3d plot it works as expected:

However in the 2d heat flux plot everything seems at zero:

Here's my stage declaration:

sensors = PT.add_stage()
sensors.is_virtual = True
sensors.is_multihit = True

ela = sensors.add_element()
ela.position = Point(0,0,5)
ela.aim.z = 0.
ela.aim.x = 0.
ela.aim.y = 0.
ela.optic = opt_abs
ela.surface_flat()
ela.aperture_rectangle(10,10)

I tried with and without multihit and nothing changes. The reason I've added an optic even if it's a virtual stage is that it crashes without it.

On the plot_flux function I've tried with absorbed_only True and False and nothing changes either.

Any tips? Thanks in advance