How to change wavelength beyond the visual spectrum (SWIR, MWIR, LWIR)?

[kobabulbul]

We are attempting to render images of a simple plate in the mid-wave infrared (MWIR) range using Mitsuba 3. However, Mitsuba 3 does not allow spectral ranges outside the visible spectrum by default. Below is our current film settings configuration, which doesnt work:

<film type="specfilm">
    <rfilter type="box"/>
    <string name="component_format" value="float16"/>   
    <spectrum name="band0" value="2000:1, 5700:1"/>
    <integer name="width" value="640" />
    <integer name="height" value="512" />
</film>

Our intention is to treat the MWIR range similarly to the visible spectrum, without worrying that all objects effectively become emitters in the infrared. Furthermore we want to insert our own measured BRDFs.

How can we do that?

Thanks in advance!

EDIT: Is it possible to write a Plugin for this?

[merlinND]

Hello @kobabulbul,

which doesnt work

Could you please be more specific, what error message or result are you seeing?

[kobabulbul]

It works now, idk what happened