Do another test render. Now there's much more light (don't worry if it looks over-exposed, we'll take care of it later) and there are some photons visible in the scene (Fig.07).



Go back to the Indirect Illumination settings and enable Final Gathering. Set its Accuracy to 100, Point Density to 2 and Point Interpolation to 100 (Fig.08).



Render the scene again. Now it's much better, but the picture is still too over-exposed. We need the "mia_exposure_photographic” node to fine-tune the exposure and overall look of the image (Fig.09).


Open the Quality tab in the Render Settings and make sure that the Gamma value is set to 0.454 (Fig.10).


Open Hypershade and drag the Camera you're using into the graph. Drag a new "mia_exposure_photographic” node into the graph and connect it to the camera node (Fig.11).



If you render the scene now, the picture will be all black; we need to set the exposure parameters. These are the parameters used in the scene:

- Cm 2 Factor: 2000
- ISO: 100
- Shutter: 100
- F Number: 8
- Vignetting: 11
- Burn Highlights: 0
- Crush Blacks: 1
- Saturation: 1.2
- Gamma: 1

In Fig.12 you can see a quick test render using the previous settings.