Realistic Lighting Option

By default Boxshot uses a physically–correct approach to scene rendering and computes all the light bounces to make sure the output image looks real. This is a very time consuming task and sometimes the result is not really worth the waiting time. Some scenes simply don’t benefit enough from the advanced lighting tracing and skipping this part may speed the rendering up.

Boxshot has an option for this which is called Realistic lighting and located at the bottom of the scene settings page on the left.

What Is The Difference?

Here is the scene rendered with realistic lighting enabled:

Scene rendered with realistic lighting enabled

And the same scene rendered with realistic lighting disabled:

Scene rendered with realistic lighting disabled

As you may see, the main differences are that there is no orange and green tints on the floor, the cylinder is somewhat flat and all the shadows became gray.

On the other hand, the second image took 10 times less to render!

What Exactly Is Different?

When the realistic lighting is disabled, Boxshot doesn’t do the following:

The rest is pretty much the same and all the reflections and transmissions are processed similarly regardless of the realistic lighting option state.

Note that due to the differences in lighting algorithms being used, switching the option affects the overall scene lighting. You might need to re–adjust the light sources after switching the option.

What Is The Expected Speedup?

The speedup highly depends on the scene itself. Our tests show 1.5 to 10 times faster rendering for simpler lighting, depending on the scene. The most speedup is achieved for scenes with diffuse surfaces, as this is where the most computation time is spent when the realistic lighting is enabled.

Give the option a try in draft mode and see the rendering speed difference for your particular scene.

Another way to speed up rendering, is to use gpu rendering if available. For instance, our tests show 3x speedup for the scene above.

So, Should I Disable Realistic Lighting?

If you don’t see the difference — sure!

Otherwise do a draft rendering with the option disabled and see if it still looks nice for you. If it does — go with it, as it will save you some rendering time.

Have a look at time–based rendering notes if you want to use it with time–based rendering.

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