Project files: basic_finalgather.zip

This is a rendering of the scene with the default lightsettings:

Let's turn on final gather. To do this, Enable Final Gather in the Turtle render globals and Enable Sky Light. Sky Light simulates a "foggy day" look by shading unoccluded rays with the defined sky color. Also disable the default light to make sure the only light in the scene comes from the sky. Now we’re ready for a test run. Hit render and you should get this image. 

This looks much better than the with the default light, but there are still some issues with the lighting, noteably on the boxes. The problem is that the FG points in the edges affect other surfaces, making dark splotches. To remove this issue we can increase the accuracy and rays and make the smooth filter smaller.

Change smooth to 0.6, gathering rays to 3000 and accuracy to 2.0 and render.

The boxes look much better, but the render was way slower than before. 

Since the problem is solely related to the boxes, we can take advantage of Turtle’s ability to have custom FG settings for each object. We can give the boxes a higher accuracy setting while setting the rest of the room to have the fastest solution.

Change smooth back to 1.0, gathering rays to 1000, and accuracy to 1.0. Now change the Final Gather Overrides for both boxes (available in the attribute editor) to Smooth 0.6, gathering rays 3000, and accuracy to 2.0. 

The boxes still look good but the rendering time has been decreased considerably.

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