Light cache examples
Example 1: The Subdivs parameter
Example 2: The Sample size parameter
Example 3: The Scale parameter
The Subdivs parameter controls the number of rays that are shot into the scene, and the "noise" quality of the light cache samples.
Here is a scene rendered with different settings for the Subdivs parameter, all other settings are the same.
The Sample size parameter controls the size of the individual light cache samples. Smaller values produce a more detailed lighting solution, but are noisier and take more RAM. Larger values produce less detail, but take less RAM and may be faster to calculate.
Here is a scene rendered with different values for the Sample size parameter. All other values are the same.
The Scale parameter determines whether the Sample size and Filter size parameters are in screen space, or world space.
In the table below, the Screen scale was used, and the scene was rendered with different image and world sizes. The Sample size was constant for all images - the default 0.02.
Scene scaled down to 50% Normal scene Scene scaled up to 200% Resolution 250x300 Resolution 500x600 Resolution 1000x1200
In the table below, the World Scale mode was used. Again, the scene is rendered at three different resolutions and scales, but with the same light cache parameters. The sample size was set to be 1/5th of the sphere radius in the scene at normal scale.