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Shadow Parameters

Shadow parameters control the way shadows are calculated in a scene. The default settings are usually sufficient, but here's a list in case you need to tweak them:

  • Bias controls how close to an object a cast shadow begins. Lower values cause the shadow to move closer to the object. If a shadow makes an object look like it's floating, the Bias setting is too high.

  • Size controls the sharpness of the edge of a shadow. It measures the number of pixels squared used in the bitmap that generates the shadow. If shadows appear fuzzy along the edge, then the size is too low. Higher values produce cleaner edges.

  • Sample Range controls the sharpness of shadows by averaging different-size areas of the shadow map. If a shadow smudges, streaks, or creates moiré patterns, the Sample Range setting is probably too high. A Sample Range setting that is too low creates jagged shadows. Recommended values are between 2 and 5. You can also offset a high value by increasing the size of a shadow map or the amount of its bias.

  • Absolute Map Bias determines how the map bias is computed in relation to the rest of the scene. If you render an animation and notice that the shadows flicker when you replay it, try checking this option to end the flicker.

  • Max Quadtree Depth controls the accuracy of ray-traced shadows. Lower values use less RAM and take longer to render. Higher values use more RAM but render faster. If a ray-traced shadow does not look accurate enough, increase this setting by just one or two levels.

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