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Depth of Field TagIn nature our eye can only focus on one object at the same time. All other object which are closer or farer away from the point of focus will appear blured. A normal rendering displays near objects as sharp as far object but since our eye isn't used to that it might appear unnatural. The effect that very close and very far away objects get blured is called depth of field or shorter DOF. If you add the Depth of Field Tag to your camera object Cheetah3D will render your scene with the depth of field (DOF) effect. See the small gif animation below to see the difference between a sceen without DOF and with DOF.
The caustic tag works closely together with the "caustic photons" property of Light object. In the light object you can specify how many photons your light source emits. The photons are traced through the scene and are stored at the surfaces which they hit. The collections of all the photons in the scene are called the photon map. After the photon tracing path the renderer collects the photons in the nearby area of any pixel and calculates the light intensity at that point. To render caustics it is important that as many photons as possible hit the reflective or transparent surfaces and get collected in the photon map. If to less photons hit these material you will get quite ugly caustics as you can see on the first image below. Increasing the number of shot photons will cure that problem. Tips:
Attention: You can only add a caustic tag to a camera object. Properties
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