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The captured data will be used throughout the entire animation to ensure that the number of strands for a given face remains constant during animation. When the Distribution parameter is set to Per area, this specifies the frame at which the source object is captured to calculate the face area. Every triangle face has at least one strand. The area of the triangle faces (which is used to compute the number of strands for each face) is taken at the frame specified by the Ref. For example, if the the system units are in meters, this parameter specifies the desired number of strands per square meter if the system units are centimeters, it specifies the number of strands per square centimeter and so on. Per area – Specifies the number of strands per squared scene unit. Every triangle will generate the specified number of fur strands. Per face – Specifies the number of fur strands per triangular face of the source object. This section determines the density of strands over the source object. Rate – Specifies the rate at which the detail adjustment is applied, starting from the distance specified in the Start distance parameter. After that V-Ray decreases the density and increases the thickness of the strands by a factor of two for every n units of space specified by the Rate parameter.
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Up to this distance the fur will be generated as specified by the user. Start distance – Specifies the distance from the camera at which V-Ray is going to start implementing the level of detail adjustment. Second, it helps reduce animation flickering of very fine fur strands when they are far from the camera. This parameter helps for two things: First, it conserves memory by decreasing the detail where it is too far to be visible. This is done by decreasing the density of the fur strands and increasing their thickness. When enabled, V-Ray generates less fur geometry for parts of the scene which are far away from the camera. The more straight the strands are, the less segments are needed for a smooth result. by the gravity, bend, curl parameters and others). More segments are usually needed when the strands are curved (e.g. More segments make the strands smoother, but also add to the render time. Knots – Fur strands are rendered as several connected straight segments this parameter controls the number of segments.