Shader: "birch"

"birch"

ClassColour
Synopsis A version of the general "wood" advanced wood colour shader with pre-defined values appropriate to a birch-like appearance. The best way to get a particular wood effect is to start with the pre-defined wood shader which is closest to the effect you want, and then gradually alter arguments until you are happy with the result.
Arguments

"scale" Description: An overall scaling factor which determines the radius difference of two adjacent rings. 0.01 means that there are 100 rings per unit length along the trunk radius. Choose a value appropriate to the units in which your geometry is modelled. The default value is appropriate for modelling in metres.
Default:0.005
Hint:[ 0.01, 1000 ]
"trunk centre" Description: The orientation of the tree from which the wood is taken is specified by a point which lies on the axis in argument "trunk centre" and a direction vector pointing along the axis of the tree in argument "trunk direction".
Default:(0.0, 0.0, 0.0)
Hint:-
"trunk direction" Description: The orientation of the tree from which the wood is taken is specified by a point which lies on the axis in argument "trunk centre" and a direction vector pointing along the axis of the tree in argument "trunk direction".
Default:(1.0, 0.0, 0.0)
Hint: [ -1, 1 ], [ -1, 1 ], [ -1, 1 ]
"wood colour" Description: The colour of the wood between the rings (normally lighter coloured wood representing spring growth in the tree).
Default:(0.67, 0.44, 0.28)
Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ]
"ring colour" Description: The colour of the (normally darker) rings in the wood.
Default:(0.62, 0.37, 0.24)
Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ]
"ring width" Description: The width of the rings relative to the tree's trunk. 0.0 means no ring at all, 1.0 means that all the trunk area is covered by the ring colour.
Default:0.4
Hint:[ 0.1, 0.6 ]
"ring fuzz in" Description: Specifies the sharpness of the edges of the inside of the rings (the value actually represents the fraction of the ring width over which the interpolation from one colour to the other is done). The default value was chosen to represent common growing cycles in temperate climates (a reasonably quick start of new growth in the spring followed by a slower decline in growth during the late summer).
Default:0.3
Hint:[ 0.1, 1 ]
"ring fuzz out" Description: Specifies the sharpness of the edges of the outside of the rings (the value actually represents the fraction of the ring width over which the interpolation from one colour to the other is done). The default value was chosen to represent common growing cycles in temperate climates (a reasonably quick start of new growth in the spring followed by a slower decline in growth during the late summer).
Default:0.3
Hint:[ 0.1, 1 ]
"gnarl" Description: Allows random perturbation of the regular rings inside the trunk. This allows localised `knot' patterns to form, for example. The higher value of the parameter the more `gnarled' the rings pattern becomes.
Default:0.07
Hint:[ 0, 2 ]
"grain" Description: Determines the intensity of the random grain effect. 0.0 means no grain at all, with higher values making the grains more distinct and visible (values in the order of 0.5, 1.0 or 2.0 create reasonable effects).
Default:0.4
Hint:[ 0, 2 ]
"ring fuzz grain" Description: The amplitude of the high-frequency perturbations of the ring edges.
Default:0.1
Hint:[ 0, 0.5 ]
"grain colour" Description: The colour of the random flecks or grains in the wood pattern.
Default:(0.10, 0.06, 0.03)
Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ]
"grain scale" Description: Determines the size of the grain in relation to ring size (both the random grain flecks and the ring fuzz grain). Values between 0.1 and 2.0 are resonable---1.0 means that the grain size is comparable to the distance between two adjacent rings.
Default:0.05
Hint:[ 0.1, 2 ]

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