Shader: "wrapped paint splat"

"wrapped paint splat"
ClassColour
Synopsis Paint splat effect shader that emulates paint dots on a plastic surface. This shader works well when used to build up layers using the "layered" shader.
Arguments

"scale" Type: LtFloat
Default:0.02
Range:[ 1e-006, inf ]
Hint:[ 0.01, 1000 ]
"density" Type: LtFloat
Default:0.2
Range:[ 0, 1 ]
Hint:-
"size variance" Type: LtFloat
Default:0.1
Range:[ 0, 1 ]
Hint:-
"colour 1" Type: LtColour
Default:(1.0, 1.0, 1.0)
Range: [ 0, inf ], [ 0, inf ], [ 0, inf ]
Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ]
"colour 2" Type: LtColour
Default:(1.0, 1.0, 1.0)
Range: [ 0, inf ], [ 0, inf ], [ 0, inf ]
Hint: [ 0, 1 ], [ 0, 1 ], [ 0, 1 ]
"shape detail" Type: LtFloat
Default:1.0
Range:[ 0, 10 ]
Hint:[ 0, 1 ]
Locationlishpro
Description This shader emulates paint dots on a surface. The density of dots on the surface is controlled by "density". Variance of their size can be changed by "size variance" parameter. Value of 0.0 means all dots will have equal size. Value of 1.0 shows biggest random differences in their sizes.

Each dot has a plain colour chosen randomly by linear interpolation of "colour 1" and "colour 2".

Default value of "shape detail" equal 0 means that all splats are circular. Increasing value of this parameter makes them more irregular by applying noise to their edges.

Overall scale of the image is controller by parameter "scale".

This shader doesn't change the input colour Ci of areas not covered by paint splats and is therefore well suited to be used with "layered" colour shader. Few paint splat shaders can be stacked to produce more complex patterns. If used on its own, areas not covered by paint splats are filled by default, black colour. Note, that positions of centres of splats change randomly as shader parameters change. This way many layers of paint splats won't cover each other when used with "layered".

Example 

/*
 * Set up "layered" shader using "wrapped paint splat".
 */


LtData   data;
LtShader layered,    /* layered */
         background, /* plain */
         layer1,     /* wrapped paint splat */
         layer2,     /* wrapped paint splat */


layered = LiShaderCreate( LI_SHADER_CLASS_COLOUR, "layered" );


background = LiShaderCreate( LI_SHADER_CLASS_COLOUR, "plain" );


layer1 = LiShaderCreate( LI_SHADER_CLASS_COLOUR, "wrapped paint splat" );
layer2 = LiShaderCreate( LI_SHADER_CLASS_COLOUR, "wrapped paint splat" );


/* Set child shaders of layered shader */


LiDataSetShader( &data, background );
LiShaderSetArg( layered, "base colour", &data );


LiDataSetShader( &data, layer1 );
LiShaderSetArg( layered, "layer 1", &data );


LiDataSetShader( &data, layer2 );
LiShaderSetArg( layered, "layer 2", &data );


/* Set parameters of paint splat shaders */


LiDataSetFloat( &data, 0.01 );
LiShaderSetArg( layer1, &data );


LiDataSetFloat( &data, 0.65 );
LiShaderSetArg( layer2, &data );

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