linePatternD01

Function call: fn_linePatternD01 (uv, color1, color2, number, edgeSharpness);

Example with values: fn_linePatternD01 (uv, float3(0.1, 0.1, 0.4), float3(0.9, 0.3, 0.0), 20.0, 1000.0);
(Result see image)

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Purpose:
Creates a pattern of a selectable number of symmetrical diagonal 45° lines
of alternating color or brightness or another RGB source.
This can be a color, or a texture from a sampler.
Adjustable edge softness of the squares.
More details see the parameter descriptions.

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Required global definitions and declarations:

(add outside and above all shaders and functions):

//-----------------------------------------------------------------------------------------//
// Definitions and declarations
//-----------------------------------------------------------------------------------------//

float _OutputAspectRatio;
#define PI  3.141592654

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Code (Example as a float3 RGB function without alpha):

float3 fn_linePatternD01 (float2 uv, float3 color1, float3 color2, float number, float edgeSharpness)
{ 
   float mix = uv.x + (uv.y / _OutputAspectRatio);
   mix =  sin (mix * PI * number ) * edgeSharpness / number;
   return lerp (color1, color2, clamp( mix, -0.5, 0.5) + 0.5);
}

When making code changes, note that color1 and color2 must have the same float type.

Code description at the bottom of this page.

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Parameter Description

1. uv:
   Enter the name of the used texture coordinate variable.
   Type: float2

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1. color1:
   Color of the first square at the top left.
   Type: float3 (RGB)
   • This can be a color, or a texture from a sampler.

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1. color2:
   Color of the squares next to color1 squares.
   Type: float3 (RGB)
   • This can be a color, or a texture from a sampler.

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1. number:
   The number of lines of both colors, counted only at the top or bottom edge of the frame.
   Type: float
   Value range: > +1 or < -1
   Illegal value is 0 (leads to division by 0)

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1. edgeSharpness:
   Edge sharpness of the squares
   Type: float
   Value range: > +1 or < -1
   Values around 1000 and above result in relatively sharp edges for HD formats.
   At 200 and below, the edge smoothness is clearly visible.

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Return value:

• The value of the parameter color1 or color2 (in the change of squares)
• Type: float3 (same type as color1 and color2)
• Value range: 0.0 to 1.0

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Code description

The code at the top of this page is compressed.
For a better understanding, the uncompressed code is described here:

float3 fn_linePatternD01 (float2 uv, float3 color1, float3 color2, float number, float edgeSharpness)
{ 
   float mix = uv.x + (uv.y / _OutputAspectRatio);
   mix =  sin (mix * PI * number );
   mix *=  edgeSharpness / number;
   mix =  clamp( mix, -0.5, 0.5);      // range -0.5 +0.5
   mix += 0.5 ;                        // range 0 to 1
   return lerp (color1, color2, mix);
}

Code description:

float mix = uv.x + (uv.y / _OutputAspectRatio); This produces a value that is constant in the diagonal direction, from bottom left to top right, at a 45 ° angle. This makes the lines created in the following lines of code diagonal.

mix = sin (mix * PI * number ); Creates a diagonal wave pattern ( value range from -1 to +1).

The following two lines of code increase the sharpness:

mix *=  edgeSharpness / number;
mix =  clamp( x, -0.5, 0.5);   // range -0.5 +0.5`

` mix += 0.5 ; ` Move to the normal range from 0 to 1

return lerp (color1, color2, mix); Assignment to the set colors.
If you only need black and white lines then you can simplify the code by returning the mix variable.

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Screenshot