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{
"QEN": {
"description": "Generates snowing effect.",
"fragmentCode": [
"@main",
"{",
" float snowing = 0.0;",
" float time = iTime * 0.8;",
" for (int i = 1; i < (1 + snowingLayers); i++) {",
" // Divide layer into cells",
" float cellAmount = 2.0 + (float(i) * 3.0);",
" vec2 uv = vec2(texCoord.x, texCoord.y - time * snowingGravity * (1.0 / float(i)));",
" vec2 uvStep = (ceil(uv * cellAmount - vec2(0.5, 0.5)) / cellAmount);",
" float discardFlake = fract(sin(dot(uvStep.xy, vec2(32.4691, 94.615))) * 31572.1684);",
" if (discardFlake < 0.3) {",
" // Random positions inside the cell",
" float x = fract(sin(dot(uvStep, vec2(12.9898, 78.233))) * 43758.5453) - 0.5;",
" float y = fract(sin(dot(uvStep, vec2(62.2364, 94.674))) * 62159.8432) - 0.5;",
" float maxMag = snowingVariation / (1.0 + snowingFlakeSize);",
" float mag1 = maxMag / cellAmount * cos(time * 3.0);",
" float mag2 = maxMag / cellAmount * sin(time * 3.0);",
" float d = (2.0 / snowingFlakeSize) * distance((uvStep.xy + vec2(x , sin(y)) * mag1 + vec2(y, x) * mag2), uv);",
" float snowd = (x + 1.0) * 0.5 * clamp((1.5 - d * (10.0 + (x * 5.0)) * cellAmount), 0.0, 1.0);",
" snowing +=snowd;",
" }",
" }",
" vec4 snowingColor = vec4(1.0, 1.0, 1.0, snowing);",
" fragColor = mix(fragColor, snowingColor * fragColor.a, snowing);",
"}"
],
"name": "Snowing",
"properties": [
{
"defaultValue": "4",
"description": "The amount of snow layers. Increasing the layers adds variation to the snowing effect, but also requires more processing power. The default value is 4 and practical range is between 1 and 10.",
"maxValue": "10",
"minValue": "1",
"name": "snowingLayers",
"type": "int"
},
{
"defaultValue": "1",
"description": "Size of a single snowflake. The default value is 1.0 and practical range is between 0.2 and 2.0.",
"maxValue": "2",
"minValue": "0.2",
"name": "snowingFlakeSize",
"type": "float"
},
{
"defaultValue": "1",
"description": "Defines gravity of the snowing effect so how fast the snowflakes fall down. The default value is 1.0 and practical range is between 0.2 and 2.0.",
"maxValue": "2",
"minValue": "0.2",
"name": "snowingGravity",
"type": "float"
},
{
"defaultValue": "0.5",
"description": "Defines how much snowflakes positions vary while they are coming down. The default value is 0.5 and the range is between 0.0 and 1.0.",
"maxValue": "1",
"minValue": "0",
"name": "snowingVariation",
"type": "float"
}
],
"version": 1
}
}