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Description

"This shader is meant to be used in `MultiMeshInstance3D`. It uses `INSTANCE_ID` to randomly pick a hue in the Hue-Saturation-Value color space.\r\n\r\n## Parameters\r\n\r\n* **saturation** : Color saturation (0 = greyscale, 1 = vivid)\r\n* **value** : Brightness (0 = dark, 1 = bright)"

Shader code

shader_type spatial;

uniform float saturation : hint_range(0., 1.) = 0.8;

uniform float value : hint_range(0., 1.) = 0.8;

float random (vec2 st) {
    return fract(sin(dot(st.xy,
                         vec2(12.9898,78.233)))*
        43758.5453123);
}

const vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);

vec3 hsv2rgb(vec3 c)
{
    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

void vertex() {
	float hue = random(vec2(float(INSTANCE_ID)));
	COLOR = vec4(hsv2rgb(vec3(hue, saturation, value)), 1.0);
}

void fragment() {
	ALBEDO = COLOR.rgb;
}

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