Ghost Vibration

This shader introduces a “ghost” effect that superimposes a semi-transparent, vibrating version of the current screen texture over itself. The intensity of the ghost effect can be finely tuned with a range from 0.0 to 1.0. Additionally, it incorporates a vibration mechanism that causes the ghost image to oscillate around its position, creating an eerie, dynamic presence. The vibration’s speed, frequency, and amplitude are adjustable.

The easiest way to use it is to put it into a ColorRect node as shader material within a CanvasLayer. 

Shader code

shader_type canvas_item;
uniform float ghost : hint_range(0.0, 1.0) = 0.0;
uniform sampler2D SCREEN_TEXTURE: hint_screen_texture,filter_linear_mipmap_anisotropic;



uniform float speed : hint_range(0.0, 20.0) = 0.0;
uniform float giggle : hint_range(0.0, 200.0) = 0.0;
uniform float amplitude : hint_range(0.0, 1.0) = 0.0;


void fragment()
{
    vec4 baseTexture = texture(SCREEN_TEXTURE, UV);
    COLOR.r = baseTexture.r;
    COLOR.g = baseTexture.g;
    COLOR.b = baseTexture.b;

    // Centre pour l'effet de fantôme
    vec2 center = vec2(0.5, 0.5);
    vec2 offset = (UV - center) * ghost; // Ajuste le décalage en fonction de 'ghost'
    vec2 ghostUV = center + offset; // Calcule les nouvelles coordonnées UV pour l'effet de fantôme

    // Ajout de l'effet de vibration sur l'effet de fantôme
    vec2 distortion = vec2(ghostUV.x + cos(TIME * speed + (ghostUV.y * giggle)) * amplitude, ghostUV.y);

    // Appliquer l'effet "fantôme" avec les coordonnées UV distordues (vibrantes)
    COLOR += texture(SCREEN_TEXTURE, distortion) * ghost;
}

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