• Hey there,

    I just finished messing around with getting some glsl chromakey / green-screen shader code I found at shadertoy.com working in Izzy and thought I might share it here.

    You can copy and paste the code below into a new GLSL actor. You can also use this user actor:Chromakey++.iua3

    // this was converted into izziease from a bit of code "Created by jackdavenport in 2015-05-30" 
    // it may be found here https://www.shadertoy.com/view...

    // ISADORA_FLOAT_PARAM(thresh, thsh, 0.0, 1.0, 1.0, "Threshold amount.");

    uniform float thresh;

    // ISADORA_FLOAT_PARAM(padd, padd, 0.0, 1.0, 1.0, "Padding amount.");

    uniform float padd;

    // ISADORA_FLOAT_PARAM(red_color, red, 0.0, 1.0, 1.0, "Amount of red to key out.");
    // ISADORA_FLOAT_PARAM(green_color, gren, 0.0, 1.0, 1.0, "Amount of green to key out.");
    // ISADORA_FLOAT_PARAM(blue_color, blue, 0.0, 1.0, 1.0, "Amount of blue to key out.");

    uniform float red_color;
    uniform float green_color;
    uniform float blue_color;

    void mainImage ( out vec4 fragColor, in vec2 fragCoord )
    vec2 uv = fragCoord.xy / iResolution.xy;
        vec4 greenScreen = vec4(red_color, green_color, blue_color, 1.0);
        vec4 color = texture(iChannel0, uv);
        vec3 diff = color.xyz - greenScreen.xyz;
        float fac = smoothstep(thresh-padd,thresh+padd, dot(diff,diff));
        color = mix(color, texture(iChannel1, uv), 1.-fac);
    fragColor = color;

  • Tech Staff


    It'd be great if you could add this to the TroikaTronix Add-Ons page, as it's the ideal place to archive useful tools for the community.

    Best wishes,


  • @woland

    I would love to do that, was not sure if it is up to snuff I suppose and so shied away from that - but will do.