WEBGL 学习日志

S 学习日志

smoothstep 发光

vec2 fixUV(in vec2 c) {
    return (2. * c - iResolution.xy) / min(iResolution.x, iResolution.y);
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    // Normalized pixel coordinates (from 0 to 1)
    vec2 uv = fixUV(fragCoord);
    vec3 col = vec3( 0.9 , 0.65 , 0.1   ) ;
    float d= length(uv);
    col = mix(col.rgb , vec3(0.  ) , smoothstep( 0.5 ,1. , d  ) );
    fragColor = vec4(col,1.0);
}