本文共 804 字，大约阅读时间需要 2 分钟。

在这篇文章基础上进行改进片段着色器代码，效果一样。

// Julia set renderer// Fragment Shader// Graham Sellers// OpenGL SuperBible#version 150precision highp float;out vec4 color;in vec2 initial_z;uniform sampler1D tex_gradient;uniform vec2 C;void main(void){    vec2 Z = initial_z;    int iterations = 0;    const float threshold_squared = 16.0;    const int max_iterations = 1000;    while (iterations < max_iterations && dot(Z, Z) < threshold_squared) {        vec2 Z_squared;        Z_squared.x = Z.x * Z.x - Z.y * Z.y;        Z_squared.y = 2.0 * Z.x * Z.y;        Z = Z_squared + C;        iterations++;    }		if (iterations == max_iterations)		discard;    //if (iterations == max_iterations)    //    color = vec4(0.0, 0.0, 0.0, 1.0);    //else        color = texture(tex_gradient, float(iterations) / float(max_iterations));}

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