散弹视觉冲击 shader

最新推荐文章于 2023-12-06 22:56:31 发布

lynon

最新推荐文章于 2023-12-06 22:56:31 发布

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本文提供了一个使用 GLSL (图形库着色语言标准) 编写的实时渲染示例代码，该示例展示了如何通过旋转、随机数生成及三角函数等操作实现动态流星轨迹效果。

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转载自： http://glslsandbox.com/e#44947.0

#ifdef GL_ES
precision highp float;
#endif

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;

#define PI 3.14159265359
//#define time

float random(float n) {
return fract(abs(sin(n * 55.753) * 367.34));
}

mat2 rotate2d(float angle){
return mat2(cos(angle), -sin(angle), sin(angle), cos(angle));
}

void main( void ) {
vec2 uv = (gl_FragCoord.xy * 2.0 - resolution.xy) / resolution.x;

uv *= rotate2d(time * 0.2); //time * 0.2

float direction = 1.0;
float speed = time * direction * 1.6;
float distanceFromCenter = length(uv);

float meteorAngle = atan(uv.y, uv.x) * (180.0 / PI);

float flooredAngle = floor(meteorAngle);
float randomAngle = pow(random(flooredAngle), 0.5);
float t = speed + randomAngle;

float lightsCountOffset = 0.4;
float adist = randomAngle / distanceFromCenter * lightsCountOffset;
float dist = t + adist;
float meteorDirection = (direction < 0.0) ? -1.0 : 0.0;
dist = abs(fract(dist) + meteorDirection);

float lightLength = 100.0;
float meteor = (5.0 / dist) * cos(sin(speed)) / lightLength;
meteor *= distanceFromCenter * 2.0;

vec3 color = vec3(0.);
color += meteor;

gl_FragColor = vec4(color, 1.0);
}