osg中海面海水仿真的着色器代码
时间: 2023-06-12 14:07:29 浏览: 108
osgOcean 是一个基于 OpenSceneGraph 的开源海洋渲染库,其中包含了海面仿真的着色器代码。
下面是一个简单的 osgOcean 海面着色器代码示例:
```
uniform float osgOcean_time;
uniform vec2 osgOcean_wind;
uniform float osgOcean_waveAmplitude;
uniform float osgOcean_waveFrequency;
uniform float osgOcean_waveSpeed;
uniform float osgOcean_choppyScale;
void main()
{
vec2 pos = gl_TexCoord[0].st;
vec2 windDir = normalize(osgOcean_wind);
vec2 flowDir = vec2(-windDir.y, windDir.x);
float choppyFactor = 1.0 + length(texture2D(osgOcean_choppyMap, pos * 0.01).xy) * osgOcean_choppyScale;
vec2 waveDir = normalize(windDir + texture2D(osgOcean_normalMap, pos * 0.1).xy * choppyFactor);
float waveSpeed = osgOcean_waveSpeed * length(waveDir);
float waveLength = pow(waveSpeed, 2.0) / 9.81;
float t = osgOcean_time * waveSpeed;
float waveHeight = 0.0;
for (int i = 0; i < 4; i++)
{
float freq = pow(2.0, float(i));
float amp = pow(osgOcean_waveAmplitude, float(i));
waveHeight += amp * sin(dot(pos, waveDir * freq) * osgOcean_waveFrequency + t * freq) / freq;
}
vec3 normal = vec3(-waveDir.y, waveDir.x, 0.0);
normal.z = sqrt(1.0 - dot(normal.xy, normal.xy));
gl_FragColor = vec4(waveHeight * normal, 1.0);
}
```
这个着色器代码使用了许多 uniform 变量,比如 `osgOcean_time`,`osgOcean_wind` 等等,这些变量可以在程序中动态设置,从而实现不同的海面效果。
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