Question

为什么在Openg gles 2.0中存在阶梯式而非逐渐的漫反射光照？

 String fragmentShaderCode =

        "precision highp float;" +

                "uniform vec4 u_color;" +
                "varying vec3 v_pos;" +
                "varying vec3 v_normal;" +

                "void main() {" +
                "vec3 u_camera=vec3(0.0,0.0,0.0);"+
                "vec3 u_lightPosition=vec3(0.0,0.0,0.0);"+
                "vec3 n_normal=normalize(v_normal);"+
                "vec3 lightvector = normalize(u_lightPosition - v_pos);"+


                "float ambient=0.1;"+
                "float k_diffuse=0.5;"+
                "float cos=(n_normal.x*lightvector.x+n_normal.y*lightvector.y+n_normal.z*lightvector.z)/(length(n_normal)*length(lightvector));"+
                "if(cos<0.0)cos=0.0;"+
                "float an=acos(cos)*(180.0/3.14);"+
                "float diffuse =k_diffuse* (1.0-an/90.0);"+

enter image description here ＆＃34; gl_FragColor = u_color *（漫反射+环境）;＆＃34; +

                "}";

我做了三角形，以便形成具有法线的平面（0.0,0.0,1.0）。问题是光逻辑通常是正确的，但具有陡峭的视觉效果。所以这是我的三角形： static float triangleCoords [] = { //按逆时针顺序： 5.0f，5.0f，0.0f，// top -5.0f，5.0f，0.0f， -5.0f，-5.0f，0.0f，

        5.0f,  5.0f, 0.0f,
        -5.0f,  -5.0f, 0.0f,
        5.0f,  -5.0f, 0.0f,
       // bottom right
};
static float norms[] = {
        // in counterclockwise order:
        0.0f,  0.0f, 1.0f,   // top
        0.0f,  0.0f, 1.0f,
        0.0f,  0.0f, 1.0f,

        0.0f,  0.0f, 1.0f,  // top
        0.0f,  0.0f, 1.0f,
        0.0f,  0.0f, 1.0f
};

这是我的顶点着色器：`private final String vertexShaderCode =

        "uniform mat4 prMat;" +
                "uniform mat4 camMat;" +

                "attribute vec3 a_pos;" +
                "varying vec3 v_pos;" +
                "attribute vec3 a_normal;" +
                "varying vec3 v_normal;" +



                "void main() {" +
                "vec4 ver=camMat*vec4(a_pos,1.0);"+

                "v_pos=ver.xyz;"+
                "vec4 v_n=vec4(a_normal,1.0);"+
                "v_normal=normalize(v_n.xyz);"+
                "  gl_Position = prMat*camMat*vec4(a_pos,1.0);" +
                "}";`

来自渲染的一些代码： Matrix.translateM（camMat，0,0.0f，0.0F，-7.0f）; mTriangle.draw（mProjectionMatrix，camMat，0）;`

enter code here

Open GLES 2.0 android中的漫反射光模型

0 个答案: