Question

我创建法线的AGAL代码是：

    "nrm ft1.xyz, v1.xyz\n" + // renormalize normal
    "dp3 ft1, fc2.xyz, ft1.xyz \n" + // directional light contribution

但是我得到一个非常圆的物体，是否有一种方法可以生成法线，使其在边缘处更加清晰。

由于

Answer 1

找到解决方案：我使用我的脚本（从http://not-so-stupid.com/导出脚本）从3DMax导出模型，但是选择Sandy 3.0格式，这使得“导出顶点法线”有效，然后我从脚本创建的as文件中复制信息。我将法线放在一个新的顶点缓冲区中并上传它们：

context.setVertexBufferAt( 2, normalBuffer, 0, Context3DVertexBufferFormat.FLOAT_3);

然后在着色器代码中使用它们：

        private const VERTEX_SHADER_LIGHT:String = "" +
        "m44 op, va0, vc0\n" + // pos to clipspace
        "mov v0, va1 \n" +  // copy uv
        "mov vt1.xyz, va2.xyz\n"+
        "mov vt1.w, va2.w\n"+   
        "mov v1, vt1\n"; 

    private const FRAGMENT_SHADER_LIGHT:String = "" +
    "tex ft0, v0, fs0 <2d,linear,nomip>\n" + // read from texture
    "nrm ft1.xyz, v1.xyz\n" + // renormalize normal v1 contains the normals created in the vertex code
    "dp3 ft1, fc2.xyz, ft1.xyz \n" + // directional light contribution
    "neg ft1, ft1 \n" + // negation because we have a vector "from" light 
    "max ft1, ft1, fc0 \n"+ // clamp to [0, dot]

    "mul ft1, ft1, fc3 \n"+ // contribution from light
    "mul ft1, ft1, ft0 \n"+ // contribution from light + texture


    "add oc, ft1, fc1"; // final color as surface + ambient

如何更改模型的法线，使其看起来不那么圆润

1 个答案: