public static void Test()
{
Vector3D a = new Vector3D(1, 2, 1,1);
Vector3D b = new Vector3D(5, 6, 0,1);
Vector3D c = new Vector3D(1, 2, 3, 1);
float r1 = Vector3D.Dot(a,b);
Vector3D r2 = a - b;
Vector3D r3 = Vector3D.Cross(a,b);
Console.WriteLine("a dot b:{0}", r1);
Console.WriteLine("a - b:({0},{1},{2},{3})", r2.x, r2.y, r2.z, r2.w);
Console.WriteLine("a X b:({0},{1},{2},{3})", r3.x, r3.y, r3.z, r3.w);
//
Matrix4x4 mat1 = new Matrix4x4(1,2,3,4,
1,2,3,4,
1,2,3,4,
0,0,0,1);
Matrix4x4 mat2 = new Matrix4x4(1, 2, 3, 4,
1, 2, 3, 4,
1, 2, 3, 4,
1, 2, 3, 4);
Matrix4x4 mat3 = new Matrix4x4();
mat3.Identity();
Matrix4x4 mat4 = new Matrix4x4(1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
1, 2, 3, 1);
Matrix4x4 mat5 = new Matrix4x4(1, 2, 3, 4,
4, 3, 2, 1,
0, -1, 2, 0,
1, 6, 4, -2);
Console.WriteLine("mat5 Determinate:" + mat5.Determinate());
Console.WriteLine("mat5 GetAdjoint:");
showMat(mat5.GetAdjoint());
Console.WriteLine("mat5 Inverse:" );
showMat(mat5.Inverse());
Console.WriteLine("mat5 * mat5 Inverse:");
showMat(mat5 * mat5.Inverse());
Console.WriteLine("mat2 Transpose:");
showMat(mat2.Transpose());
Matrix4x4 matr1 = mat1 * mat3;
Console.WriteLine("mat1 * mat3:");
showMat(matr1);
Matrix4x4 matr2 = mat1 * mat2;
Console.WriteLine("mat1 * mat2:");
showMat(matr2);
Vector3D r4 = a * mat1;
Console.WriteLine("a * mat1:({0},{1},{2},{3})", r4.x, r4.y, r4.z, r4.w);
Vector3D r5 = a * mat4;
Console.WriteLine("a * mat4:({0},{1},{2},{3})", r5.x, r5.y, r5.z, r5.w);
}
/// <summary>
/// 实现了“基础光照模型”，在世界空间进行顶点光照处理
/// </summary>
/// <param name="v"></param>
private void Lighting(Matrix4x4 m, Vector3D worldEyePositon ,ref Vertex v)
{
Vector3D worldPoint = v.point * m;//世界空间顶点位置
Vector3D normal = v.normal * m.Inverse().Transpose();//模型空间法线乘以世界矩阵的逆转置得到世界空间法线
normal = normal.Normalize();
SoftRenderer.RenderData.Color emissiveColor = _mesh.material.emissive;//自发光
SoftRenderer.RenderData.Color ambientColor = _ambientColor * _mesh.material.ka;//环境光
Vector3D inLightDir = (_light.worldPosition - worldPoint).Normalize();
float diffuse = Vector3D.Dot(normal, inLightDir);
if(diffuse < 0)
{
diffuse = 0;
}
SoftRenderer.RenderData.Color diffuseColor = _mesh.material.diffuse * diffuse * _light.lightColor;//漫反射
//
Vector3D inViewDir = (worldEyePositon - worldPoint).Normalize();
Vector3D h = (inViewDir + inLightDir).Normalize();
float specular = 0;
if(diffuse != 0)
{//防止出现光源在物体背面产生高光的情况
specular = (float)System.Math.Pow(MathUntil.Range(Vector3D.Dot(h, normal), 0, 1), _mesh.material.shininess);
}
SoftRenderer.RenderData.Color specularColor = _mesh.material.specular * specular * _light.lightColor;//镜面高光
//
v.lightingColor = emissiveColor + ambientColor + diffuseColor + specularColor;
}