//第一个 着色模式 第二三个 线框模式
private void DrawPrimitive(Vertex v1, Vertex v2, Vertex v3)
{
Vector v4 = v1.point * View;
Vector v5 = v2.point * View;
Vector v6 = v3.point * View;
Vector v7 = v4 * Projection;
Vector v8 = v5 * Projection;
Vector v9 = v6 * Projection;
Vector p1 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v7);
Vector p2 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v8);
Vector p3 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v9);
//纹理渲染模式 IsShaded true
Vertex v11 = new Vertex(v1);
v11.point = new Vector(p1);
v11.point.t = v7.t;
Vertex v22 = new Vertex(v2);
v22.point = new Vector(p2);
v22.point.t = v8.t;
Vertex v33 = new Vertex(v3);
v33.point = new Vector(p3);
v33.point.t = v9.t;
DrawTriangle_Shaded(v11, v22, v33);
}
public MyColor ReadTexture(double u, double v)
{
u = u * (TextureWidth - 1);
v = v * (TextureHeight - 1);
int x = (int)(u + 0.5);
int y = (int)(v + 0.5);
x = MyStaticMethod.CMID(x, 0, TextureWidth - 1);
y = MyStaticMethod.CMID(y, 0, TextureHeight - 1);
return(TextureImage[TextureHeight - 1 - y, x]);
}
public void LoadObj(bool IsTest)
{
//加载Obj模型 还在改善
if (IsTest)
{
this.mesh = new Mesh(IsTest);
}
//加载测试用例cube模型
else
{
OBJReader o = new OBJReader(this.ObjPath);
this.mesh = o.mesh;
MyStaticMethod.RotateYAroundPoint(this.mesh, new Vector(0, 0, 0, 1), -1.57);
}
}
private void DrawPrimitive(Vector v1, Vector v2, Vector v3)
{
Vector v5 = v1 * View;
Vector v6 = v2 * View;
Vector v7 = v3 * View;
Vector v9 = v5 * Projection;
Vector v10 = v6 * Projection;
Vector v11 = v7 * Projection;
Vector p1 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v9);
Vector p2 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v10);
Vector p3 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v11);
//三角形的线框模式
DrawTriangle_WireFrame(p1, p2, p3);
}
public Color ConvertToColor()
{
/*
* int r = (int)(this.r * 255);
* int g = (int)(this.g * 255);
* int b = (int)(this.b * 255);
*/
int r = (int)(this.r);
int g = (int)(this.g);
int b = (int)(this.b);
r = MyStaticMethod.CMID(r, 0, 255);
g = MyStaticMethod.CMID(g, 0, 255);
b = MyStaticMethod.CMID(b, 0, 255);
return(Color.FromArgb(r, g, b));
}
//------顶点部分---------
private void UpdateMatrix()
{
Vector up = new Vector(0, 1, 0, 1); //垂直向上的法向量
this.View = MyStaticMethod.GetViewMatrix(this.MyCamera.eye, this.MyCamera.lookat, up);
this.Projection = MyStaticMethod.GetPerspectiveMatrix(this.MyCamera.Fovy, this.MyCamera.Aspect, 1, 100);
//this.Transform = View * Projection;
//顺序不能乱 如果先去除隐藏面，然后根据显示的面来计算顶点法向量，这样有一些点的法向量会缺失，一些点法向量不完整
//比如0点 因为隐藏面全消除的关系，法向量为0，而1点的法向量，也因为只添加上1357面的法向量的缘故，法向量为1 0 0 应该是0.33 -0.33 -0.33
//所以必须先正确计算出顶点的法向量 再消除隐藏面
MyStaticMethod.GetNormalFromFaces(mesh); //获得每一个面的法向量
//MyStaticMethod.HidenFacesDemolish(mesh, at - eye); 移动至最后一行
MyStaticMethod.GetVerticesNormal(mesh); //每一个面法向量添加到相应的顶点 并归一化
MyStaticMethod.HidenFacesDemolish(mesh, this.MyCamera.lookat - this.MyCamera.eye);
MyStaticMethod.PolygonToTriangle(mesh); //把面分割成两个三角形并且赋值相应的法向量
}
private void DrawPrimitive(Vector v1, Vector v2, Vector v3, Vector v4)
{
Vector v5 = v1 * View;
Vector v6 = v2 * View;
Vector v7 = v3 * View;
Vector v8 = v4 * View;
Vector v9 = v5 * Projection;
Vector v10 = v6 * Projection;
Vector v11 = v7 * Projection;
Vector v12 = v8 * Projection;
Vector p1 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v9);
Vector p2 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v10);
Vector p3 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v11);
Vector p4 = MyStaticMethod.TransformHomogenize(this.BitMapWidth, this.BitMapHeight, v12);
//四边形的线框模式
DrawRect_WireFrame(p1, p2, p3, p4);
}
/*
* private void Button_ReadObj_Click(object sender, EventArgs e)
* {
* OpenFileDialog o = new OpenFileDialog();
* o.ShowDialog();
* if (o.FileName != null)
* {
* this.MyDevice.ObjPath = o.FileName;
* this.MyDevice.LoadObj();
* this.pictureBox1.Image = this.MyDevice.GetBigMap_UpdateMatNBitmap();
* }
* }
*/
private void Button_CameraMove_Click(object sender, EventArgs e)
{
MyStaticMethod.RotateYAroundPoint(this.MyDevice.mesh, new Vector(0, 0, 0, 1), 0.1);
this.pictureBox1.Image = this.MyDevice.GetBigMap_UpdateMatNBitmap();
}
public static void InitializedRenderTriangle(Vertex v1, Vertex v2, Vertex v3, out List <RenderTriangle> list)
{
//Y轴，v3 v2 v1，所以当v1=v2的时候，只有一个三角形，底边在下方。v2=v3时，底边在上.
list = new List <RenderTriangle>(2);
if (v1.point.y > v2.point.y)
{
MyStaticMethod.SwapVertex(ref v1, ref v2);
}
if (v1.point.y > v3.point.y)
{
MyStaticMethod.SwapVertex(ref v1, ref v3);
}
if (v2.point.y > v3.point.y)
{
MyStaticMethod.SwapVertex(ref v2, ref v3);
}
if (v1.point.y == v2.point.y && v1.point.y == v3.point.y)
{
return;
}
if (v1.point.x == v2.point.x && v1.point.x == v3.point.x)
{
return;
}
//三角形尖角向下
if (v1.point.y == v2.point.y)
{
if (v1.point.x > v2.point.x)
{
MyStaticMethod.SwapVertex(ref v1, ref v2);
}
RenderTriangle n1 = new RenderTriangle(v1, v3, v2, v3, v1.point.y, v3.point.y);
list.Add(n1);
return;
}
//三角形尖角向上
if (v2.point.y == v3.point.y)
{
if (v2.point.x > v3.point.x)
{
MyStaticMethod.SwapVertex(ref v2, ref v3);
}
list.Add(new RenderTriangle(v1, v2, v1, v3, v1.point.y, v2.point.y));
return;
}
//剩下的情况必定是在Y轴上 v3 > v2 > v1 注意d3d的规则，图像上面的y轴比较小,从上向下排列是v1 2 3
double k = (v3.point.y - v1.point.y) / (v2.point.y - v1.point.y);
double x = v1.point.x + (v2.point.x - v1.point.x) * k;
if (x <= v3.point.x) //计算其延长线，如果顶点v3在延长线左边，则v1 连上v3为最长边，如果在右边。。。
{
list.Add(new RenderTriangle(v1, v2, v1, v3, v1.point.y, v2.point.y));
list.Add(new RenderTriangle(v2, v3, v1, v3, v2.point.y, v3.point.y));
}
else
{
list.Add(new RenderTriangle(v1, v3, v1, v2, v1.point.y, v2.point.y));
list.Add(new RenderTriangle(v1, v3, v2, v3, v2.point.y, v3.point.y));
}
}
/// <summary>
/// FragmentShader是结构体 值类型，MyColor是类类型，引用类型
/// </summary>
/// <param name="FS"></param>
/// <param name="mycolor"></param>
/// <returns></returns>
public static MyColor LightMode_BlinnPhong(a2v FS, MyColor mycolor, bool IsTexture, bool IsPointLighting, Light PointLight)
{
//----------------------所有颜色统一在0-1内计算----------------返回mycolor时，在回到0-255
//材质 光照 暂时写在这边 完成光照模型后，写在外部
//MyColor Ambient = new MyColor(0, 0, 0); //环境光 可以不和下面两个一样
MyColor Ambient = new MyColor(0.3, 0.3, 0.3);
//MyColor Diffuse = new MyColor(0, 0, 0);
MyColor Diffuse = new MyColor(0.3, 0.3, 0.3);
//MyColor Specular = new MyColor(0, 0, 0);
MyColor Specular = new MyColor(0.8, 0.8, 0.8);
Material material = new Material(Ambient, Diffuse, Specular);
//PointLight = new Light(new Vector(5, 10, 0, 1), new MyColor(1, 1, 1));
//读取纹理的颜色 先假设为mycolor
MyColor texture = new MyColor();
if (IsTexture)
{
texture = new MyColor(mycolor).Scale(1.0 / 255);
}
else
{
texture.r = 0.5;
texture.g = 0.5;
texture.b = 0.5;
}
if (IsPointLighting)
{
Vector normal = new Vector(FS.WorldNormal);
Vector ViewDir = FS.eye - FS.WorldPos;
ViewDir.NormalizedVector();
Vector LightDir = PointLight.LightPos - FS.WorldPos;
double distance = LightDir.Length();//光源与渲染点的距离
LightDir.NormalizedVector();
//----衰减计算----
double constant = 1;
double linear = 0.0009;
double quadratic = 0.000032;
double num = constant + linear * distance + quadratic * (distance * distance);
double attenuation = 0;
if (num != 0)
{
attenuation = 1.0 / num;
}
attenuation = MyStaticMethod.MaxNumber(attenuation, 0);
MyColor LightAmbient = texture * ((PointLight.LightColor + EnvironmentLight) * material.Ambient);
//漫反射系数计算
double diff = MyStaticMethod.MaxNumber(Vector.DotMultiply(normal, LightDir), 0);
MyColor LightDiffuse = texture * (PointLight.LightColor * material.Diffuse) * diff;
//反射计算 blinn-phong
Vector H = (LightDir + ViewDir).NormalizedVector();
double shininess = 256;//镜面反射系数
double reflect = Math.Pow(MyStaticMethod.MaxNumber(Vector.DotMultiply(H, normal), 0), shininess);
MyColor LightSpecular = texture * PointLight.LightColor * material.Specular * reflect;
//MyColor ret = LightAmbient + (LightDiffuse + LightSpecular);
MyColor ret = LightAmbient + (LightDiffuse + LightSpecular) * attenuation;
ret.Scale(255.0);
return(ret);
}
else
{
MyColor ret = texture.Scale(255.0);
return(ret);
}
}