private void btnTest_Click(object sender, EventArgs e)
{
//观察点位置
Point3D eye = new Point3D(0, 0, 0);
//用于做显示的bmp---
Bitmap bmp = new Bitmap(200, 100);
world = new World();
Random r = new Random();
//小球
Sphere sphere = new Sphere(new Point3D(0, 0, -1), 0.5);//球体位置
sphere.GloMaterial = new Lambert(new SColor(0.8, 0.3, 0.3));
world.AddGeoObj(sphere);
//小球
Sphere sphere2 = new Sphere(new Point3D(1, 0, -1), 0.5);//球体位置
sphere2.GloMaterial = new Metal(new SColor(0.8, 0.6, 0.2), 0.5);
world.AddGeoObj(sphere2);
//小球
Sphere sphere3 = new Sphere(new Point3D(-1, 0, -1), 0.5);//球体位置
sphere3.GloMaterial = new Dielectrics(1.5);
//sphere3.GloMaterial = new Metal(new SColor(0.8, 0.8, 0.8),0.5);
world.AddGeoObj(sphere3);
//底部大球
Sphere sphere4 = new Sphere(new Point3D(0, -100.5, -1), 100);//球体位置
sphere4.GloMaterial = new Lambert(new SColor(0.8, 0.8, 0.0));
world.AddGeoObj(sphere4);
double step = 0.02;
//采样点数量
int sp = 100;
Point3D p;
Vector3D dir;
for (int i = 0; i < 200; i++)
{
for (int j = 0; j < 100; j++)
{
//颜色
SColor clr = new SColor(0, 0, 0);
//随机采样
for (int s = 0; s < sp; s++)
{
//成像平面上的每个点的位置
p = new Point3D(-2 + step * (i + random()),
1 - step * (j + random()),
-1);
//起始光线的方向
dir = p - eye;
dir.Normalize();
Ray primaryRay = new Ray(eye, dir);
int depth = 0;
//渲染。。。
clr += Render(primaryRay, depth);
}
//
clr *= 1.0 / sp;
clr = new SColor(Math.Sqrt(clr.R),
Math.Sqrt(clr.G),
Math.Sqrt(clr.B));
//渲染到bmp
bmp.SetPixel(i, j, clr.GetRGB255Color());
}
}
picRt.BackgroundImage = bmp;
}
public void Render()
{
//观察点
Point3D eye = new Point3D(0, 0, 4);
World world = new World();
world.Bulid();
//环境光
SColor Ia = new SColor(1, 1, 1);
Light light = new Light();
light.Lightcolor = new SColor(1, 1, 1); //光源亮度
light.Position = new Point3D(3, 2, 2); //光源
int hRes = 800;
int vRes = 400;
double hOffset = 4.0 / hRes;
double vOffset = 2.0 / vRes;
Bitmap bmp = new Bitmap(hRes, vRes);
for (int i = 0; i < hRes; i++)
{
for (int j = 0; j < vRes; j++)
{
//成像平面上的每个点
Point3D p = new Point3D(-2 + i * hOffset, 1 - j * vOffset, 2);
Vector3D dir = p - eye;
Ray primaryRay = new Ray(eye, dir);
ShadeRec sr;//击中点的记录
//求最近的交点信息
sr = world.HitAll(primaryRay);
if (sr != null)
{
//交点到光源
Vector3D rayLight = light.Position - sr.Hitpoint;
rayLight.Normalize();
Ray shadowRay = new Ray(sr.Hitpoint, rayLight);
if (!world.ShadowHitAll(shadowRay))
{
//bool isHit = sphere.Hit(primaryRay,sr);
Vector3D L = light.Position - sr.Hitpoint;//入射光
L.Normalize();
//计算R：反射单位矢量
Vector3D R = 2.0 * (sr.Normal * L) * sr.Normal - L;
R.Normalize();
Vector3D V = eye - sr.Hitpoint;
V.Normalize();
double LN = L * sr.Normal;
double VR = V * R;
if (LN <= 0)
{
LN = 0;
}
if (VR <= 0)
{
VR = 0;
}
//环境光+Lambert漫反射+Phong镜面反射
//SColor Idiffuse = Ia * ka + Id * Kd * LN;
//SColor Idiffuse = sphere.Mat.Matcolor * ka + Id * sphere.Mat.Kd * LN + Id * sphere.Mat.Ks * Math.Pow(VR, sphere.Mat.Ns);
SColor Idiffuse = Ia * sr.HitObjMat.Ka + light.Lightcolor * sr.HitObjMat.Kd * LN + light.Lightcolor * sr.HitObjMat.Ks * Math.Pow(VR, sr.HitObjMat.Ns);
SColor color = Idiffuse * sr.HitObjMat.Matcolor;
//bmp.SetPixel(i, j, Idiffuse.GetRGB255Color());
double theta = Math.PI * trackBar1.Value / 180.0;
double x = sr.Hitpoint.X * Math.Cos(theta) + sr.Hitpoint.Z * Math.Sin(theta);
double z = -sr.Hitpoint.X * Math.Sin(theta) + sr.Hitpoint.Z * Math.Cos(theta);
if (sr.HitObjMat.IsTexture)
{
sr.Hitpoint.X = x;
sr.Hitpoint.Z = z;
//纹理颜色
Color textureColor = texture.getColor(sr);
//光照颜色
Color lightColor = color.GetRGB255Color();
//融合权重
double t = 0.7;
//融合
Color blendColor = Color.FromArgb(
(int)(textureColor.R * t + lightColor.R * (1 - t)),
(int)(textureColor.G * t + lightColor.G * (1 - t)),
(int)(textureColor.B * t + lightColor.B * (1 - t))
);
/*Color blendColor = Color.FromArgb(
* (int)(textureColor.R * (lightColor.R /255 ),
* (int)(textureColor.G * (lightColor.G /255 )),
* (int)(textureColor.B * (lightColor.B /255 ))
* );*/
bmp.SetPixel(i, j, blendColor);
}
else
{
bmp.SetPixel(i, j, color.GetRGB255Color());
}
}
else
{
bmp.SetPixel(i, j, Color.Black);
}
}
else
{
bmp.SetPixel(i, j, Color.FromArgb(81, 74, 88));
}
}
}
pic1.BackgroundImage = bmp;
}