protected virtual void Start()
{
ppmTexture.Init(200, 100);
RTRay ray = new RTRay();
Vector3 origin = Vector3.zero;
Vector3 leftBottomCorner = new Vector3(-2, -1, -1);
Vector3 horizontal = new Vector3(4, 0, 0);
Vector3 vertical = new Vector3(0, 2, 0);
for (int j = 0; j < ppmTexture.Height; ++j)
{
for (int i = 0; i < ppmTexture.Width; ++i)
{
float u = (float)i / ppmTexture.Width;
float v = (float)j / ppmTexture.Height;
ray.Set(origin, leftBottomCorner + horizontal * u + vertical * v);
Color color = GetColor(ray, 0);
ppmTexture.WriteAPixel(color);
}
}
ppmTexture.Complete();
RenderingComplete();
}
public RTRay GetRay(float u, float v)
{
RTRay ray = new RTRay();
ray.Set(origin, leftBottomCorner + horizontal * u + vertical * v - origin);
return(ray);
}
public RTRay GetRay(float s, float t)
{
Vector3 rd = RTMath.RndInUnitSphere() * len_radius;
Vector3 offset = u * rd.x + v * rd.y;
RTRay ray = new RTRay();
ray.Set(origin + offset, leftBottomCorner + horizontal * s + vertical * t - origin - offset);
return(ray);
}