private Color32 GetColor(Ray ray)
{
// Sphere
HitRecord record = new HitRecord();
RayHit hit = new RayHit();
foreach (Hittable h in m_Hittables)
{
hit = h.DoRaycast(ray, 0f, 0f, ref record);
}
if (hit.IsValid())
{
return(new Color32(
(byte)Mathf.Clamp(Mathf.Abs(hit.normal.x) * 255f, 0, 255),
(byte)Mathf.Clamp(Mathf.Abs(hit.normal.y) * 255f, 0, 255),
(byte)Mathf.Clamp(Mathf.Abs(hit.normal.z) * 255f, 0, 255),
(byte)255));
}
// Sky
float t = (ray.direction.y + (m_SceneHeight * .5f)) / m_SceneHeight;
return(Color32.Lerp(COLOR_WHITE, COLOR_SKY_BLUE, t));
}
private void DoRays()
{
Ray ray = new Ray(Vector3.zero, new Vector3(0f, 0f, m_SceneLowerLeft.z));
int index = -1;
if (m_EnableAA)
{
for (int y = 0; y < m_Height; y++)
{
for (int x = 0; x < m_Width; x++)
{
int r = 0, g = 0, b = 0;
for (int n = 0; n < m_AASamples; n++)
{
float u = (x + (float)m_RandomDouble.NextDouble()) / (float)m_Width;
float v = (y + (float)m_RandomDouble.NextDouble()) / (float)m_Height;
ray.direction.x = m_SceneLowerLeft.x + (u * m_SceneWidth);
ray.direction.y = m_SceneLowerLeft.y + (v * m_SceneHeight);
Color32 res = GetColor(ray);
r += res.r;
g += res.g;
b += res.b;
}
m_ColorBuffer[++index] = new Color32(
(byte)Mathf.Clamp(r * m_InvAASamples, 0, 255),
(byte)Mathf.Clamp(g * m_InvAASamples, 0, 255),
(byte)Mathf.Clamp(b * m_InvAASamples, 0, 255),
255);
}
}
}
else
{
for (int y = 0; y < m_Height; y++)
{
for (int x = 0; x < m_Width; x++)
{
float u = x / (float)m_Width;
float v = y / (float)m_Height;
ray.direction.x = m_SceneLowerLeft.x + (u * m_SceneWidth);
ray.direction.y = m_SceneLowerLeft.y + (v * m_SceneHeight);
m_ColorBuffer[++index] = GetColor(ray);
}
}
}
}
