static float calcDirectSunLight(RayCastManager rayTraceManager, Vector3 sunDir, int globalX, int globalY, int globalZ, int faceIndex)
{
//计算ao
Vector3 faceNormal = Const.getFaceNormal(faceIndex);
float faceLightFactor = Vector3.Dot(faceNormal, -sunDir);
if (faceLightFactor < 0)
{
return(0);
}
else
{
Vector3 startPos = (new Vector3(globalX, globalY, globalZ) + Vector3.one * 0.5f + faceNormal * 0.501f) * Const.BlockSize;
float rayLength = 100.0f;
//float brightness = 0.0f;
RayCastRestult rlt = rayTraceManager.rayCast(startPos, -sunDir, rayLength, RayCastBlockType.All);
if (rlt.bHit)
{
return(0);
}
else
{
return(faceLightFactor);
}
}
}
public static Vector3[] getRandomRays(int num, int faceIndex)
{
//UnityEngine.Random.seed = 12345678;
RandomPoints randomPoints = new RandomPoints();
Vector2[] angles = randomPoints.getRandomPoints(num);
Vector3[] rays = new Vector3[num];
Vector3 faceNormal = Const.getFaceNormal(faceIndex);
for (uint i = 0; i < angles.Length; i++)
{
rays[i] = RandomPoints.getNewDir(angles[i].x, angles[i].y, faceNormal);
}
return(rays);
}
static float calcAo(RayCastManager rayTraceManager, Vector3[] rays, int globalX, int globalY, int globalZ, int faceIndex)
{
//计算ao
Vector3 startPos = (new Vector3(globalX, globalY, globalZ) + Vector3.one * 0.5f + Const.getFaceNormal(faceIndex) * 0.51f) * Const.BlockSize;
float rayLength = 16;
float brightness = 0.0f;
Vector3[] startPosArray = new Vector3[rays.Length];
float[] rayLenghtArray = new float[rays.Length];
for (int i = 0; i < startPosArray.Length; i++)
{
startPosArray[i] = startPos;
rayLenghtArray[i] = rayLength;
}
RayCastRestult[] rlts = rayTraceManager.batchRayCast(startPosArray, rays, rayLenghtArray, RayCastBlockType.Opacity);
for (uint i = 0; i < rays.Length; i++)
{
RayCastRestult rlt = rlts[i];//rayTraceManager.rayCast(startPos, rays[i], rayLength);
if (rlt.bHit && rlt.hitLength < rayLength)
{
float a = ((rlt.hitLength) / rayLength);
brightness += (a / rays.Length);
}
else
{
brightness += 1.0f / rays.Length;
}
}
brightness = Mathf.Clamp(brightness, 0.0f, 1.0f);
return(Mathf.Pow(brightness, 0.8f) * 0.9f + 0.1f);
}