public static RayCastResult rayCast(Vector3 startPos, Vector3 dir, RayCastManager rtm, float length, RayCastBlockType mask)
{
DirInfo dirInfo = new DirInfo(dir);
Vector3 startPosInner = startPos;
float hitTime = 0;
float startOffset = 0;
bool bHitBounds = true;//能击中总区域，或者在内部
if (startPos.x >= 0 && startPos.x < rtm.getSizeX() && startPos.y >= 0 && startPos.y < rtm.getSizeY() && startPos.z >= 0 && startPos.z < rtm.getSizeZ())
{
bHitBounds = true;
}
else
{
bHitBounds = Misc.rayHitAABB(startPos, dir, new Vector3(0, 0, 0), rtm.getSize(), ref hitTime);
if (hitTime > 0)
{
startOffset = hitTime;
}
startPosInner = startPos + dir * startOffset - dir * 0.01f;
}
if (bHitBounds)
{
RayCastResult rlt = rayTraceSmall(startPosInner, dirInfo, rtm, Face.FNI_Unknown, length - startOffset, mask);
rlt.hitLength += startOffset;
return(rlt);
}
else
{
return(new RayCastResult(false, 0, 0, 0, Face.FNI_Unknown, 0));
}
}
private static Texture3D Create3DTexture(RayCastManager rtc)
{
Texture3D voxelTexture = new Texture3D(rtc.getSizeX(), rtc.getSizeY() / 8, rtc.getSizeZ(), TextureFormat.Alpha8, false);
voxelTexture.filterMode = FilterMode.Point;
voxelTexture.wrapMode = TextureWrapMode.Clamp;
voxelTexture.SetPixels(ToColorsA(rtc, 8));
voxelTexture.Apply();
return(voxelTexture);
}
public static Color[] ToColorsA(RayCastManager rtc, int bits)
{
int dgx = rtc.getSizeX();
int dgy = rtc.getSizeY();
int dgz = rtc.getSizeZ();
Color[,,] colors = new Color[dgx, (dgy / bits), dgz];
for (int gx = 0; gx < dgx; gx++)
{
for (int gy = 0; gy < dgy / bits; gy++)
{
for (int gz = 0; gz < dgz; gz++)
{
int iv = 0;
for (int n = 0; n < bits; n++)
{
iv |= rtc.testBlock(gx, gy * bits + n, gz, RayCastBlockType.Opacity) ? (1 << n) : 0;
}
float a = iv / (float)((1 << bits) - 1);
colors[gx, gy, gz] = new Color(0, 0, 0, a);
}
}
}
int sizeX = colors.GetLength(0);
int sizeY = colors.GetLength(1);
int sizeZ = colors.GetLength(2);
Color[] rlt = new Color[sizeX * sizeY * sizeZ];
for (int x = 0; x < sizeX; x++)
{
for (int y = 0; y < sizeY; y++)
{
for (int z = 0; z < sizeZ; z++)
{
rlt[z * sizeY * sizeX + y * sizeX + x] = colors[x, y, z];
}
}
}
return(rlt);
}
public static RayCastResult rayTraceSmall(Vector3 startPos, DirInfo dirInfo, RayCastManager rtm, Face faceIn, float maxLength, RayCastBlockType mask)
{
int X = (int)(startPos.x + dirInfo.stepX * 0.0001f);
int Y = (int)(startPos.y + dirInfo.stepY * 0.0001f);
int Z = (int)(startPos.z + dirInfo.stepZ * 0.0001f);
float tMaxX = (dirInfo.stepX > 0 ? (1 - (startPos.x - X)) : (startPos.x - X)) * dirInfo.tDeltaX;//沿射线走多远才能跳到下一个X格
float tMaxY = (dirInfo.stepY > 0 ? (1 - (startPos.y - Y)) : (startPos.y - Y)) * dirInfo.tDeltaY;
float tMaxZ = (dirInfo.stepZ > 0 ? (1 - (startPos.z - Z)) : (startPos.z - Z)) * dirInfo.tDeltaZ;
int outSizeX = dirInfo.stepX > 0 ? rtm.getSizeX() : -1;
int outSizeY = dirInfo.stepY > 0 ? rtm.getSizeY() : -1;
int outSizeZ = dirInfo.stepZ > 0 ? rtm.getSizeZ() : -1;
while (true)
{
if (tMaxX < tMaxY)
{
if (tMaxX < tMaxZ)
{
X += dirInfo.stepX;
if (X == outSizeX)
{
return(new RayCastResult(false, X, Y, Z, dirInfo.stepX > 0 ? Face.FNI_x0 : Face.FNI_x1, tMaxX));
}
else
{
if (tMaxX > maxLength)
{
return(new RayCastResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxX));
}
else if (rtm.testBlock(X, Y, Z, mask))
{
return(new RayCastResult(true, X, Y, Z, dirInfo.stepX > 0 ? Face.FNI_x0 : Face.FNI_x1, tMaxX));
}
}
tMaxX += dirInfo.tDeltaX;
}
else
{
Z += dirInfo.stepZ;
if (Z == outSizeZ)
{
return(new RayCastResult(false, X, Y, Z, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
else
{
if (tMaxZ > maxLength)
{
return(new RayCastResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxZ));
}
else if (rtm.testBlock(X, Y, Z, mask))
{
return(new RayCastResult(true, X, Y, Z, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
}
tMaxZ += dirInfo.tDeltaZ;
}
}
else
{
if (tMaxY < tMaxZ)
{
Y += dirInfo.stepY;
if (Y == outSizeY)
{
return(new RayCastResult(false, X, Y, Z, dirInfo.stepY > 0 ? Face.FNI_y0 : Face.FNI_y1, tMaxY));
}
else
{
if (tMaxY > maxLength)
{
return(new RayCastResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxY));
}
else if (rtm.testBlock(X, Y, Z, mask))
{
return(new RayCastResult(true, X, Y, Z, dirInfo.stepY > 0 ? Face.FNI_y0 : Face.FNI_y1, tMaxY));
}
}
tMaxY += dirInfo.tDeltaY;
}
else
{
Z += dirInfo.stepZ;
if (Z == outSizeZ)
{
return(new RayCastResult(false, X, Y, Z, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
else
{
if (tMaxZ > maxLength)
{
return(new RayCastResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxZ));
}
else if (rtm.testBlock(X, Y, Z, mask))
{
return(new RayCastResult(true, X, Y, Z, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
}
tMaxZ += dirInfo.tDeltaZ;
}
}
}
}
