public bool IsIntersect(ref GeoRay2 dist, ref GeoInsectPointArrayInfo insect)
{
bool isInsect = GeoRayUtils.IsRayInsectAABB2(dist.mOrigin, dist.mDirection, mAABB2.mMin, mAABB2.mMax, ref insect);
if (isInsect)
{
insect.mHitObject2 = this;
insect.mLength = (GeoUtils.ToVector2(insect.mHitGlobalPoint.mPointArray[0]) - dist.mOrigin).magnitude;
}
return(isInsect);
}
public bool IsIntersect(ref GeoRay2 dist, ref GeoInsectPointArrayInfo insect)
{
GeoInsectPointInfo info = new GeoInsectPointInfo();
bool isInsect = GeoRayUtils.IsRayInsectSegment2(dist.mOrigin, dist.mDirection, mSeg.mP1, mSeg.mP2, ref info);
insect.mIsIntersect = isInsect;
if (isInsect)
{
insect.mHitObject2 = this;
insect.mHitGlobalPoint.mPointArray.Add(info.mHitGlobalPoint);
insect.mLength = (GeoUtils.ToVector2(info.mHitGlobalPoint) - dist.mOrigin).magnitude;
}
return(isInsect);
}
public bool IsIntersect(ref GeoRay2 dist, ref GeoInsectPointArrayInfo insect)
{
bool isInsect = GeoRayUtils.IsRayInsectTriangle2(dist.mOrigin, dist.mDirection, mP1, mP2, mP3, ref insect);
if (isInsect)
{
insect.mHitObject2 = this;
float min = 1e5f;
foreach (Vector3 v in insect.mHitGlobalPoint.mPointArray)
{
float len = (GeoUtils.ToVector2(v) - dist.mOrigin).magnitude;
if (len < min)
{
min = len;
}
}
insect.mLength = min;
}
return(isInsect);
}
public bool GetIntersection(GeoRay2 ray, ref GeoInsectPointArrayInfo intersection, bool occlusion)
{
if (mFlatTreeList.Count == 0)
{
return(false);
}
intersection.mIsIntersect = false;
intersection.mLength = 999999999.0f;
intersection.mHitObject2 = null;
int closer, other;
BVHTraversal[] todo = new BVHTraversal[64];
todo[0] = new BVHTraversal();
int stackptr = 0;
todo[stackptr].mIndex = 0;
todo[stackptr].mLength = -9999999.0f;
while (stackptr >= 0)
{
int ni = todo[stackptr].mIndex;
float near = todo[stackptr].mLength;
stackptr--;
BVHFlatNode2 node = mFlatTreeList[ni];
//if (near > intersection.mLength) // a bug here. may ignore closer object
// continue;
// 对叶节点做相交测试
if (node.mRightOffset == 0)
{
bool hit = false;
for (int o = 0; o < node.mLeafCount; ++o)
{
GeoInsectPointArrayInfo current = new GeoInsectPointArrayInfo();
BVHObject2 obj = mBuildPrims[(int)node.mStartIndex + o];
hit = obj.IsIntersect(ref ray, ref current);
if (hit)
{
if (occlusion)
{
intersection = current;
return(true);
}
if (current.mLength < intersection.mLength)
{
intersection = current;
}
}
}
}
else
{
closer = ni + 1;
other = ni + (int)node.mRightOffset;
// 对父结点做测试
GeoInsectPointArrayInfo in1 = new GeoInsectPointArrayInfo();
GeoInsectPointArrayInfo in2 = new GeoInsectPointArrayInfo();
bool hitc0 = GeoRayUtils.IsRayInsectAABB2(ray.mOrigin, ray.mDirection, mFlatTreeList[closer].mBox.mMin, mFlatTreeList[closer].mBox.mMax, ref in1);
bool hitc1 = GeoRayUtils.IsRayInsectAABB2(ray.mOrigin, ray.mDirection, mFlatTreeList[other].mBox.mMin, mFlatTreeList[other].mBox.mMax, ref in2);
if (hitc0 && hitc1)
{
Vector2 v1 = in1.mHitGlobalPoint[0];
Vector2 v2 = in2.mHitGlobalPoint[0];
float l1 = (v1 - ray.mOrigin).magnitude;
float l2 = (v2 - ray.mOrigin).magnitude;
if (l2 < l1) // 近的先处理，放在栈顶
{
todo[++stackptr] = new BVHTraversal(closer, l1);
todo[++stackptr] = new BVHTraversal(other, l2);
}
else
{
todo[++stackptr] = new BVHTraversal(other, l2);
todo[++stackptr] = new BVHTraversal(closer, l1);
}
}
else if (hitc0)
{
Vector2 v1 = in1.mHitGlobalPoint[0];
float l0 = (v1 - ray.mOrigin).magnitude;
todo[++stackptr] = new BVHTraversal(closer, l0);
}
else if (hitc1)
{
Vector2 v2 = in2.mHitGlobalPoint[0];
float l2 = (v2 - ray.mOrigin).magnitude;
todo[++stackptr] = new BVHTraversal(other, l2);
}
}
}
if (intersection.mHitObject2 != null)
{
intersection.mHitGlobalPoint.Clear();
intersection.mHitGlobalPoint.Add(ray.mOrigin + ray.mDirection * intersection.mLength);
}
return(intersection.mHitObject2 != null);
}
