public static bool IsTriangleInsectCircle3(Vector3 p1, Vector3 p2, Vector3 p3, Vector3 center, float r, GeoPlane plane, ref GeoInsectPointArrayInfo insect)
{
bool isInsect = GeoPlaneUtils.IsPlaneInsectTriangle(plane.mNormal, plane.mD, p1, p2, p3, ref insect);
if (isInsect)
{
if (insect.mHitGlobalPoint.mPointArray.Count == 3) // 共面， 转化成 2d
{
insect.Clear();
return(IsTriangleInsectPlaneCircle2(p1, p2, p3, center, r, plane, ref insect));
}
else if (insect.mHitGlobalPoint.mPointArray.Count == 1)
{
if (GeoCircleUtils.IsInSphere(center, r, insect.mHitGlobalPoint.mPointArray[0]))
{
return(true);
}
}
else if (insect.mHitGlobalPoint.mPointArray.Count == 2)
{
Vector3 seg1 = plane.TransformToLocal(insect.mHitGlobalPoint.mPointArray[0]);
Vector3 seg2 = plane.TransformToLocal(insect.mHitGlobalPoint.mPointArray[1]);
Vector3 c1 = plane.TransformToLocal(center);
Vector2 p12 = new Vector2(seg1.x, seg1.z);
Vector2 p22 = new Vector2(seg2.x, seg2.z);
Vector2 c2 = new Vector2(c1.x, c1.z);
insect.Clear();
GeoInsectPointArrayInfo temp = new GeoInsectPointArrayInfo();
if (GeoSegmentUtils.IsSegmentInsectCircle2(p12, p22, c2, r, ref temp))
{
insect.mIsIntersect = true;
foreach (Vector3 v in temp.mHitGlobalPoint.mPointArray)
{
Vector3 vv = new Vector3(v.x, 0.0f, v.y);
vv = plane.TransformToGlobal(vv);
insect.mHitGlobalPoint.mPointArray.Add(vv);
}
return(true);
}
}
}
return(false);
}
public static bool IsTriangleInsectTriangle3(Vector3 p1, Vector3 p2, Vector3 p3, Vector3 p4, Vector3 p5, Vector3 p6, ref GeoInsectPointArrayInfo insect)
{
/*
* // 外面进行 剔除 处理
* Vector3 min1 = Vector3.Min(p1, p2);
* min1 = Vector3.Min(min1, p3);
* Vector3 max1 = Vector3.Max(p1, p2);
* max1 = Vector3.Max(max1, p3);
* Vector3 min2 = Vector3.Min(p4, p5);
* min2 = Vector3.Min(min2, p6);
* Vector3 max2 = Vector3.Max(p4, p5);
* max2 = Vector3.Max(max2, p6);
* if (!GeoAABBUtils.IsAABBInsectAABB3(min1, max1, min2, max2))
* {
* return false;
* }
*/
// 417
Vector3 p12 = p2 - p1;
Vector3 p13 = p3 - p1;
Vector3 normal1 = Vector3.Cross(p12, p13);
Vector3 p45 = p5 - p4;
Vector3 p46 = p6 - p4;
Vector3 normal2 = Vector3.Cross(p45, p46);
normal1.Normalize();
normal2.Normalize();
float dot = Vector3.Dot(normal1, normal2);
if (1 - Mathf.Abs(dot) < 1e-5f) // 共面
{
return(IsTriangleInsectTrianglePlane2(p1, p2, p3, p4, p5, p6, ref insect));
}
float d1 = -Vector3.Dot(normal1, p1);
float d2 = -Vector3.Dot(normal2, p4);
GeoInsectPointArrayInfo temp1 = new GeoInsectPointArrayInfo();
if (GeoPlaneUtils.IsPlaneInsectTriangle(normal1, d1, p4, p5, p6, ref temp1))
{
GeoInsectPointArrayInfo temp2 = new GeoInsectPointArrayInfo();
if (GeoPlaneUtils.IsPlaneInsectTriangle(normal2, d2, p1, p2, p3, ref temp2))
{
int count1 = temp1.mHitGlobalPoint.mPointArray.Count;
int count2 = temp2.mHitGlobalPoint.mPointArray.Count;
if (count1 == 1 && count2 == 1)
{
bool isEq = temp1.mHitGlobalPoint.mPointArray[0] == temp2.mHitGlobalPoint.mPointArray[0];
if (isEq)
{
insect.mIsIntersect = true;
insect.mHitGlobalPoint.mPointArray.Add(temp1.mHitGlobalPoint.mPointArray[0]);
return(true);
}
}
else if (count1 == 2 && count2 == 2)
{
Vector3 s1 = temp1.mHitGlobalPoint.mPointArray[0];
Vector3 s2 = temp1.mHitGlobalPoint.mPointArray[1];
Vector3 s3 = temp2.mHitGlobalPoint.mPointArray[0];
Vector3 s4 = temp2.mHitGlobalPoint.mPointArray[1];
GeoSegmentUtils.IsSegmentOverlapSegment3(s1, s2, s3, s4, ref insect);
}
}
}
return(insect.mIsIntersect);
}
