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 IsTriangleInsectCircle2(Vector2 p1, Vector2 p2, Vector2 p3, Vector2 center, float r, ref GeoInsectPointArrayInfo insect)
{
GeoInsectPointArrayInfo tmp = new GeoInsectPointArrayInfo();
if (GeoSegmentUtils.IsSegmentInsectCircle2(p1, p2, center, r, ref tmp))
{
insect.mHitGlobalPoint.mPointArray.AddRange(tmp.mHitGlobalPoint.mPointArray);
}
tmp.Clear();
if (GeoSegmentUtils.IsSegmentInsectCircle2(p3, p2, center, r, ref tmp))
{
insect.mHitGlobalPoint.mPointArray.AddRange(tmp.mHitGlobalPoint.mPointArray);
}
tmp.Clear();
if (GeoSegmentUtils.IsSegmentInsectCircle2(p1, p3, center, r, ref tmp))
{
insect.mHitGlobalPoint.mPointArray.AddRange(tmp.mHitGlobalPoint.mPointArray);
}
tmp.Clear();
return(false);
}
public static bool IsTriangleInsectSphere(Vector3 p1, Vector3 p2, Vector3 p3, Vector3 center, float r, ref GeoInsectPointArrayInfo insect)
{
GeoPlane plane = GeoPlaneUtils.CreateFromTriangle(p1, p2, p3);
bool isInsec = GeoPlaneUtils.IsPlaneInsectSphere(plane, center, r, ref insect);
if (isInsec)
{
Vector3 c1 = insect.mHitGlobalPoint.mPointArray[0];
float rad = insect.mHitGlobalPoint.mPointArray[0][0];
insect.Clear();
return(IsTriangleInsectPlaneCircle2(p1, p2, p3, c1, rad, plane, ref insect));
}
return(false);
}
