public static bool IsOnSamePlane(GeoPointsArray3 points, ref GeoPlane plane)
{
if (points.Size() < 4)
{
return(true);
}
int count = points.Size();
int i = 2;
Vector3 p = points[0];
for (; i < count; ++i)
{
p = points[i];
if (!GeoLineUtils.IsPointInLine3(points[0], points[1], ref p))
{
break;
}
}
if (i == count)
{
return(true);
}
plane = GeoPlaneUtils.CreateFromTriangle(points[0], points[1], p);
i = 2;
int c = 2;
for (; i < count; ++i)
{
if (GeoPlaneUtils.IsPointOnPlane(plane.mNormal, plane.mD, points[i]))
{
c++;
}
}
return(c == count);
}
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);
}
// 两三角面 共面的情况
private static bool IsTriangleInsectTrianglePlane2(Vector3 p1, Vector3 p2, Vector3 p3, Vector3 p4, Vector3 p5, Vector3 p6, ref GeoInsectPointArrayInfo insect)
{
GeoPlane plane = GeoPlaneUtils.CreateFromTriangle(p1, p2, p3);
Vector2 p11, p21, p31, p41, p51, p61;
GeoPlaneUtils.PlaneTransformLocalTriangle(p1, p2, p3, plane, out p11, out p21, out p31);
GeoPlaneUtils.PlaneTransformLocalTriangle(p4, p5, p6, plane, out p41, out p51, out p61);
GeoInsectPointArrayInfo tmp = new GeoInsectPointArrayInfo();
bool isInsect = IsTriangleInsectTriangle2(p11, p21, p31, p41, p51, p61, ref tmp);
if (isInsect)
{
foreach (Vector3 v in tmp.mHitGlobalPoint.mPointArray)
{
Vector3 vt = new Vector3(v.x, 0.0f, v.z);
vt = plane.TransformToGlobal(vt);
insect.mHitGlobalPoint.mPointArray.Add(vt);
}
insect.mIsIntersect = insect.mHitGlobalPoint.mPointArray.Count > 0;
}
return(insect.mIsIntersect);
}