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); }