コード例 #1
0
        public bool IsIntersect(ref GeoRay3 dist, ref GeoInsectPointArrayInfo insect)
        {
            bool isInsect = GeoRayUtils.IsRayInsectAABB2(dist.mOrigin, dist.mDirection, mAABB3.mMin, mAABB3.mMax, ref insect);

            if (isInsect)
            {
                insect.mHitObject2 = this;
                insect.mLength     = (insect.mHitGlobalPoint.mPointArray[0] - dist.mOrigin).magnitude;
            }
            return(isInsect);
        }
コード例 #2
0
        public bool IsIntersect(ref GeoRay3 dist, ref GeoInsectPointArrayInfo insect)
        {
            GeoInsectPointInfo info = new GeoInsectPointInfo();
            bool isInsect           = GeoRayUtils.IsRayInsectTriangle3(dist.mOrigin, dist.mDirection, mP1, mP2, mP3, ref info);

            if (isInsect)
            {
                insect.mHitObject2 = this;
                insect.mHitGlobalPoint.mPointArray.Add(info.mHitGlobalPoint);
                insect.mLength = (info.mHitGlobalPoint - dist.mOrigin).magnitude;
            }
            return(isInsect);
        }
コード例 #3
0
        public bool GetIntersection(GeoRay3 ray, ref GeoInsectPointArrayInfo intersection, bool occlusion)
        {
            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--;
                BVHFlatNode3 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();
                        BVHObject3 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.IsRayInsectAABB3(ray.mOrigin, ray.mDirection, mFlatTreeList[closer].mBox.mMin, mFlatTreeList[closer].mBox.mMax, ref in1);
                    bool hitc1 = GeoRayUtils.IsRayInsectAABB3(ray.mOrigin, ray.mDirection, mFlatTreeList[other].mBox.mMin, mFlatTreeList[other].mBox.mMax, ref in2);

                    if (hitc0 && hitc1)
                    {
                        float l0 = (in1.mHitGlobalPoint[0] - ray.mOrigin).magnitude;
                        float l2 = (in2.mHitGlobalPoint[0] - ray.mOrigin).magnitude;
                        if (l2 < l0)
                        {
                            float temp = l0;
                            l0 = l2;
                            l2 = temp;
                            int itemp = closer;
                            closer = other;
                            other  = itemp;
                        }
                        todo[++stackptr] = new BVHTraversal(other, l2);
                        todo[++stackptr] = new BVHTraversal(closer, l0);
                    }
                    else if (hitc0)
                    {
                        float l0 = (in1.mHitGlobalPoint[0] - ray.mOrigin).magnitude;
                        todo[++stackptr] = new BVHTraversal(closer, l0);
                    }
                    else if (hitc1)
                    {
                        float l2 = (in2.mHitGlobalPoint[0] - ray.mOrigin).magnitude;
                        todo[++stackptr] = new BVHTraversal(other, l2);
                    }
                }
            }
            if (intersection.mHitObject2 != null)
            {
                intersection.mHitGlobalPoint.Clear();
                intersection.mHitGlobalPoint.mPointArray.Add(ray.mOrigin + ray.mDirection * intersection.mLength);
                intersection.mIsIntersect = true;
            }
            return(intersection.mHitObject2 != null);
        }