bool is_back_facing(int tid) { Vector3d n = PreviewMesh.GetTriNormal(tid); Vector3d c = PreviewMesh.GetTriCentroid(tid); return((c - cameraFrameL.Origin).Dot(n) > -0.1); }
public bool FindHitTriangle(Ray3f sceneRay, bool snap_to_center, ref Frame3f hitFrameS, ref int hitTID) { Ray3f objRay = SceneTransforms.SceneToObject(Target, sceneRay); hitTID = PreviewSpatial.FindNearestHitTriangle(objRay); if (hitTID == DMesh3.InvalidID) { return(false); } if (allow_backface_hits == false && is_back_facing(hitTID)) { return(false); } var intr = MeshQueries.TriangleIntersection(PreviewMesh, hitTID, objRay); if (snap_to_center) { Frame3f hitFrameL = new Frame3f(PreviewMesh.GetTriCentroid(hitTID), PreviewMesh.GetTriNormal(hitTID)); hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL); } else { Vector3f hitPoint = objRay.PointAt((float)intr.RayParameter); Frame3f hitFrameL = new Frame3f(hitPoint, PreviewMesh.GetTriNormal(hitTID)); hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL); } return(true); }
public bool FindHitEdge(Ray3f sceneRay, MeshEditorOpType.BoundaryType boundaryMode, bool snap_to_center, ref Frame3f hitFrameS, ref int hitEID) { Ray3f objRay = SceneTransforms.SceneToObject(Target, sceneRay); int hit_tri = PreviewSpatial.FindNearestHitTriangle(objRay); if (hit_tri == DMesh3.InvalidID) { return(false); } if (allow_backface_hits == false && is_back_facing(hit_tri)) { return(false); } var intr = MeshQueries.TriangleIntersection(PreviewMesh, hit_tri, objRay); int e_idx = -1; double near_sqr = double.MaxValue; DistRay3Segment3 near_dist = null; for (int j = 0; j < 3; ++j) { Segment3d seg = new Segment3d(intr.Triangle[j], intr.Triangle[(j + 1) % 3]); DistRay3Segment3 dist = new DistRay3Segment3(objRay, seg); if (dist.GetSquared() < near_sqr) { near_sqr = dist.GetSquared(); near_dist = dist; e_idx = j; } } int eid = PreviewMesh.GetTriEdge(hit_tri, e_idx); if (boundaryMode != MeshEditorOpType.BoundaryType.Any) { bool is_boundary = PreviewMesh.IsBoundaryEdge(eid); if ((is_boundary && boundaryMode == MeshEditorOpType.BoundaryType.OnlyInternal) || (is_boundary == false && boundaryMode == MeshEditorOpType.BoundaryType.OnlyBoundary)) { return(false); } } if (snap_to_center) { Frame3f hitFrameL = new Frame3f(PreviewMesh.GetEdgePoint(eid, 0.5), PreviewMesh.GetTriNormal(hit_tri)); hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL); } else { Frame3f hitFrameL = new Frame3f(near_dist.SegmentClosest, PreviewMesh.GetTriNormal(hit_tri)); hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL); } hitEID = eid; return(true); }
public bool FindHitVertex(Ray3f sceneRay, MeshEditorOpType.BoundaryType boundaryMode, ref Frame3f hitFrameS, ref int hitVID) { Ray3f objRay = SceneTransforms.SceneToObject(Target, sceneRay); int hit_tri = PreviewSpatial.FindNearestHitTriangle(objRay); if (hit_tri == DMesh3.InvalidID) { return(false); } if (allow_backface_hits == false && is_back_facing(hit_tri)) { return(false); } Index3i vt = PreviewMesh.GetTriangle(hit_tri); hitVID = -1; double near_sqr = double.MaxValue; for (int j = 0; j < 3; ++j) { Vector3f v = (Vector3f)PreviewMesh.GetVertex(vt[j]); if (objRay.DistanceSquared(v) < near_sqr) { near_sqr = objRay.DistanceSquared(v); hitVID = vt[j]; } } if (boundaryMode != MeshEditorOpType.BoundaryType.Any) { bool is_boundary = PreviewMesh.IsBoundaryVertex(hitVID); if ((is_boundary && boundaryMode == MeshEditorOpType.BoundaryType.OnlyInternal) || (is_boundary == false && boundaryMode == MeshEditorOpType.BoundaryType.OnlyBoundary)) { return(false); } } Frame3f hitFrameL = new Frame3f(PreviewMesh.GetVertex(hitVID), PreviewMesh.GetTriNormal(hit_tri)); hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL); return(true); }