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Diffstat (limited to 'silx/gui/plot3d/scene/utils.py')
| -rw-r--r-- | silx/gui/plot3d/scene/utils.py | 73 |
1 files changed, 1 insertions, 72 deletions
diff --git a/silx/gui/plot3d/scene/utils.py b/silx/gui/plot3d/scene/utils.py index 1224f5e..bddbcac 100644 --- a/silx/gui/plot3d/scene/utils.py +++ b/silx/gui/plot3d/scene/utils.py @@ -1,7 +1,7 @@ # coding: utf-8 # /*########################################################################## # -# Copyright (c) 2015-2018 European Synchrotron Radiation Facility +# Copyright (c) 2015-2019 European Synchrotron Radiation Facility # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal @@ -544,77 +544,6 @@ def segmentVolumeIntersect(segment, nbins): return bins -def segmentTrianglesIntersection(segment, triangles): - """Check for segment/triangles intersection. - - This is based on signed tetrahedron volume comparison. - - See A. Kensler, A., Shirley, P. - Optimizing Ray-Triangle Intersection via Automated Search. - Symposium on Interactive Ray Tracing, vol. 0, p33-38 (2006) - - :param numpy.ndarray segment: - Segment end points as a 2x3 array of coordinates - :param numpy.ndarray triangles: - Nx3x3 array of triangles - :return: (triangle indices, segment parameter, barycentric coord) - Indices of intersected triangles, "depth" along the segment - of the intersection point and barycentric coordinates of intersection - point in the triangle. - :rtype: List[numpy.ndarray] - """ - # TODO triangles from vertices + indices - # TODO early rejection? e.g., check segment bbox vs triangle bbox - segment = numpy.asarray(segment) - assert segment.ndim == 2 - assert segment.shape == (2, 3) - - triangles = numpy.asarray(triangles) - assert triangles.ndim == 3 - assert triangles.shape[1] == 3 - - # Test line/triangles intersection - d = segment[1] - segment[0] - t0s0 = segment[0] - triangles[:, 0, :] - edge01 = triangles[:, 1, :] - triangles[:, 0, :] - edge02 = triangles[:, 2, :] - triangles[:, 0, :] - - dCrossEdge02 = numpy.cross(d, edge02) - t0s0CrossEdge01 = numpy.cross(t0s0, edge01) - volume = numpy.sum(dCrossEdge02 * edge01, axis=1) - del edge01 - subVolumes = numpy.empty((len(triangles), 3), dtype=triangles.dtype) - subVolumes[:, 1] = numpy.sum(dCrossEdge02 * t0s0, axis=1) - del dCrossEdge02 - subVolumes[:, 2] = numpy.sum(t0s0CrossEdge01 * d, axis=1) - subVolumes[:, 0] = volume - subVolumes[:, 1] - subVolumes[:, 2] - intersect = numpy.logical_or( - numpy.all(subVolumes >= 0., axis=1), # All positive - numpy.all(subVolumes <= 0., axis=1)) # All negative - intersect = numpy.where(intersect)[0] # Indices of intersected triangles - - # Get barycentric coordinates - barycentric = subVolumes[intersect] / volume[intersect].reshape(-1, 1) - del subVolumes - - # Test segment/triangles intersection - volAlpha = numpy.sum(t0s0CrossEdge01[intersect] * edge02[intersect], axis=1) - t = volAlpha / volume[intersect] # segment parameter of intersected triangles - del t0s0CrossEdge01 - del edge02 - del volAlpha - del volume - - inSegmentMask = numpy.logical_and(t >= 0., t <= 1.) - intersect = intersect[inSegmentMask] - t = t[inSegmentMask] - barycentric = barycentric[inSegmentMask] - - # Sort intersecting triangles by t - indices = numpy.argsort(t) - return intersect[indices], t[indices], barycentric[indices] - - # Plane ####################################################################### class Plane(event.Notifier): |